4xxi

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Details

Founded:
2008
Hourly Rates:
$50 - $99 / hr
Employees:
50 - 249
Avg. Project Cost:
$10,000+
Ratings:
4.3 9 Reviews

Services

  • Mobile App Development
  • Web Development
  • VR App Development
  • Mobile App Design
  • App Marketing
  • Supply Chain Blockchain

Industries Served

Fashion & Apparel Sports & Fitness Financial Services Education Advertising & Marketing Manufacturing Media & Entertainment Insurance Legal Services

Where We Specialize

25% Software Development
Software Development 25%
AI Development 23%
IT Services 23%
Bot Development 13%
TypeScript 13%
Mobile App Development 3%

Industry Expertise

Real Estate100%

Typical Project Size

52% Enterprise
32% Small Business
16% Midmarket Business

About

Since 2008, 4xxi has operated as a technology services provider. Their core services include Mobile App Development. 4xxi employs 50 - 249 people. Typical hourly rates run around $50 - $99 / hr/hr, with an average project cost near $50,000. Clients have rated 4xxi 4.9 out of 5 in 13 reviews. The team is based in London, England. This gives a quick snapshot of what to expect when working with 4xxi.

4xxi Reviews

4.3 9 Reviews
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Professional Mobile App Development Team, Smooth Delivery From Start to Finish

Bec Nguyen / IT Manager | Oct 12, 2026

4xxi did an excellent job for us. Communication was consistent. We had a weekly call, a shared Slack channel and a project board we could check at any time. They shared working builds regularly, so we could test early and give feedback before things were locked in. Even with the time zone difference, responses usually came the same day and we never felt left in the dark.

We launched on schedule and have not had any major issues since. If you need a team that communicates well and delivers, they are a good choice.

Project summary

We engaged 4xxi to build iOS and Android apps for our customers, including booking, payments and push notifications. Their team handled planning, development and QA, with our product owner signing off each milestone. We worked together for around 3 months.

  • Overall Rating 4.5
  • Quality 4.0
  • Schedule 5.0
  • Project Cost 4.5
  • Willing To Refer 5.0
Project Type:
Mobile App Development
Project Cost:
$50,000 to $149,999
Project Duration:
Jun 2026 - Sep 2026
Business Type:
Fashion & Apparel
Location:
Gold Coast, Australia

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I'm the IT Manager at Horizon Clothing Pty Ltd, a Fashion & Apparel company based in Gold Coast, Australia. I look after our technology and work closely with outside partners on bigger projects.
What specific problem or business challenge led you to hire this company?
We had tried to do this internally and it stalled. We needed specialists to build iOS and Android apps for our customers, including booking, payments and push notifications.
What services did the company provide for your project?
End-to-end Mobile App Development — from requirements and design through to deployment and a support period afterwards.
Why did you choose this company over other providers you considered?
Their pricing was fair and they were honest about timelines instead of just telling us what we wanted to hear.
How clearly did the company understand your requirements and business goals?
Well. There were a couple of points we had to clarify early on, but after that they were spot on.
How was your overall experience with their communication and project management?
Good. Weekly calls, regular updates and a shared board meant we always knew where things stood.
Did the company deliver the project on time and within your expected budget?
Yes. The only extra cost came from features we added ourselves, and they quoted those fairly.
What tangible results or business impact have you seen since the project was completed?
It is still early, but the numbers are trending in the right direction and the system has been stable.
What did you like most about working with this company?
The consistency. Same team, same standard, from the first week to the last.
Would you recommend this company to others, and would you work with them again?
Yes. They are a reliable Mobile App Development partner.

They listened, asked the right questions, and delivered

Kevin Coleman / Chief Digital Officer | Sep 16, 2026

We were very happy with how this project went. They shared working builds regularly, so we could test early and give feedback before things were locked in. We dealt with the same core team throughout, so we did not have to keep re-explaining things. Even with the time zone difference, responses usually came the same day and we never felt left in the dark.

Since launch, everything has been stable and our team has adapted to it quickly. Overall, a team we trust and plan to keep working with.

Project summary

We hired 4xxi to rebuild our existing mobile app, which had poor reviews and frequent crashes. The work covered requirements, design, development, testing and launch support. The project took roughly 2 months from kickoff to launch.

