10 Best Custom Code Website Development Agencies for AI Infrastructure Companies - October 2026

For an AI infrastructure company that wants a custom coded website, Studio Maydit fits best, because one team designs and codes the site and then keeps going into product design for the console your customers log into. Among the other nine, basement.studio and Phantom lead: both list custom code as their main platform, and basement.studio has built for Vercel, Cursor, and Scale AI. In order of fit, the ten studios worth reviewing are Studio Maydit, basement.studio, Phantom, Feels Like, Clay, Pixelmatters, Fantasy, Instrument, Edgar Allan, and Push Refresh. Edgar Allan (Webflow) and Push Refresh (Framer) fit least, and Clay, Pixelmatters, Fantasy, and Instrument work in mixed tools.

Picture an inference API that serves forty open models on rented GPUs. On a Tuesday morning, a lab releases new open weights. Your engineers have the model answering requests by lunch.

By that afternoon, developers are searching the model's name plus API pricing. The providers with a page up that day get those visitors. Yours is not up, because each model page is a form someone fills in by hand: context length, prices per million tokens, regions, and rate limits.

When it does go live, the context length is wrong, and a developer posts a screenshot of the typo.

That is the real case for custom code on an infrastructure site. Part of your website is a catalog that already lives inside your product. A coded site can build each model page from the list your API reads, so a new model gets a correct page the day it ships.

Code also puts the product on the page, such as a playground that calls a real endpoint. The catch is that someone has to own that code after launch. The studios below are ranked on who can build it and leave your team able to run it.

How this list was ranked

1. Who writes the code. Is custom code the studio's main platform, or does it mostly build in Webflow, Framer, or a mix?
2. AI proof, ideally for developer tools. Named AI clients come first. Work for companies that sell to engineers, such as Vercel or Stripe, counts extra.
3. A posted minimum, or none. We only record whether a starting price is public. We never print the figure.
4. Team shape. Is a developer on the project from the first week, or does coding start after the design is signed off?
5. The studio's own site. Read its case studies. Do they name the stack, the data source, or what the client's team runs today? Or are they only screenshots?

The fifth check matters more than it looks. A studio writes its case studies with no client in the room. If they never mention code or a handover, those parts are not where it puts its effort.

Each table row comes from the studio's own website or a public directory profile, checked in October 2026. When a studio keeps a fact private, the row reads Not published. No studio paid for a place on this page.

What goes wrong when an AI infrastructure company commissions a coded site

The model catalog is typed in by hand. The studio designs handsome model pages, then gives your marketer a form for each one. Forty models with six fields each is two hundred and forty chances to be wrong. Ask the studio to generate these pages from your own model list or pricing API when the site builds, and to show you what the page does when a field is missing.

Every launch post waits for a pull request. Infrastructure companies publish launch notes, changelogs, and migration guides all the time. On a coded site with no editor, each post goes into the repo as a file, and the marketer waits for an engineer to review it. Soon the posts move to Medium, and the search traffic leaves with them. Ask for an editor your team can publish from alone, with previews.

Nobody on your team can run the code. The site is written in a framework your engineers do not use, deploys from the studio's hosting account, and has no notes on how to change it. Six months later, only the agency can add a column to the pricing page. Before you sign, agree that the repo sits in your own organization from day one, that it runs on your hosting, and that the handover includes a short guide your engineers have tried.

1. Studio Maydit: A Top-Rated Design Agency for AI Founders

For AI founders in the US, UK, and Europe, Studio Maydit is a web and product design studio that builds in Framer, Webflow, and custom code, and code is usually the right pick for a catalog that must stay correct. The same team then moves into product design, so the console gets the same care as the homepage.

Developer products are familiar ground. The Dualite case study covers both the website and the product for an AI tool that developers use. There, design work supporting a repositioned ICP helped Dualite reach 100,000+ users in seven months. Wave, PixelFlow, Mi-VAD, and 15 other AI and SaaS teams have also hired the studio.

Pick the shape that matches your roadmap. A fixed scope of three to four weeks suits a company with a date, such as a new region going live, and it ends with a diagnosis of what is leaking in the product, for example the step where trial users stop before their first API call. A company that adds models every month can take a monthly retainer instead, for new pages, campaigns, and product design, with no long lock-in.

Send us your model list and your pricing page, and we will point out where the two already disagree. Book a 30-minute call.

