How Much Does Custom Web Application Development Cost in 2026?

This is the question we hear most often. And that makes perfect sense — before committing to a development project, you need to know what you’re getting into financially.

At INYSTER, we prefer transparency over opaque quotes. Here are the realistic price ranges we see on the French market in 2026.

The main price ranges

POC (Proof of Concept): 2,000 — 5,000 EUR

A POC is designed to prove the technical feasibility and business value of an idea. In 2 to 4 weeks, you get a functional prototype that answers the question: “Can this actually work?”

What it includes: requirements scoping, mockups, functional prototype, documentation.

MVP (Minimum Viable Product): 5,000 — 15,000 EUR

The MVP goes further: it’s a simplified but usable version of your application. Robust enough to be tested by real users, lightweight enough to be delivered in 4 to 8 weeks.

What it includes: application architecture, front-end and back-end development, database, deployment, technical documentation.

Full application: 15,000 — 50,000+ EUR

The complete project with all features, integrations, user management, production deployment, and ongoing support.

Timeline varies: from 2 to 6 months depending on complexity.

Factors that affect pricing

Several elements directly influence the final cost:

• Functional complexity: a simple dashboard vs. a multi-role application with approval workflows.
• Integrations: connecting to an ERP, CRM, or third-party API adds work.
• Data volume: an application processing millions of rows requires a different architecture.
• Security requirements: regulated industries (healthcare, finance) mean additional constraints.
• Design: standard interface vs. highly customized design.

Freelancer, agency, or IT consultancy: what’s the impact on price?

Rates vary significantly depending on the type of provider:

• Junior freelancer: 300-500 EUR/day. Attractive pricing, but risk regarding quality and continuity.
• Specialized agency (like INYSTER): 500-800 EUR/day. A dedicated expert contact, in-house development.
• IT consultancy / large firm: 800-1,500 EUR/day. Management overhead, frequent team rotation.

The daily rate is only part of the equation. A senior developer at 700 EUR/day who delivers in 20 days costs less than a junior at 400 EUR/day who takes 50 days — and produces more maintainable code.

Our approach at INYSTER

We consistently recommend starting with a POC before investing in full-scale development. This approach offers several advantages:

• You validate feasibility before committing a large budget.
• The POC is designed with a scalable architecture: when you move to production, we don’t start from scratch.
• You have a concrete deliverable in 2-4 weeks to build internal buy-in.

Conclusion

The budget for a custom web application depends on many factors, but the most common range for an SME falls between 5,000 EUR and 30,000 EUR for a first production version.

The most common mistake isn’t under-budgeting — it’s failing to start with a POC to validate the need before investing heavily.

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