  • Overall Rating 5.0
  • Quality 5.0
  • Schedule 5.0
  • Project Cost 5.0
  • Willing To Refer 5.0
Project Type:
Mobile App Development
Project Cost:
$500,000+
Project Duration:
May 2026 - Jul 2026
Business Type:
Sports & Fitness
Location:
Seattle, USA

Questions & Answers

Please describe your company, your role, and the industry you operate in.
Nimbus Sports is a Sports & Fitness business in Seattle, USA. As Chief Digital Officer, I was responsible for this project on our side and the main contact for 4xxi.
What specific problem or business challenge led you to hire this company?
We had tried to do this internally and it stalled. We needed specialists to rebuild our existing mobile app, which had poor reviews and frequent crashes.
What services did the company provide for your project?
End-to-end Mobile App Development — from requirements and design through to deployment and a support period afterwards.
Why did you choose this company over other providers you considered?
They had relevant experience in Sports & Fitness and their proposal was the clearest of the ones we received.
How clearly did the company understand your requirements and business goals?
They understood our goals quickly, partly because they had worked with Sports & Fitness clients before.
How was your overall experience with their communication and project management?
Organised and transparent. Their project manager kept the project on track and flagged risks early.
Did the company deliver the project on time and within your expected budget?
Yes, on time and within budget.
What tangible results or business impact have you seen since the project was completed?
It is still early, but the numbers are trending in the right direction and the system has been stable.
What did you like most about working with this company?
That they were proactive — they suggested improvements instead of just doing what was asked.
Would you recommend this company to others, and would you work with them again?
Yes, I would recommend them and we plan to work with them again.

Great Experience With 4xxi on Our IT Managed Services Project

Andre Price / Founder | Sep 16, 2026

The project went well overall. They took the time to understand our business before suggesting anything, which we appreciated after previous agencies jumped straight into building. Communication was consistent. We had a weekly call, a shared Slack channel and a project board we could check at any time. They shared working builds regularly, so we could test early and give feedback before things were locked in.

The IT Managed Services work has already made a noticeable difference — tasks that used to take hours now take minutes. Estimates on a few features were optimistic and those took longer than planned. Happy to recommend them.

Project summary

We partnered with 4xxi to manage our servers, backups and helpdesk. Their team handled planning, development and QA, with our product owner signing off each milestone. The engagement ran for about 9 months.

  • Overall Rating 4.0
  • Quality 3.5
  • Schedule 4.5
  • Project Cost 4.0
  • Willing To Refer 5.0
Project Type:
IT Managed Services
Project Cost:
$10,000 to $49,999
Project Duration:
Oct 2025 - Jul 2026
Business Type:
Financial Services
Location:
Dallas, USA

Questions & Answers

Please describe your company, your role, and the industry you operate in.
Evergreen Capital is a Financial Services business in Dallas, USA. As Founder, I was responsible for this project on our side and the main contact for 4xxi.
What specific problem or business challenge led you to hire this company?
Our team was spending too much time on manual work. The goal was to manage our servers, backups and helpdesk so they could focus on customers.
What services did the company provide for your project?
IT Managed Services, including planning, development, testing and launch support.
Why did you choose this company over other providers you considered?
They had relevant experience in Financial Services and their proposal was the clearest of the ones we received.
How clearly did the company understand your requirements and business goals?
Very well. They asked a lot of questions upfront and turned our rough ideas into a clear plan.
How was your overall experience with their communication and project management?
Good. Weekly calls, regular updates and a shared board meant we always knew where things stood.
Did the company deliver the project on time and within your expected budget?
It was delivered on time, and the final invoice matched the original estimate.
What tangible results or business impact have you seen since the project was completed?
Our team saves several hours a week, and we have had very few issues since launch.
What did you like most about working with this company?
The consistency. Same team, same standard, from the first week to the last.
Would you recommend this company to others, and would you work with them again?
Yes, I've already recommended them to a couple of people I know.

Capable AI & Machine Learning team — happy with the end result

Nora Al Qahtani / Co-Founder & CTO | May 17, 2026

The final product works well for us, although the process could have been smoother. The developers were knowledgeable and made a few suggestions that ended up saving us time and money. Even with the time zone difference, responses usually came the same day and we never felt left in the dark.

