Details
| Founded: | 2014 |
|---|---|
| Hourly Rates: | $100 - $149 |
| Employees: | 10 - 49 |
| Avg. Project Cost: | $100,000+ |
| Ratings: |
4.2
8 Reviews
|
Industries Served
About
NotionTheory is a mobile app development company that produces the best service. They always try to work collaboratively with clients to make various mobile apps & solutions that discuss particular enterprise challenges. They know the best process to convert your dream into presence for websites as well as mobile applications. They produce results in time & for individual prices, using digital technologies for amazing user experience.
NotionTheory Reviews
Sensor network and the analytics layer on top were both handled by people who understood each half
Hamish Bellamy / GM of Technology | May 23, 2026I went into this engagement genuinely skeptical. A previous vendor had left us with a system that technically worked but that nobody trusted, and I wasn't interested in repeating that experience. This team earned trust the slow way — solid discovery documentation, technical proposals that held up under scrutiny, sprints that landed when promised, and ultimately a production system that has simply behaved. I don't open conversations about them with caveats anymore.
Project summary
A merger left us running two incompatible student information systems. We needed a consolidation plan that kept historical records intact and didn't interrupt term-time operations.
| 4.0 Overall Rating |
| 4.5 Quality |
| 4.0 Schedule |
| 4.5 Project Cost |
| 5.0 Willing To Refer |
| Project Type: | IoT Development |
|---|---|
| Project Cost: | $10,000 to $49,999 |
| Project Duration: | Jul 2025 - Apr 2026 |
| Business Type: | Education |
|---|---|
| Location: | Melbourne, Australia |
Questions & Answers
Core Web Vitals scores validated every performance decision they pushed us to make
Griffin Ashcombe / Managing Director, Tech | May 03, 2026This was our fourth agency in three years, and I say that with some embarrassment. Every previous engagement had looked promising on paper and fallen apart somewhere in delivery. What was different here was the sequencing: they spent real time understanding the actual problem before proposing anything, rather than pattern-matching to a solution they already knew how to sell. The build ran to schedule, our own engineers had genuinely positive things to say during handover, and four months into live operation we haven't had a single critical incident. We're already talking about the next phase with them.
Project summary
A previous project had worked fine in staging and fallen apart in production. We approached vendor selection this time with a lot more scrutiny as a direct result.
| 4.5 Overall Rating |
| 5.0 Quality |
| 4.5 Schedule |
| 4.0 Project Cost |
| 5.0 Willing To Refer |
| Project Type: | Web Development |
|---|---|
| Project Cost: | Less than $10,000 |
| Project Duration: | Jun 2025 - Apr 2026 |
| Business Type: | Aerospace & Defense |
|---|---|
| Location: | San Francisco, USA |
Questions & Answers
Technically sharp, commercially sensible, and genuinely easy to work with throughout
Cormac Whelan / VP of Engineering | May 03, 2026We handed this team an aggressive deadline, a genuinely complicated scope, and a client-side team on our end that was stretched thin and slow to respond at times. They handled all of it without complaint. When they needed something from us they asked precisely and on time. When they didn't, they just kept moving. The project still landed on schedule despite our side being the weaker link for a good chunk of it, which tells you something about how they operate under pressure.
Project summary
Audience data was scattered across eight different tools with no shared identity layer. Personalization was never going to work until that foundation got fixed first.
| 4.0 Overall Rating |
| 4.5 Quality |
| 4.5 Schedule |
| 4.0 Project Cost |
| 5.0 Willing To Refer |
| Project Type: | Industry-Specific Solutions |
|---|---|
| Project Cost: | $10,000 to $49,999 |
| Project Duration: | Oct 2025 - Feb 2026 |
| Business Type: | Media & Entertainment |
|---|---|
| Location: | Cork, Ireland |
Questions & Answers
Time-to-publish dropped from days to under an hour
Marc-Antoine Girard / VP of Innovation | Apr 24, 2026Our stakeholder list for this project included board members, operations leads, compliance, and end users, all with wildly different levels of technical fluency and different definitions of success. Managing that mix well is genuinely hard, and this team did it better than any vendor we've worked with. They shifted register depending on who they were talking to without ever dumbing down the substance, kept expectations honest the whole way through, and delivered something each group could point to as meeting their own bar. That range is rare.
