Custom web application development for SMEs and mid-sized companies that want to work more efficiently

It all depends on how your users work.

Many projects combine both. For CartelOne, photographers use a mobile app in the field, while managers run the business from a web platform.

AI-assisted development, or agentic development, hands the writing of code to AI agents, supervised at every step by experienced developers. It differs from “vibe coding”, where someone with no technical skills generates an application and puts it online without any checks.

Its main advantage is speed, and therefore cost: a first version comes out in a few weeks instead of several months. Its main risk is delivering poorly structured or poorly protected code, which creates bottlenecks as the business grows. That is why, at Kreante, architecture, code review and security stay in the hands of senior developers.

For your company, this means a custom tool becomes available at a budget and within timeframes once reserved for off-the-shelf software.

Yes, provided the code is reviewed, tested and secured by experienced developers. AI writes fast, but it also reproduces common mistakes, such as poorly protected access or exposed data. At Kreante, no change goes into production without a senior developer’s approval.

At Kreante, a first version starts from €3,900, and a complete platform is priced on a custom quote, based on a scope agreed together in writing.

On top of the development budget come running costs after launch: hosting, subscriptions to the tools used, third-party services such as online payment or email delivery, and maintenance. They depend on the number of users and are worth estimating from the scoping stage.

The first deliverable comes very early: a mockup within 48 hours, during scoping, to validate the direction before setting the schedule. As a benchmark, a first version usually takes 4 to 6 weeks, and a complete platform 8 to 12 weeks, depending on scope.

The ability to scale is prepared from the moment the data architecture is designed. At Kreante, we build every application around three requirements: speed, security and the ability to grow.

In practice, this means a well-structured database, a clear separation between the interface and the business logic, and cloud infrastructure that adapts to traffic.

• Personal data protection: as soon as an application collects accounts, contact details or usage data, the GDPR applies. The CNIL (the French data protection authority) publishes a guide for development teams, in 18 practical sheets, that covers every stage of a project^[1];
• Digital accessibility: since 28 June 2025, the European Accessibility Act requires companies to make their websites, applications and digital services accessible to people with disabilities, particularly in e-commerce, transport and banking services. Breaches can be punished with fines and penalty payments of up to €300,000^[2].

These requirements cost far less when they are addressed from the design stage than when an application already online has to be reworked.

The French market brings together very different profiles: traditional development studios, agencies specialising in visual tools and teams that develop with AI.