Feedback from our customers has been very positive so far. Their team changed one developer midway, which slowed things down for a couple of weeks.

I would recommend 4xxi to anyone looking for a dependable AI & Machine Learning partner.

Project summary

We partnered with 4xxi to build a demand forecasting model on top of our sales data. Scope included discovery workshops, development in two-week sprints and a short support period after launch. We worked together for around 3 months.

  • Overall Rating 3.5
  • Quality 3.5
  • Schedule 3.5
  • Project Cost 3.5
  • Willing To Refer 5.0
Project Type:
AI & Machine Learning
Project Cost:
Less than $10,000
Project Duration:
Jan 2026 - Apr 2026
Business Type:
Education
Location:
Riyadh, Saudi Arabia

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I work as Co-Founder & CTO at Swift Learning. We operate in Education and most of our customers are in and around Riyadh, Saudi Arabia.
What specific problem or business challenge led you to hire this company?
We had tried to do this internally and it stalled. We needed specialists to build a demand forecasting model on top of our sales data.
What services did the company provide for your project?
End-to-end AI & Machine Learning — from requirements and design through to deployment and a support period afterwards.
Why did you choose this company over other providers you considered?
They had relevant experience in Education and their proposal was the clearest of the ones we received.
How clearly did the company understand your requirements and business goals?
Better than we expected. They pointed out a few things we had not thought about.
How was your overall experience with their communication and project management?
Very responsive. We usually heard back the same day, even with the time difference.
Did the company deliver the project on time and within your expected budget?
Yes, on time and within budget.
What tangible results or business impact have you seen since the project was completed?
Customer feedback has been positive, and we have seen better engagement since going live.
What did you like most about working with this company?
That they were proactive — they suggested improvements instead of just doing what was asked.
Would you recommend this company to others, and would you work with them again?
Definitely. We have already started talking about the next phase.

Reliable Mobile App Development Partner That Delivered What They Promised

Pooja Desai / Head of Digital | May 13, 2026

Our experience with 4xxi was really positive from start to finish. They shared working builds regularly, so we could test early and give feedback before things were locked in. We dealt with the same core team throughout, so we did not have to keep re-explaining things.

Since launch, everything has been stable and our team has adapted to it quickly. I would recommend 4xxi to anyone looking for a dependable Mobile App Development partner.

Project summary

We engaged 4xxi to develop a field-staff app with offline mode that syncs back to our main system. They worked alongside our in-house team, which mostly handled business requirements and testing. Overall it was a 2-month engagement.

  • Overall Rating 4.5
  • Quality 5.0
  • Schedule 4.5
  • Project Cost 4.5
  • Willing To Refer 5.0
Project Type:
Mobile App Development
Project Cost:
$50,000 to $149,999
Project Duration:
Jan 2026 - Mar 2026
Business Type:
Advertising & Marketing
Location:
Ahmedabad, India

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I'm the Head of Digital at Trueline Marketing Pvt Ltd, a Advertising & Marketing company based in Ahmedabad, India. I look after our technology and work closely with outside partners on bigger projects.
What specific problem or business challenge led you to hire this company?
Our team was spending too much time on manual work. The goal was to develop a field-staff app with offline mode that syncs back to our main system so they could focus on customers.
What services did the company provide for your project?
Mobile App Development, including planning, development, testing and launch support.
Why did you choose this company over other providers you considered?
We compared three or four agencies. 4xxi asked the best questions and had good reviews from past clients.
How clearly did the company understand your requirements and business goals?
Well. There were a couple of points we had to clarify early on, but after that they were spot on.
How was your overall experience with their communication and project management?
Organised and transparent. Their project manager kept the project on track and flagged risks early.
Did the company deliver the project on time and within your expected budget?
Yes, on time and within budget.
What tangible results or business impact have you seen since the project was completed?
We can now handle more volume without adding staff, which was the main goal.
What did you like most about working with this company?
The consistency. Same team, same standard, from the first week to the last.
Would you recommend this company to others, and would you work with them again?
Definitely. We have already started talking about the next phase.

