Independent app studio · is4ai.com

We build useful apps.
Some we sell, others we give away.

IS4AI designs, builds and runs its own apps. Paid products, sold to businesses, fund free apps offered to communities. Same workshop, same tests, same infrastructure. Only the model changes.

The free track is funded by subscriptions, not by advertising, and not by your data.

Studio
Independent
Tracks
For profit · Not for profit
Based in
France
IS4AI's two tracks From the studio, a for-profit track leads to AgentRewire, a not-for-profit track leads to Minbar, and a third, dotted track stays open for the next app. IS4AI FOR PROFIT AgentRewire AI agents for small firms next app… Minbar Qur'an · free, no ads NOT FOR PROFIT
Apps, one per track
2
AI agent models
12
Surahs per recitation
114
Languages in Minbar
3
Ads in our apps
0

The model

How the money flows

A simple loop: businesses pay for a service that earns them money, and that revenue keeps alive apps nobody else would fund.

Businesses · for-profit track

They pay a subscription

Tradespeople, small firms and freelancers subscribe to AgentRewire, from €50 a month with no long-term commitment, or order an agent built for their trade.

IS4AI · the workshop

It builds and maintains

The same workshop, the same infrastructure and the same tests for both tracks. What subscriptions bring in pays for the time and servers of the free track.

Communities · not-for-profit track

They receive for free

Apps like Minbar: free, ad-free, no account needed, for needs the market serves badly.

What stays out of the loop: advertising selling data

Apps

The catalogue

What the studio runs today, and the two doors left open for what comes next. Filter by track or by platform.

For profit B2B SaaS · France

AgentRewire

“You have better things to do. The agent takes care of it.”

A catalogue of AI agents for French tradespeople, small firms and freelancers: they answer the phone around the clock, reply to questions, book appointments and chase quotes. When an agent is unsure, it promises a callback instead of improvising.

Answers
On the 3rd ring, 24/7
Catalogue
12 agent models: 2 available today, 10 made to order, prototyped within 2 weeks
Price
From €50 a month, cancel any month
Data
Hosted in the European Union, in Helsinki
Platforms
Web console, client area, mobile app
Visit agentrewire.com
AgentRewire · real screens, demo data
The Conversations screen of AgentRewire's client area, in the light theme (in French): calls, reviews and text messages handled by Plomberie Martin's agents, each with its summary and status, handled or transferred.
Conversations · light
A call transcript in AgentRewire's client area, in the dark theme (in French): the agent introduces itself as Plomberie Martin's AI assistant, books an appointment for 9 am the next day and sends the confirmation by text message.
Transcript · dark
Not for profit Free · no ads · no account

Minbar منبر

Calm Qur'an listening.

A Qur'an recitation app for French-speaking Muslims in Europe: one surah per tap, resumed where you left it, and available offline. No queue, no autoplay, no ads.

Content
All 114 surahs per recitation · Hafs, Warsh and Qalun riwayat
Languages
French, Arabic (full right-to-left), English
Offline
Downloads, installable web app
Platforms
Android and web · version 0.1.0, October 2026
Privacy
No account, no analytics, no data collected
Write to us about Minbar
Minbar · real screens
Minbar's home screen in the dark theme, in French: reciter Al-Minshawi, a Listen button and the list of surahs.
Dark · French
The same Minbar screen in the light theme, in Arabic, laid out right to left.
Light · Arabic (RTL)

Principles

Our rules, as you'll find them in the code

A numbered catalogue, not a list of values. Each rule points to the app where you can check it today.

01 Foundation

One workshop, two tracks

The track is chosen on day one. It decides the business model, never the level of care, testing or infrastructure.

Both
02 Truth

Only say what we know

An agent answers from the client's own fact sheet, and nothing else. Outside it, the agent takes the caller's details and promises a callback.

AgentRewire
03 Availability

Offline first

Downloads, caching and an installable web app: listening goes on when the network stops.

Minbar
04 Contract

One contract, one source

The API contract is generated from the server. If it drifts, the build breaks, not the client's screen.

AgentRewire
05 Transparency

Nothing silent

Content is only withdrawn by a signed document (Ed25519): visible, time-limited, never on the quiet.

Minbar
06 Sovereignty

Data in Europe

Servers, databases and backups are hosted in Helsinki, in the European Union. Production refuses to start without its secrets.

AgentRewire
07 Service

Serve, don't capture

No ads, no queue, no autoplay: one surah per tap, then silence.

Minbar
08 Discretion

No audio kept

On the phone, the agent works on text: no recording is stored, and conversation content is deleted after 30 days by default.

AgentRewire
09 Privacy

Nothing to collect

No account, no analytics: the library, lists and resume points stay on the listener's device.

Minbar

Questions

What people ask us

Why pay, if some of your apps are free?

The two tracks don't serve the same people. Businesses pay for a service that saves them time and wins them customers. The free apps answer community needs nobody funds. One side's subscriptions make the other side possible.

Where is the data, and what do you keep?

For AgentRewire: on servers in Helsinki, in the European Union. No call audio is kept, and conversation content is deleted after 30 days by default. The details are on AgentRewire's privacy page (in French). Minbar asks for no account and collects no data.

Do you build custom software?

Yes, as agents: we build the script, the messages and the connections to your tools around your trade. A prototype is ready within two weeks, then the agent runs on AgentRewire like the ones in the catalogue.

How do I suggest a cause for the not-for-profit track?

Describe the need, the people it concerns and what is missing today, at the address below. We take on projects where a small, well-made app changes something, and that the market has no interest in serving.

Contact

A project, a cause, a question?

A business that wants to automate its front desk, an association looking for a tool, or plain curiosity: write to us. We read French and English.

For businesses

An automated phone front desk, made-to-order agents, connections to your business tools.

For associations

A tool your community needs that the market serves badly. Tell us what's missing.

For the curious

A question about an app, a technical detail, a typo: write to us.