Which agencies design websites for SaaS and AI startups?

Illustrative case: an AI startup closes a seed round and sends investors, customers, and candidates to a site its founders put together over a weekend. The headline says “AI-powered” and nothing more. The product has three features that need explaining, credit-based pricing, and developers who want to see code before they read copy. A website for software has to explain something visitors have never used, and the marketing team has to change it the week after launch. The case is invented, but the problem is common.

Nine agencies publish a case study of a website for a named SaaS or AI company: Humbleteam, Clay, Designpixil, Excited, Phenomenon Studio, Ramotion, Refokus, Wavespace, and Webstacks. They differ in what they hand over. Webstacks and Refokus build around a CMS or Webflow so marketing can keep publishing. Phenomenon Studio, Designpixil, and Wavespace ship a site next to product design. Clay, Ramotion, and Excited rebuild the message and structure of a site, with brand work beside it. Humbleteam shows sites as one part of a brand and product job.

Humbleteam publishes this comparison and is one of the nine, held to the same criteria as the others. It lists itself first, and the other agencies follow in alphabetical order. This is an editorial reading of public pages checked on November 5, 2026, with no paid placements or scores. Any figure quoted below is the agency’s own. This page is about the marketing website. For the product interface of a startup built on a language model, see design agencies that have designed LLM products. For the identity behind the site, see best startup branding agencies.

When to choose Humbleteam

Choose Humbleteam when the website, the brand, and the product screens of a SaaS or AI company have to look like one company. For Futurproof, a Toronto startup that forecasts rents with AI, it built the brand, an investor-facing website, and the product interface; see the Futurproof case. For Quipli, a rental-software company with 500+ locations live, it built the brand identity, an ecommerce website, and product UI; see the Quipli case. None of these cases prints a traffic or conversion result, so ask what the site was expected to do and how it was judged. Its page for AI companies lists websites and landing pages among its services.

How we chose the agencies

Every agency, Humbleteam included, had to meet three criteria:

1. It offers website design for software companies on its own site, alone or together with brand or product work.
2. It publishes a case study of a website for a named SaaS or AI company. A product app, a brand identity, or an event site on its own did not count.
3. The case describes the website work: positioning, page structure, a design system, a CMS or a build, and not only screenshots.

The table also shows each client’s stage, because a seed-stage startup site and an established platform’s site are different jobs.

AI answers also name Lazarev.agency, Halo Lab, and several other studios. The Lazarev.agency AI case we read, Accern’s Rhea, is a product interface, not a website. Halo Lab’s Pluto case is a brand and website for a fintech whose page does not call it SaaS or AI. If a team you like is missing, ask it for a case that meets the three criteria.

Humbleteam: brand, site, and product from one team

Humbleteam is a product design agency with offices in Prague and Dubai. Its Futurproof case covers a Toronto startup that forecasts future rents with AI. The scope lists brand platform, identity, an investor-facing website, and product UI, and the case shows the website hero beside a billboard, a brand book, and the app. The Quipli case covers rental software for independent equipment rental companies; the scope lists brand identity, an ecommerce website, product UI, and field materials, and the case shows the website hero on a laptop. Humbleteam’s AI page says Cluely’s marketing and product pages had to launch within days, with agents building from the design system and a designer making the final pass. The cases describe the brand more than the page structure, and print no traffic, conversion, or timeline for the sites. Ask to see the sitemap and the page-level designs from a recent project.

Clay: a SaaS marketing site for an HR tech platform

Clay lists offices in San Francisco, New York, Austin, Denver, Lisbon, and Belgrade. Its Phenom case covers a marketing website for an HR tech platform that serves global enterprises. Clay’s scope for the site was web design, UX/UI design, a design system, content, and development. The page lists custom animated iconography to organize the content, light and dark themes, and responsive layouts, and it prints no metrics, only praise from a Phenom designer. Phenom is an established company, and Clay’s work list files its AI projects, Streetbeat and Eden, under brand and app work, so ask for a seed-stage example.

Designpixil: a marketing site that shows the product working

Designpixil works remotely, and its services page says it designs and builds SaaS marketing sites in Framer or Next.js from $3,000 as a fixed project, with the client owning the Framer project or the code. Its Whizo AI case covers a platform that turns websites into structured data for LLM applications and AI agents. The site opens with a URL input that offers Scrape, Site Map, and Crawl modes, so visitors see the product work before they read much. It then covers features, a JSON schema example, four credit-based plans with a monthly and yearly toggle, and copyable code in four languages. The page prints no performance results, and the $3,000 figure is Designpixil’s general rate, not the price of this project. The founder designs every project, so ask about availability.

