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Custom AI app development

New AI products, or AI features inside the product you already have.

We design the product, pick the models and build the whole thing: the AI, and the accounts, payments and admin around it. Then we can stay on to run it.

Start a projectSee related work
Illustration: an existing accounts table with an AI summary panel added to it. Sample data.

Illustration with sample data.

Scope

What we build.

Who it’s for

  • Founders with an AI product idea who need a team to design and build it.
  • Companies adding AI features to a product they already have.
  • Teams with an AI prototype that now has to work for real users.
  • Web apps built with Next.js and TypeScript
  • AI features inside your existing product
  • Sign-in, accounts and roles
  • Credits, plans and payments with Stripe
  • Admin and review screens for your team
  • Error monitoring from the first release

Approach

How it typically works. Every project is different. This is the usual shape.

  1. 01

    Discovery

    We learn the problem, who will use the app and what a good result looks like.

  2. 02

    Design

    We plan the screens and the flow, choose the models and agree scope and cost with you.

  3. 03

    Prototype

    You try a working version early, on your own inputs.

  4. 04

    Launch and run

    We launch it, and can stay on to monitor and improve it.

Related work

See it in our own work.

  • Illustration of the Lovino studio: a prompt, a choice of image models, the results, and a Made with AI label on each file. Sample prompt.

    Image and video generation

    Lovino

    Lovino is a full AI product we designed, built and run, with accounts, credits and subscriptions around the AI.

    Read the case study: Lovino
  • Illustration of a hiy.ai agent embedded on a website. It answers in the owner’s voice, shows its sources, is labelled as AI, and admits when a topic isn’t covered. Sample site and text.

    AI twins and support agents

    hiy.ai

    hiy.ai is a web app with a dashboard, public pages and a widget that works on other websites.

    Read the case study: hiy.ai

Models and tools

Models and tools we use.

Models

  • Anthropic Claude
  • OpenAI GPT
  • Google Gemini
  • DeepSeek

Tools

  • Next.js
  • TypeScript
  • Supabase
  • Postgres
  • Vercel
  • Vercel AI Gateway
  • Stripe
  • Resend
  • Sentry

Names are trademarks of their owners.

Questions

Common questions.

Can you add AI to a product we already have?

Yes. We can build AI features into your codebase, or fix and extend the AI that’s already there.

Which model will you use?

The one that fits the task. We try candidates on your own inputs, and we aren’t tied to any one provider.

Do you design the product too?

Yes. We plan the screens and the flow as well as building them.

What happens after launch?

We can stay on to monitor the app, fix issues and move to a better model when one fits.

Security and privacy

Careful with your data.

  1. Registered in Ireland

    Foldox Limited is an Irish company and follows the EU GDPR.

  2. Your data stays yours

    We don’t use client data to train shared models without your agreement.

  3. Agreements first

    We can sign an NDA and a data processing agreement before we see your data.

Other services

More we can build.

Start a project

Have an AI app in mind?

Tell us about it. We aim to reply within two working days.

Start a projectcontact@foldox.com