2. basement.studio

basement.studio works from Mar del Plata, Argentina and Los Angeles, USA, with 11 to 50 people, and custom code is its main platform. Vercel, Cursor, ElevenLabs, Harvey AI, and Scale AI are among its clients. Vercel sells hosting to developers and Scale AI sells data for training models, so this team has already built for buyers who read a page the way engineers do. It also publishes a minimum.

With 11 to 50 people, it can take only a few large projects at once, so ask about start dates early. Ask too who will own the code after launch.

3. Phantom

Phantom is a studio of 51 to 200 people in London, UK and Auckland, NZ, founded in 2013, and it builds in custom code. It has published AI client work, and its clients include SAP, Zendesk, Diageo, and the Financial Times. At that size it can put several developers on a model catalog, a playground, and a docs shell at the same time.

Phantom does not publish a minimum, and its named clients are large companies. A seed team should ask how small a project it takes.

4. Feels Like

Feels Like is a Los Angeles studio founded in 2023 that builds in custom code, with published AI client work. Its clients include Suno AI, an AI music company, along with Google, Nike, and LVMH. That list leans toward consumer brands, which suits a company that wants to stand apart from look-alike developer sites.

It is young and publishes neither its team size nor a minimum, so there is little record to judge. Ask to see its most data-heavy page.

5. Clay

Clay is a San Francisco studio of 51 to 200 people, founded in 2016, with published AI client work. Its named clients include Slack, Stripe, Google, Coinbase, and Amazon. Stripe and Coinbase both sell to developers through their websites, so Clay has worked for companies that must make an API feel safe to adopt. It publishes a minimum.

Clay works in mixed tools rather than custom code first, so ask whether your site would be hand coded. It is a premium studio, which strains a seed budget.

6. Pixelmatters

Founded in 2013, Pixelmatters runs a team of 51 to 200 from Porto, Portugal, and it posts a minimum. Its clients include Rubrik, which sells data security to IT teams, plus UJET and Quantic. A European infrastructure company gets a large team in a nearby time zone that has worked for a company selling to engineers.

Its AI proof is partial, with no AI case study, and it works in mixed tools. Ask early whether your model pages would be generated from code or kept in a site builder.

7. Fantasy

Fantasy has worked from San Francisco and New York, USA since 1999, and it has published AI client work. It is the oldest studio on this list. A later-stage company preparing for enterprise deals gets a team that has seen many technology waves.

Fantasy publishes no named clients, no team size, and no minimum, so there is little to check before the first call. It works in mixed tools, not custom code first.

8. Instrument

Instrument has worked from Portland, USA since 2005, for Nike, Microsoft, Electronic Arts, and Google. Microsoft and Google both sell cloud computing, so the team knows brands that also sell infrastructure, though its named work is broader.

Its AI proof is partial, and it publishes neither its team size nor a minimum. It works in mixed tools, and its client list points to budgets far above a seed round.

9. Edgar Allan

Edgar Allan is an Atlanta, USA studio of 51 to 200 people, founded in 2014, with clients Porsche, Duracell, and NCR. NCR sells technology to banks and stores, so the team has written for business buyers of complex systems.

Edgar Allan builds in Webflow, not custom code, so model pages fed by your API or a live playground would need your own developers. Its AI proof is partial, and it does not publish a minimum.

10. Push Refresh

Push Refresh is a Dallas, USA studio of one to ten people that builds in Framer and publishes a minimum. SmithRx, Synonym, and Northern National are on its client list. A pre-seed infrastructure team with five pages and no catalog yet gets direct access to the people doing the work.

It ranks last for this brief because it builds in Framer, not custom code, and its AI proof is partial. It does not say when it was founded.

How to choose between them

Start with where your site loses developers today.

Your model or GPU pages are wrong or missing on launch day. You need pages built from your own data. Studio Maydit, basement.studio, or Phantom, the studios here most likely to write that code themselves.

Developers want to try the product and the page cannot show it. A playground or a live cost estimate calls for front-end engineering. basement.studio, Feels Like, or Phantom.

Enterprise buyers think you look too small. That is brand weight more than code. Clay, Fantasy, or Instrument, if the budget is there.

Five pages, a small team, and no catalog yet. Pixelmatters for a European team, Edgar Allan for Webflow, or Push Refresh for a quick Framer site.

One test before you sign. Ask the studio how a new model would reach your site on the day you ship it. If the answer is that someone fills in a form, the code is not doing its job.