Skilled AI & Machine Learning Team That Understood Our Business

Rohan Iyer / Founder & CEO | Apr 29, 2026

The project went well overall. Communication was consistent. We had a weekly call, a shared Slack channel and a project board we could check at any time. The developers were knowledgeable and made a few suggestions that ended up saving us time and money. We dealt with the same core team throughout, so we did not have to keep re-explaining things.

It has made a real difference to how our team works day to day. There were some early misunderstandings on requirements that took a few rounds to sort out. Happy to recommend them.

Project summary

Our company worked with 4xxi to automate document data extraction that our team was doing by hand. The project was split into milestones, with a working build shared at the end of each one. We worked together for around 2 months.

  • Overall Rating 4.0
  • Quality 3.5
  • Schedule 4.0
  • Project Cost 3.5
  • Willing To Refer 5.0
Project Type:
AI & Machine Learning
Project Cost:
$50,000 to $149,999
Project Duration:
Feb 2026 - Apr 2026
Business Type:
Manufacturing
Location:
Pune, India

Questions & Answers

Please describe your company, your role, and the industry you operate in.
Sage Manufacturing Pvt Ltd is a Manufacturing business in Pune, India. As Founder & CEO, I was responsible for this project on our side and the main contact for 4xxi.
What specific problem or business challenge led you to hire this company?
We had tried to do this internally and it stalled. We needed specialists to automate document data extraction that our team was doing by hand.
What services did the company provide for your project?
End-to-end AI & Machine Learning — from requirements and design through to deployment and a support period afterwards.
Why did you choose this company over other providers you considered?
We compared three or four agencies. 4xxi asked the best questions and had good reviews from past clients.
How clearly did the company understand your requirements and business goals?
They understood our goals quickly, partly because they had worked with Manufacturing clients before.
How was your overall experience with their communication and project management?
Organised and transparent. Their project manager kept the project on track and flagged risks early.
Did the company deliver the project on time and within your expected budget?
Mostly. One milestone slipped by about a week, but the final delivery was on schedule and the budget held.
What tangible results or business impact have you seen since the project was completed?
Customer feedback has been positive, and we have seen better engagement since going live.
What did you like most about working with this company?
That they were proactive — they suggested improvements instead of just doing what was asked.
Would you recommend this company to others, and would you work with them again?
Yes, I've already recommended them to a couple of people I know.

Exceeded our expectations on quality and communication

Stephanie Coleman / Founder & CEO | Apr 26, 2026

I would rate this engagement highly on almost every front. The developers were knowledgeable and made a few suggestions that ended up saving us time and money. When we changed our minds on a couple of features halfway through, they handled it without fuss and were clear about the impact on cost and timeline. They shared working builds regularly, so we could test early and give feedback before things were locked in.

Since launch, everything has been stable and our team has adapted to it quickly. If you need a team that communicates well and delivers, they are a good choice.

Project summary

Our company worked with 4xxi to provide ongoing monitoring and support for our cloud infrastructure. They also took care of integrations with a couple of third-party tools we already used. The engagement ran for about 7 months.

  • Overall Rating 4.5
  • Quality 4.5
  • Schedule 4.5
  • Project Cost 5.0
  • Willing To Refer 5.0
Project Type:
IT Managed Services
Project Cost:
Less than $10,000
Project Duration:
Jul 2025 - Feb 2026
Business Type:
Media & Entertainment
Location:
Minneapolis, USA

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I work as Founder & CEO at Beacon Entertainment. We operate in Media & Entertainment and most of our customers are in and around Minneapolis, USA.
What specific problem or business challenge led you to hire this company?
We needed to provide ongoing monitoring and support for our cloud infrastructure, and we didn't have the in-house capacity to do it ourselves.
What services did the company provide for your project?
Mainly IT Managed Services. They also helped with the technical planning and a few integrations with our existing tools.
Why did you choose this company over other providers you considered?
Their pricing was fair and they were honest about timelines instead of just telling us what we wanted to hear.
How clearly did the company understand your requirements and business goals?
They understood our goals quickly, partly because they had worked with Media & Entertainment clients before.
How was your overall experience with their communication and project management?
Very responsive. We usually heard back the same day, even with the time difference.
Did the company deliver the project on time and within your expected budget?
Yes. The only extra cost came from features we added ourselves, and they quoted those fairly.
What tangible results or business impact have you seen since the project was completed?
Customer feedback has been positive, and we have seen better engagement since going live.
What did you like most about working with this company?
The consistency. Same team, same standard, from the first week to the last.
Would you recommend this company to others, and would you work with them again?
Yes, I would recommend them and we plan to work with them again.