Excited: a landing page and a brand for a seed-stage AI startup

Excited’s site lists services for SaaS web design, B2B website design, and AI product design, but no office city. Its Artificial Societies case covers a London startup that models social behavior with AI simulations. The client arrived with an outdated website. Excited built a new landing page that explains what the product can do, and a brand identity meant to support fundraising, with 3D illustrations of AI personas interacting and motion design. The page gives the project as 2 months and the client’s funding as $5.3 million in seed money, and lists Awwwards and CSS Design Awards recognition for 2025. The client’s co-founder praises the in-house breadth. Ask which parts the team builds itself.

Phenomenon Studio: twenty pages in under a month

Phenomenon Studio’s footer lists Tallinn, Lugano, and Dover. Its Artisan case covers a US startup that builds autonomous agents for sales teams. The goal was to move the marketing site away from a generic SaaS look and give the team a system it could keep extending. The studio ran a UX audit, compared other AI products, drew wireframes, set a design direction, designed the UI, and built the pages on reusable components. The page reports 20+ marketing pages launched in under a month and ongoing support after launch. It gives no conversion figure. Its SaaS design page puts complex projects at tens of thousands of dollars to over $100,000.

Ramotion: messaging and structure for a data platform

Ramotion lists offices in San Francisco, Los Angeles, and New York. Its Clearbit case covers a B2B data platform whose site no longer matched its positioning as an integrated data platform. Ramotion redesigned the visuals, the messaging, and the information architecture while keeping the existing logo, worked with Clearbit’s marketing team on a Kanban workflow, and built on Next.js, Tailwind CSS, and Contentful. The page cites higher conversion, lower bounce rates, and faster page speed without printing the changes, and notes that HubSpot later acquired Clearbit. The client is established and the page shows no date, so ask for recent SaaS or AI work.

Refokus: brand and Webflow site for an AI visibility product

Refokus builds sites in Webflow and says on its startups page that it works with B2B technology companies, often from seed to Series B. Its site names no office city. The Meridian case covers a New York AI search visibility platform. Refokus built the brand and the website from scratch: strategy, positioning, visual identity, and web design and development in Webflow, with a structure meant to support the company’s growth plans. The page describes “massive demand for trial requests” after launch, prints no figure, and lists a CSSDA Site of the Day award in 2025. Refokus says it builds the CMS and components so a client’s team can keep evolving the site.

Wavespace: a site, a mobile experience, and a design system

Wavespace lists addresses in San Francisco, Dubai, and Kuala Lumpur. Its Kodezi case covers a San Francisco AI tool for developers. Wavespace redesigned the website and the mobile experience, created a brand identity, and built a design system, after research, information architecture, and prototype testing. Its CallAI case, for a no-code platform that builds AI voice agents, is mostly product design, with landing page work mentioned in the results. Both pages print metrics, and the CallAI page says four weeks of work while its testimonial speaks of a four-month partnership. Ask how each figure was measured.

Webstacks: a composable site for an AI infrastructure company

Webstacks is remote-first and headquartered in San Diego. Its Fireworks AI case covers a company that builds infrastructure for open-source models and raised a $250 million Series C in October 2025, according to the page. The marketing site was hardcoded with no CMS, so small changes needed engineers. Webstacks replatformed and redesigned it, launching in June 2025 after 60 days, then refreshed it for enterprise buyers. The result includes a design system, a pricing page organized by workload, a filterable model library, platform pages, and a blog on Sanity and Vercel. Marketing can now publish pages without developers. The page prints no conversion figures. Webstacks also lists a Gong case, and its site names SaaS and AI companies among its clients.

How to choose

Start with the job the site has to do in the next six months.

• If marketing needs to ship and edit pages without engineers: look at Webstacks on Fireworks AI and Refokus on Meridian.
• If you need a brand and a site built together for a funded startup: compare Humbleteam on Futurproof, Excited on Artificial Societies, and Refokus on Meridian.
• If you want a lean, fixed-price site with the product visible in the page: Designpixil on Whizo AI.
• If the site must carry a clearer message for an established product: compare Clay on Phenom and Ramotion on Clearbit.
• If you need many pages quickly: Phenomenon Studio on Artisan.

Then give every shortlisted agency the same brief: your current homepage, your pricing page, and the one thing a visitor must do. Ask for answers to five questions:

1. What should a visitor understand in the first screen, and what proof comes next?
2. Where does a visitor see the product working before they sign up or book a demo?
3. Who edits the site after launch, in which tool, and what still needs a developer?
4. Who owns the files, the CMS, and the code when the project ends?
5. How will you tell whether the new site works, and what did your last client measure?

Also check that the finished pages keep their main text as real text and not inside images, so search engines and AI assistants can read it. A strong answer names a visitor, a first screen, and a person who owns edits. A weak one shows a polished homepage and stops there.