Mobile apps your customers keep.

An app costs more than a website, so it has to serve a precise purpose: booking, ordering, tracking, coming back. We start from that purpose. We build the smallest version that serves it, and add the rest once it runs.

You have an app idea and three quotes that have nothing in common. Nobody told you what to build first. Your provider talks about technologies instead of your users.

Every app starts with a list that is too long. Accounts, messaging, payments, notifications, sharing, offline mode: everything looks essential on day one. We go through that list with you, line by line. For each item, we ask whether a user will need it in their first week.

The first version keeps what serves the app's reason to exist, and nothing else. The rest is not dropped: it waits until real users ask for it, and it will be better designed then. That is also how a first version stays within budget, from €15,000. A full app is more likely between €30,000 and €60,000.

For StreetFoot, we built the iOS and Android app and the website that presents it. Its new version is coming soon to the stores. For Renard des Surfaces, we handled everything from start to finish, including the social media that goes with the app.

We build an iOS and Android app from a single codebase, with the technology that best fits the project and its needs. Screens, logic and server calls are written once. Every fix goes to both systems at the same time.

Some features sit very close to the phone: Bluetooth, sensors, contactless payment. They sometimes need code specific to each system, so more time. We spot them during scoping, so they are priced from the start.

William develops the app and the backend that runs it. Lumbe designs the screens to match your brand, thinking of the thumb rather than the mouse: buttons within reach, text readable in full sun. Guillaume steps in when the app needs 3D or game mechanics, a field he knows from video game development. They work on the same project, and you do not have to connect them.

A published app is never quite finished. Apple and Google review every version before putting it online, and sometimes reject it over a listing detail or a poorly justified permission. We prepare the listings carefully, screenshots and text included. And we handle the back-and-forth with both stores until approval.

Every year, iOS and Android release a new version. An app that is never updated ends up displaying badly, then dropping in store search. We tell you in advance what those updates will require, so you can plan for them. App maintenance starts at €150 a month.

Then we measure what people actually do in the app: the screens they open, the ones they leave straight away, the features nobody touches. Usage analytics are installed at release. The second version is decided on those numbers. It is the one that turns a downloaded app into an app people keep on their home screen.

• Branding and design
• Web development
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