Top Custom Software Development Companies in California
We ranked 7 custom software development companies in California on client reviews, how many are verified, service focus and profile completeness. Updated October 2026. How rankings work
Partners that build software around how a business actually works, often replacing spreadsheets and a patchwork of subscriptions with one system the company owns.
- Rank 1
Chicago custom software consultancy that helps organizations decide what to build, then designs and engineers it, including AI agents and platforms.
No reviews yet
Chicago, IL
- Custom Software Development
- AI & Automation
- Product Design & Development
- Team
- 100-249 people
- Rank 2
Irvine software consultancy building custom business applications such as CRMs, ERPs, portals and learning platforms with onshore engineers.
No reviews yet
Irvine, CA
- Custom Software Development
- Web Development
- AI & Automation
- Rank 3
Los Angeles software agency building web and mobile apps and AI products with embedded senior teams for startups and enterprises.
No reviews yet
Los Angeles, CA
- Custom Software Development
- Mobile App Development
- AI & Automation
- Team
- 50-99 people
- Rank 4
Strategy, UX design and software development studio focused on healthcare and B2B products.
No reviews yet
Culver City, CA
- Product Design & Development
- Custom Software Development
- Mobile App Development
- Rank 5
San Diego digital product agency that designs, builds and maintains web and mobile applications.
No reviews yet
San Diego, CA
- Product Design & Development
- Custom Software Development
- Mobile App Development
- Rank 6
Dallas AI consulting, design and engineering firm building AI solutions and digital experiences for regulated enterprises.
No reviews yet
Dallas, TX
- AI & Automation
- Product Design & Development
- Custom Software Development
- Rank 7Down 1 from #6
Long Beach design and engineering studio building websites, custom web software, mobile and TV apps, and e-commerce for brands.
No reviews yet
Long Beach, CA
- Web Development
- Custom Software Development
- UX/UI Design
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