Our expert analysts ranked the top product design companies in California that create multiple product categories such as apps, digital platforms, physical products and more to help your brand stand out and engage new audiences. Filter by price, reviews, portfolios and more to select a partner that best fits your business needs.

Organic rankings are determined by five factors: top services, reviews, portfolio, awards/press, and team expertise. Sponsored listings pay for a placement that appears above organic positions. Sponsorship does not affect star ratings or review content - read more on our methodology page.

United States × California × Construction × $25,000 - $50,000 ×Clear Filters
  • Your trusted AI software development partner

    Diffco is a San Francisco AI-first software engineering partner for growth-oriented teams. We embed senior engineers and product strategists who turn AI vision into shipped, revenue-driving products. Our team has spent the last 18 years building: SaaS platforms, web & mobile apps, and AI products...

    Top Services:

    • AI Development
    • Software Development
    • Staff Augmentation
    • Mobile App Development
    • Web Development
    • Show more
    Location
    San Jose, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $110/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    31 Projects Listed

    Diffco Services

    • AI Development
    • Software Development
    • Staff Augmentation
    • Mobile App Development
    • Web Development
    • eCommerce Development
    • IoT
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Mars
    • Food Rocket
    • FlashGrid
    • Nokia
    • Instreamatic
    • Quire
    • Legionfarm
    • Latoken
    • Genius One
    • Shift
    Data sourced from the agency's DesignRush profile

    Diffco Reviews & Testimonials

    • Ivan Pasichnyk
      Ivan Pasichnyk CEO at WeLabelData
      5.0★

      AI Development Review from Ivan Pasichnyk

      We brought Diffco in to deliver the AI and computer vision components for one of our clients, an image generation startup. Because the work sat inside our own client relationship, we needed a partner we could trust to operate at our standard without us managing them day to day - and that is exactly what we got. Diffco owned the technical approach, built the computer vision and AI layer, and delivered the full scope in three months, on schedule. The engineering quality was high, they raised the right questions early instead of late, and they handled the confidentiality the project required without us having to chase it. After delivery they stayed on to support the system, which mattered to us as much as the build itself. When you subcontract a technical project inside your own client relationship, the risk is that the partner makes you look bad. Diffco did the opposite. They've earned our trust and we'd work with them again.

    • Oleg Sotnikov
      Oleg Sotnikov CEO at AppMaster
      5.0★

      AI Development Review from Oleg Sotnikov

      Diffco built a complex, production-grade AI agentic system and backend for our client's fintech platform owning architecture, AI/ML components, and AI agents in a security- and compliance-sensitive environment. They delivered on time and within budget, communicated proactively, and operated like part of our own team, taking ownership and suggesting better solutions throughout. Deep AI/ML and senior backend expertise. We'd happily work with them again.

    • Julia Platova
      Julia Platova VP Strategic Partnerships at OVA Solutions
      5.0★

      Mobile App Development Review from Julia Platova

      We partnered with Diffco for a comprehensive software development project aimed at delivering a mobile application and backend system for our client. The goal was to create a seamless, secure, and scalable solution within a 4-month timeline and $50k-$200k budget.Diffcos team was highly professional from start to finish. They handled everything: UI/UX design, backend architecture, API integration, and deployment.After the launch, they continued to support us with maintenance and performance optimization.The application received positive feedback and has proven stable and scalable.Were highly satisfied with Diffcos expertise, commitment, and ability to deliver real results.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Skin In The Game

    Threefifty is a leading CRO agency known for delivering rapid, measurable growth through data-driven optimization strategies. By leveraging proven insights and personalized conversion techniques, the agency helps high-profile clients maximize revenue and improve performance across digital channels...

    Top Services:

    • UI/UX Design
    • Web Design
    • Web Development
    • Creative Services
    • Branding
    • Show more
    Location
    San Francisco, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $350/hr
    Minimal Budget
    $25,000 - $50,000

    Threefifty Services

    • UI/UX Design
    • Web Design
    • Web Development
    • Creative Services
    • Branding
    • Product Design
    • SEO
    • Digital Marketing
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • AOL
    • Microsoft
    • Autodesk
    • IBM
    • Aecon
    • Oaklu
    Data sourced from the agency's DesignRush profile

Why companies trust DesignRush

Every agency is independently vetted before it can be listed or ranked

1

Identity Check

We verify businesses and reviewer LinkedIn profiles for integrity.

Agencies vetted
126,060+
2

Portfolio Review

We review agency work, case studies, and results to confirm skill.

Applicants rejected
49%
3

Ongoing Audit

We monitor listings regularly; outdated agencies are removed.

Agencies verified
2

Some agencies pay for sponsored placement, clearly labeled and held to the same vetting standards.

See how rankings and monetization work.

ReceiveFreeProposals

For your project

1

Specify your budget, timeline and project requirements

2

Our experts curate a list of up to 5 most qualified candidate agencies

3

We connect you with them so you can choose the most suitable partner