topappdevelopmentcompanies
Write a Review menu
Menu

Overall Review Rating

4.4 (4 Ratings)

Quality 4.8/5
Schedule 4.1/5
Cost 4.3/5
Communication 4.3/5

Overview

One & Zero is a digital marketing company based in New York. Their methodology is based on proven, organic Internet strategies and best practices. If you choose to work with them, your investment will develop long-term results and profits for your company. They can provide you with a complete range of digital services. They truly understand our clients and their users.

founded
Founded 2017
employees
Employees 10 - 49
hourly rates
Hourly Rates $200 - $300
our rating
Our Rating 4.4/5
contact
Contact +16469421656

Services

  • AI Development
  • Android App Development
  • Market Research
  • MVP Development
  • Mobile App Development
  • Web Development
  • Agile Coaching
  • iOS App Development
  • Automotive R&D
  • IoT App Development
  • Cross Platform Development
  • Logo Designing

Industries Served

Information Technology Legal Services Manufacturing Real Estate

One & Zero Reviews

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

Derek Watts

Director of Operations - Stonebridge Capital LLC
Posted on May 30, 2025
4.5 Overall Rating

A vendor that earned a place on our preferred supplier list through delivery, not sales

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

Our OEE reporting relied on manual data entry at the line level. We needed real-time, reliable data and our existing systems were not going to provide it without a significant rebuild.

Quality 4.5/5
Schedule 4.0/5
Cost 4.0/5
Communication 4.5/5
project type
Project Type POS System Development
industry
Industry Manufacturing
project cost
Project Cost $150,000 to $499,999
Read Full Review

Sarah Kimball

Product Manager - Clearpath Health Solutions
Posted on Dec 05, 2023
4.0 Overall Rating

Monetisation integrated in a way players accepted. Positive reviews mentioned it specifically.

What I appreciated most was that they were honest when things were not going to plan. There was one point mid-project where a dependency was going to affect our timeline and they told us three weeks before it would have become critical. That gave us time to adjust. Vendors who manage upward proactively are rare. This one did it consistently throughout the engagement.

Project summary

Matter administration time had grown to the point where it was showing up in utilisation metrics. Every hour spent on systems was an hour not billed — the business case did not need modelling.

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

Tom Harding

Founder - Meridian SaaS Ltd
Posted on Sep 01, 2022
4.5 Overall Rating

Core Web Vitals are green across the board. Our SEO team sent a thank-you note.

We received proposals from six vendors. Four of them quoted us prices that bore no relationship to the actual scope. This team came back with something realistic and then delivered against it exactly. I have worked on enough technology projects to know that the gap between what is proposed and what is delivered is where trust gets destroyed. There was no gap here. What was promised is what we got, and the ongoing relationship we have built from this is something we intend to continue.

Project summary

As a technology company ourselves we hold our vendors to the same standard our clients hold us to. Finding a partner who could meet that bar without being hand-held through the process was the challenge.

Quality 5.0/5
Schedule 4.0/5
Cost 4.5/5
Communication 4.5/5
project type
Project Type Web Development
industry
Industry Information Technology
project cost
Project Cost $10,000 to $49,999
Read Full Review

Katrin Bauer

Head of Product Management - Bayern Software KG
Posted on Aug 06, 2022
4.5 Overall Rating

Mixed reality experience that impressed the client audience we were trying to win

We went with a smaller team than we had originally planned for. I had concerns about whether the capacity would be sufficient given our timeline. Those concerns were unfounded. The team was focused, communication was constant, and the quality at each milestone review was consistent throughout. Smaller does not mean slower when the people are the right ones and this engagement proved that.

Project summary

A new commercial property division required tooling that was fundamentally different from our residential platform. Extending the existing system was not viable.

Quality 5.0/5
Schedule 4.0/5
Cost 4.0/5
Communication 4.0/5
project type
Project Type AR/VR Development
industry
Industry Real Estate
project cost
Project Cost $500,000+
Read Full Review
back to top