Solid delivery, though timelines needed some pushing

Sara Rahman / Co-Founder | Feb 20, 2026

The final product works well for us, although the process could have been smoother. The developers were knowledgeable and made a few suggestions that ended up saving us time and money. We dealt with the same core team throughout, so we did not have to keep re-explaining things.

The Software Development work has already made a noticeable difference — tasks that used to take hours now take minutes. A couple of milestones slipped by a week or so, mostly around testing. I would recommend 4xxi to anyone looking for a dependable Software Development partner.

Project summary

We engaged 4xxi to build a custom operations platform to replace the spreadsheets and email threads we were running the business on. The work covered requirements, design, development, testing and launch support. The engagement ran for about 3 months.

  • Overall Rating 3.5
  • Quality 4.0
  • Schedule 3.5
  • Project Cost 3.5
  • Willing To Refer 5.0
Project Type:
Software Development
Project Cost:
$150,000 to $499,999
Project Duration:
Oct 2025 - Jan 2026
Business Type:
Insurance
Location:
Abu Dhabi, UAE

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We're a mid-sized Insurance company based in Abu Dhabi, UAE. I'm the Co-Founder and I oversaw the project from start to finish.
What specific problem or business challenge led you to hire this company?
Our existing setup was holding us back. We wanted to build a custom operations platform to replace the spreadsheets and email threads we were running the business on before our busy season.
What services did the company provide for your project?
End-to-end Software Development — from requirements and design through to deployment and a support period afterwards.
Why did you choose this company over other providers you considered?
They had relevant experience in Insurance and their proposal was the clearest of the ones we received.
How clearly did the company understand your requirements and business goals?
Better than we expected. They pointed out a few things we had not thought about.
How was your overall experience with their communication and project management?
Good. Weekly calls, regular updates and a shared board meant we always knew where things stood.
Did the company deliver the project on time and within your expected budget?
It was delivered on time, and the final invoice matched the original estimate.
What tangible results or business impact have you seen since the project was completed?
We can now handle more volume without adding staff, which was the main goal.
What did you like most about working with this company?
The consistency. Same team, same standard, from the first week to the last.
Would you recommend this company to others, and would you work with them again?
Yes, I would recommend them and we plan to work with them again.

Great Experience With 4xxi on Our Mobile App Development Project

Julia Fischer / Managing Director | Feb 08, 2026

I would rate this engagement highly on almost every front. Their project manager kept things organised and was quick to flag anything that might affect the timeline. Even with the time zone difference, responses usually came the same day and we never felt left in the dark. We dealt with the same core team throughout, so we did not have to keep re-explaining things.

We are already seeing better numbers than before the project. We would definitely work with them again.

Project summary

4xxi was brought in to develop a field-staff app with offline mode that syncs back to our main system. Scope included discovery workshops, development in two-week sprints and a short support period after launch. The engagement ran for about 3 months.

  • Overall Rating 5.0
  • Quality 5.0
  • Schedule 4.5
  • Project Cost 5.0
  • Willing To Refer 5.0
Project Type:
Mobile App Development
Project Cost:
Less than $10,000
Project Duration:
Sep 2025 - Dec 2025
Business Type:
Legal Services
Location:
Hamburg, Germany