Project summary
Our trading platform had been patched together for close to a decade. Latency was creeping up, technical debt was compounding, and a proper rebuild had stopped being optional.
| 4.0 Overall Rating |
| 4.0 Quality |
| 4.0 Schedule |
| 4.5 Project Cost |
| 5.0 Willing To Refer |
| Project Type: | CMS Development |
|---|---|
| Project Cost: | $10,000 to $49,999 |
| Project Duration: | Oct 2025 - Feb 2026 |
| Business Type: | Financial Services |
|---|---|
| Location: | Montreal, Canada |
Questions & Answers
Started as a single project and earned a permanent spot on our preferred vendor list
Soo-Ah Yoon / Director of Platform | Mar 21, 2026We handed this team an aggressive deadline, a genuinely complicated scope, and a client-side team on our end that was stretched thin and slow to respond at times. They handled all of it without complaint. When they needed something from us they asked precisely and on time. When they didn't, they just kept moving. The project still landed on schedule despite our side being the weaker link for a good chunk of it, which tells you something about how they operate under pressure.
Project summary
Our product thinking internally was solid, but our execution depth in this particular technical domain wasn't. We needed real specialists, not another generalist team.
| 4.0 Overall Rating |
| 3.5 Quality |
| 4.0 Schedule |
| 3.5 Project Cost |
| 5.0 Willing To Refer |
| Project Type: | Low-Code / No-Code Development |
|---|---|
| Project Cost: | $500,000+ |
| Project Duration: | Aug 2025 - Feb 2026 |
| Business Type: | Aerospace & Defense |
|---|---|
| Location: | Daegu, South Korea |
Questions & Answers
Modules built around how we actually operate instead of forcing us to change our process
Fiona McAllister / Chief Technology Officer | Feb 28, 2026Five months post-launch, we're running at roughly double the transaction volume we'd specified in the original scope document, and the platform hasn't needed a single structural change to handle it. That's the real tell for whether a team designed for what you told them versus what you were actually going to need. We're now scoping a second phase and I expect this to be a multi-year relationship at this point.
Project summary
A licensing deal had handed us a major catalogue, but our streaming infrastructure couldn't deliver it reliably at scale. We needed a cloud-native video platform inside of six months.
| 4.5 Overall Rating |
| 4.5 Quality |
| 5.0 Schedule |
| 4.0 Project Cost |
| 5.0 Willing To Refer |
| Project Type: | ERP Development |
|---|---|
| Project Cost: | $10,000 to $49,999 |
| Project Duration: | Sep 2025 - Dec 2025 |
| Business Type: | Media & Entertainment |
|---|---|
| Location: | Glasgow, UK |
Questions & Answers
Turned marketing spend from a cost debate into a revenue conversation with leadership
Elin Holmqvist / Head of Product Engineering | Jan 14, 2026The easiest thing to praise is the technical output itself — solid test coverage, a deployment pipeline that just works, documentation that people actually reference instead of ignoring. But what I keep coming back to is the number of conversations we haven't had to have since launch. No 2am incident calls. No emergency patches. No post-mortems about what went sideways. That absence is really the whole pitch, if you ask me.
Project summary
Our headcount had grown faster than our platform engineering depth. We needed an experienced team to close that gap while we hired, without letting quality or the roadmap slip in the meantime.
| 4.0 Overall Rating |
| 4.0 Quality |
| 3.5 Schedule |
| 4.0 Project Cost |
| 5.0 Willing To Refer |
| Project Type: | Digital Marketing |
|---|---|
| Project Cost: | $500,000+ |
| Project Duration: | Jul 2025 - Dec 2025 |
| Business Type: | Information Technology |
|---|---|
| Location: | Uppsala, Sweden |
Questions & Answers
Brought coherence to a product carrying four years of accumulated visual inconsistency
Roisin Cassidy / VP of Product Engineering | Jan 05, 2026Looking back, the thing that stands out most is how uneventful the whole project was. Technology projects of this size tend to generate their share of fire drills and awkward escalation calls. This one really didn't. Issues got flagged early enough that they never became incidents, scope changes went through an actual process instead of a tense phone call, and risks were tracked rather than just hoped away. That kind of quiet competence is unusual in my experience, and it made the whole thing feel easier on our end than I know it was on theirs.
Project summary
A licensing deal had handed us a major catalogue, but our streaming infrastructure couldn't deliver it reliably at scale. We needed a cloud-native video platform inside of six months.
| 4.5 Overall Rating |
| 5.0 Quality |
| 4.0 Schedule |
| 4.5 Project Cost |
| 5.0 Willing To Refer |
| Project Type: | UI/UX Design |
|---|---|
| Project Cost: | $150,000 to $499,999 |
| Project Duration: | Jan 2025 - Oct 2025 |
| Business Type: | Media & Entertainment |
|---|---|
| Location: | Belfast, UK |
Questions & Answers
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