Top Custom Software Development Companies in the USA

Between them, the 306 IT service providers on this page cover web development (274), web design (245), software development (209) and mobile app development (155). They also list work in California, New York, Washington and Oregon. 290 of them have written a profile you can read before you get in touch.

1. 289

   

   SalesboxAI

   Software Development · iOS App · CMS Development

   SalesboxAI is an AI-powered platform that delivers Sales Traction for your Business.

   Write a review
2. 290

   

   Maantic Inc.

   ERP Software Development · iOS App · Digital Marketing

   With global clients and worldwide operations, Maantic Inc. is a leading boutique systems integration company and consulting firm that specializes in the implementation of business…

   Write a review
3. 291

   

   ZB.IO

   Web Development · Software Development · UI/UX Design

   A global-scale service observability platform for production workloads with native service mesh support and an agentless approach.

   Write a review
4. 292

   

   Avalara

   E-Commerce Development · IT Services · eCommerce

   Avalara solves Tax. But it's not like you may think. Imagine every product you buy, every service you subscribe to, every transaction you make. It all needs to be taxed.

   Write a review
5. 293

   

   Forte Group’s

   Web Development · Software Development · E-Commerce Development

   Forte Group is a full-spectrum software solution and managed services resource for businesses seeking exceptional engineering talent and extraordinary software.

   Write a review
6. 294

   

   EffectiveSoft Corporation

   Mobile App Development · ERP Software Development · Software Development

   EffectiveSoft is an international software development vendor with 20 years of professional experience.

   Write a review
7. 295

   

   Altoros

   Web Development · Software Development · Machine Learning

   Altoros is a 300+ people strong consultancy that helps Global 2000 organizations with a methodology, training, technology building blocks, and end-to-end solution development.

   Write a review
8. 296

   

   Minit Process Mining

   CRM Development · CMS Development · IT Services

   With its Process Mining solution, Minit helps enterprises unveil the true picture of their operations, enabling them to make data-driven decisions that cut costs and increase…

   Write a review
9. 297

   

   Yieldigo

   Software Development · CRM Development · IT Services

   Yieldigo delivers NextGen AI price optimization for grocers that allow reaching an unprecedented increase in profit and revenue.

   Write a review
10. 298

    

    CDK Global

    Mobile App Development · Web Development · Web Design

    We’re evolving the experience for our dealers and their customers, all over the world.

    Write a review
11. 299

    

    NICE inContact

    CRM Development · IT Services · IT Solution

    NICE inContact makes it easy and affordable for organizations around the globe to provide exceptional customer experiences while meeting key business metrics.

    Write a review
12. 300

    

    NG Logic

    Mobile App Development · Web Development · Web Design

    Write a review
13. 301

    

    BuildThis

    Web Development · Web Design · Software Development

    Write a review
14. 302

    

    Flexaspect LLC

    Mobile App Development · Search Engine Optimization · Web Development

    Write a review
15. 303

    

    Heap Inc.

    Web Development · Web Design · Software Development

    Write a review
16. 304

    MP

    Mobile programming LLC.

    Mobile App Development · Web Development · Web Design

    Mobile programming LLC was started with the mission to provide “Economic as well as Efficient” software solutions.

    Write a review
17. 305

    G

    Glooko

    Mobile App Development · Software Development · Mobile Platforms

    Glooko is the leading remote patient monitoring platform for diabetes and is trusted by the world’s leaders in diabetes care.

    Write a review
18. 306

    27

    [24]7.ai

    Web Development · Web Design · UI/UX Design

    \[24\]7.ai is redefining the way companies interact with consumers.

    Write a review

Articles

Related reading

Articles on this subject first, then the newest.

All articles

United States of America

17 Sept 2026 · TrustList Editorial

Startup funding in the US: the 2026 guide for founders

SBIR and STTR after the 2025 lapse, NSF, NIH and DOE seed funds, SBA programmes, SSBCI, angel groups and accelerators: US startup funding…

Software Development

17 Sept 2026 · TrustList Editorial

How to choose a software development company: the 2026 buyer's guide

How to brief a software development company, what to check before you sign, and the contract terms on code ownership, personal data and…

Software Development

13 May 2024 · Aspire Software Comsultancy

Navigating the Selection Process: Tips for Choosing the Right Custom Software Development Firm

Selecting the right Custom Software Development Company is a pivotal decision that can influence your project's success, budget, and…