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I'm the Managing Director at Atlas Partners GmbH, a Legal Services company based in Hamburg, Germany. I look after our technology and work closely with outside partners on bigger projects.
What specific problem or business challenge led you to hire this company?
We needed to develop a field-staff app with offline mode that syncs back to our main system, and we didn't have the in-house capacity to do it ourselves.
What services did the company provide for your project?
Mobile App Development, plus QA and some consulting on how to structure the project.
Why did you choose this company over other providers you considered?
Their pricing was fair and they were honest about timelines instead of just telling us what we wanted to hear.
How clearly did the company understand your requirements and business goals?
Very well. They asked a lot of questions upfront and turned our rough ideas into a clear plan.
How was your overall experience with their communication and project management?
Communication was good overall and improved further once we settled into a routine.
Did the company deliver the project on time and within your expected budget?
It was delivered on time, and the final invoice matched the original estimate.
What tangible results or business impact have you seen since the project was completed?
We can now handle more volume without adding staff, which was the main goal.
What did you like most about working with this company?
That they were proactive — they suggested improvements instead of just doing what was asked.
Would you recommend this company to others, and would you work with them again?
Yes, I would recommend them and we plan to work with them again.
FAQ

Frequently Asked Questions

Got questions about our specialized technology solutions? We have the answers to help you make informed decisions.

4xxi has delivered projects across a range of different industries, including Education, Travel & Hospitality, Logistics & Supply Chain, Fashion & Apparel, Pharmaceuticals & Biotechnology and Nonprofit & NGO.

Generally, yes — companies like 4xxi tend to work well with startups because of what they typically offer: MVP builds, product strategy input, architecture that can scale later, and dedicated teams that keep costs manageable while still moving fast. For context, it has experience across industries such as Education, Travel & Hospitality, Logistics & Supply Chain, Fashion & Apparel, Pharmaceuticals & Biotechnology and Nonprofit & NGO, and it reports a team size of 50 - 249 professionals.

The exact stack shifts by project, but 4xxi commonly works across things like React, Angular, Vue.js, Node.js, Python, .NET, Java, PHP, Flutter, React Native, native iOS and Android, and cloud platforms like AWS and Azure. For context, its listed capabilities span Mobile App Design, VR App Development, Supply Chain Blockchain, App Marketing and Web Development, and it reports a team size of 50 - 249 professionals.

It depends heavily on scope. A lean MVP might be a matter of weeks, while a full enterprise system or a larger digital transformation project can stretch into months once you factor in development, testing, and deployment. With a team of 50 - 249 professionals, 4xxi can scale resources based on project urgency.

When you're weighing up a software partner such as 4xxi, it's worth looking past the pitch and checking the portfolio, what past clients say, relevant industry background, technical range, how they communicate, pricing structure, project management style, and what support looks like after launch. For context, its listed capabilities span Mobile App Design, VR App Development, Supply Chain Blockchain, App Marketing and Web Development, and its typical hourly rate is around $50 - $99.

That depends on where 4xxi is based and who they primarily serve — some firms like this operate fully offshore, some are local-first, and plenty run a hybrid model that mixes both. For context, it has experience across industries such as Education, Travel & Hospitality, Logistics & Supply Chain, Fashion & Apparel, Pharmaceuticals & Biotechnology and Nonprofit & NGO, and its listed capabilities span Mobile App Design, VR App Development, Supply Chain Blockchain, App Marketing and Web Development.

Usually, yes — a dedicated developer arrangement is a common option with firms like 4xxi, where you get engineers working exclusively on your project as an extension of your in-house team rather than as a separate outsourced unit. For context, it has experience across industries such as Education, Travel & Hospitality, Logistics & Supply Chain, Fashion & Apparel, Pharmaceuticals & Biotechnology and Nonprofit & NGO, and it has been operating since 2008.

Plenty of modern software teams, 4xxi included, now build real AI and machine learning features — chatbots, predictive models, computer vision, and automation that goes beyond simple rule-based scripts. For context, it has experience across industries such as Education, Travel & Hospitality, Logistics & Supply Chain, Fashion & Apparel, Pharmaceuticals & Biotechnology and Nonprofit & NGO, and its typical hourly rate is around $50 - $99.

The most reliable route is giving 4xxi a clear, specific brief up front — through their website form, a direct email, or a call — since a vague ask tends to get a vague answer back, while a concrete one usually gets a proper estimate. For context, its listed capabilities span Mobile App Design, VR App Development, Supply Chain Blockchain, App Marketing and Web Development, and it has experience across industries such as Education, Travel & Hospitality, Logistics & Supply Chain, Fashion & Apparel, Pharmaceuticals & Biotechnology and Nonprofit & NGO.
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