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Building an AI SaaS, from scoping to production

A product built on a language model, or an AI feature to add to your SaaS. I scope what needs building, build it and take it to production, with one point of contact.

Book a 15-minute call See pricing

from €2,500a written scope,
delivered in one week

from €8,000mockup, artefacts
and specs for the application

from €20kthe complete application,
through to production

What changes with AI

An AI product is judged on its answers, not its demo.

An impressive demo can be built in a few days. A product that answers correctly, at a controlled cost and without leaking data, needs choices made from the scoping stage.

The right use caseWhat AI does better than a form or a business rule, and what it must not do. Scoping decides before building.
Choosing the modelModel and provider chosen for the expected quality, latency and cost per request, based on side-by-side tests.
Usage costEvery request has a price. It is estimated at scoping and tracked in production, so the margin holds when users arrive.
Data and confidentialityWhat goes to the model, what is stored, what stays with you: written in the specs, not discovered afterwards.
Connections to your toolsThe MCP protocol and APIs connect the model to your data and tools, with precise permissions.
Evaluating the answersA set of reference questions measures answer quality whenever the model or the instructions change.

Method

Scope, prototype, build.

Three steps, and you can stop at the end of each one with a deliverable that belongs to you.

You try the prototype before the first line of production code: we approve something that works.

One week of scoping

Use case, likely model, cost per request and data rules: everything is written down. The details are on the product scoping page.

Artefacts to try out

An interactive prototype to test the answers and the journey before building. The details are on the web application page.

Production, with follow-up

Application deployed on your infrastructure, costs and answer quality monitored, code in your GitHub repository.

Pricing

Decide first, build next.

Three offers, in this order. The model's usage costs come on top, paid directly to the provider.

To decide

Product scoping

from €2,500 excl. VAT

fixed price, delivered in one week

Need reframed and decided
Written scope, including what won't be done
Estimate of costs and risks
A document that belongs to you

One week to know what to build, and what it will cost, before committing to development.

See scoping

To start the project

Mockup, artefacts and specs

from €8,000 excl. VAT

fixed price, depending on the number of screens and the complexity

Functional specification in Linear (epics, user stories, acceptance criteria)
Figma mockup with built-in prototype
Interactive artefacts produced with Claude Code

All the assets needed to start development.

See the web application

To build

Full implementation

from €20,000 excl. VAT

fixed price, confirmed after the 45-minute scoping audit

Everything in the previous offer
Code delivered to your GitHub repository
Supported move to production and handover

Development through to production. A scope, a price and a date written down before we start.

Book a call

No VAT charged: VAT exemption scheme for small businesses, art. 293 B of the French General Tax Code.

The site that presents your product (home page, pricing, waiting list) is built separately, on Framer, Webflow or as code. The details are on the website design and build page.

Online questionnaire

Not sure yet what you need?

Five questions, 20 seconds. You get the service that fits, a budget range and a timeline. No email address asked.

Take the questionnaire

FAQ

Before we start.

Do I need a model trained on my data?

Rarely at the start. Most products start from an existing model, given access to your data at request time. Specific training is only justified once the need is proven.

Which model do you use?

The one that answers your case best, at a sustainable cost. The choice is made on side-by-side tests during scoping, and it can change later without rebuilding the application.

How much does an AI SaaS cost?

Scoping from €2,500 excl. VAT, delivered in one week. Then mockup, artefacts and specs from €8,000 excl. VAT, then from €20,000 excl. VAT for the complete application depending on the scope. The model's usage costs come on top, paid to the provider.

Do you add AI to an existing product?

Yes. We start from your product and your data, isolate a precise use case, and integrate it without rebuilding the rest.

An AI product to scope?

Fifteen minutes is enough to know whether we should work together. The call is free and you leave with an opinion either way.

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