topappdevelopmentcompanies
Write a Review menu
Menu

Overall Review Rating

4.3 (7 Ratings)

Quality 4.5/5
Schedule 4.4/5
Cost 4.3/5
Communication 4.4/5

Overview

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.

founded
Founded 2014
employees
Employees 10 - 49
hourly rates
Hourly Rates $100 - $149
our ratings
Ratings 4.3/5
contact
Contact N/A

Services

  • Web Development
  • CMS Development
  • Digital Marketing
  • Android App Development
  • Cryptocurrency Wallet Development
  • Enterprise App Development
  • PHP Development
  • Cross Platform Development
  • Cloud Migration Services
  • App Marketing
  • Mobile App Development
  • iOS App Development

Industries Served

Education Environmental Services Financial Services Gaming & Gambling Information Technology Insurance Manufacturing

NotionTheory Reviews

Have a look at these client reviews on previously delivered projects.

Radosław Kowalczyk

Head of Development - Wisła Software Sp zoo
Posted on Jun 09, 2026
4.5 Overall Rating

Launched at 4.7 stars, no critical bugs in the first two weeks. Clean.

The technical quality is the obvious thing to highlight. The automated test suite is comprehensive, the deployment pipeline is solid, and the documentation is actually useful rather than written to satisfy a checklist. But the metric I keep coming back to is what has NOT happened since go-live. No 2am incident calls. No emergency patches. No post-launch retrospectives about what went wrong. For a system of this complexity, that outcome is exactly what we paid for.

Project summary

Seven years of incremental changes had left our trading platform fragile. Latency was worsening, technical debt was growing, and the rebuild conversation had been postponed long enough.

Quality 5.0/5
Schedule 5.0/5
Cost 5.0/5
Communication 5.0/5
project type
Project Type Game Development
industry
Industry Financial Services
project cost
Project Cost $500,000+
Read Full Review

Beatriz Cavalcanti

Chief Digital Officer - Cerrado Tech SA
Posted on Jun 17, 2025
4.0 Overall Rating

Our team stopped worrying about infrastructure. The value of that is hard to overstate.

Honestly, I came into this engagement with some scepticism. We had a bad experience with a vendor twelve months earlier and I wanted to see evidence of competence, not just hear about it. The discovery documentation was the first signal. The sprint delivery consistency was the second. By go-live I had stopped being sceptical and started planning how to expand the engagement. The production system has been stable from day one and our internal team loves working with the codebase they left us.

Project summary

Unplanned downtime was our single largest controllable cost. Predictive maintenance data showed we could address most of it — but only with the right data infrastructure in place first.

Quality 4.0/5
Schedule 4.5/5
Cost 4.5/5
Communication 4.5/5
project type
Project Type IT Managed Services
industry
Industry Manufacturing
project cost
Project Cost $500,000+
Read Full Review

Hamza Qureshi

Senior Engineering Manager - Karachi Tech Solutions
Posted on Feb 17, 2025
4.5 Overall Rating

Observability stack that caught three production issues before any user reported them

I have been through several technology implementations in my career. The pattern I am used to is: detailed proposal, optimistic timeline, scope creep, overrun, excuses at the end. This engagement broke that pattern at every stage. The timeline was realistic from the start. Changes were managed through process. The final delivery matched what was agreed. Simple, but uncommon.

Project summary

Our content delivery infrastructure worked at current scale but showed clear signs it would not survive the enrolment growth our strategic plan assumed.

Quality 4.5/5
Schedule 5.0/5
Cost 4.5/5
Communication 4.5/5
project type
Project Type DevOps Services
industry
Industry Education
project cost
Project Cost $150,000 to $499,999
Read Full Review

Lachlan Vickers

Co-Founder - Ironbark Software Pty Ltd
Posted on Oct 09, 2022
4.5 Overall Rating

Software project that finished on time. Simple as that, and rarer than it should be.

Our stakeholder group was unusually broad — board sponsors, operational users, compliance leads, and an IT team with strong opinions. I have watched vendors handle that kind of environment badly. This team adjusted how they communicated depending on who they were talking to, managed expectations honestly when things shifted, and delivered something that each group considers a success. Getting everyone to agree on that outcome was not straightforward and they deserve credit for making it happen.

Project summary

The project had a board-level visibility date. We needed a partner who would treat the deadline as their own.

Quality 5.0/5
Schedule 4.5/5
Cost 4.0/5
Communication 4.0/5
project type
Project Type Software Development
industry
Industry Gaming & Gambling
project cost
Project Cost $500,000+
Read Full Review

Rupert Ashford

Director of eCommerce - Hargrove Retail PLC
Posted on Oct 01, 2022
4.5 Overall Rating

Marketing stopped being a cost conversation and became a revenue conversation

We handed them an aggressive deadline, a complex scope, and a client-side team that was stretched and not always available when they needed us. They handled that gracefully. They were precise about what they needed and when they needed it. Where they could proceed independently they did. The delivery landed on time in spite of the constraints we added. I regard that as strong evidence of genuine professional maturity — not just capability.

Project summary

The project had a board-level visibility date. We needed a partner who would treat the deadline as their own.

Quality 4.5/5
Schedule 5.0/5
Cost 4.5/5
Communication 4.0/5
project type
Project Type Digital Marketing
industry
Industry Environmental Services
project cost
Project Cost $10,000 to $49,999
Read Full Review
back to top