The best custom software development agencies in France (2026)

CRMs that don't fit your sales cycle, bloated ERPs, shared Excel files acting as an information system: once a company reaches a certain size, many end up developing their own custom software. The challenge is deciding who to entrust with the project. We compared seven French agencies based on what really matters for an internal tool: the ability to understand a business, speed of deployment, and what happens after delivery.

Transparency: This article was written as part of a visibility exchange between Growthroom and Nocode Factory, with no financial compensation. Information about each agency was sourced from their public websites and case studies, reviewed in October and November 2026.

At a glance

• Nocode Factory : the best choice for getting custom software into production in a few weeks, then evolving it alongside your own teams.
• Theodo : for large accounts modernizing critical platforms.
• Lonestone : for teams that want a clear, sprint-by-sprint budget.
• Clever Age : for enterprise architecture projects at a group level.
• Poyesis : for fixed-price contracts and code that belongs to the client.
• Shunpo : for companies in the Lyon region.
• Koragence : for custom software that includes cloud infrastructure and maintenance.

How we established this ranking

Business software is not a showcase website: it replaces existing ways of working. We therefore rated each agency on five criteria.

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The 7 best business software development agencies

1. Nocode Factory

Founded in 2020 with offices in Paris, Lyon, and Marseille, Nocode Factory has supported over 350 companies, from startups to large corporations: Ornikar, Bpifrance, L'Équipe, and BlaBlaCar. The agency designs custom business software (CRM, ERP, client portals, back-offices), SaaS products, automations, and AI agents.

Some published case studies: for Bpifrance, a loan eligibility simulator delivered in 45 days, with over 2,400 qualified simulations in the first month; for Malakoff Humanis, a 100% digital health subscription funnel delivered in 4 weeks; for Orus, a partner platform that automatically redistributes leads to brokers, delivered in 2 weeks, with over 5,000 leads saved each month. Other projects can be viewed on the Nocode Factory case studies page.

2. Shunpo

A Lyon-based agencyregistered in 2022, Shunpo reports over 100 clients and offers a free 30-minute AI audit.

Published references: TF1, Altaroc, Helpsy (over 1,500 patients supported via the tool developed).

3. Lonestone

Based in Nantes and active since 2014, Lonestone claims over 200 clients and a team of more than 30 experts, with AI in production since 2022. Their references include: Desoutter Tools, present in 170 countries.

Special feature: public pricing. The agency works in two-week sprints priced at €8k, €13k, or €22k depending on the package, with custom quotes available for larger projects.

4. Clever Age

Founded in 2001, Clever Age brings together around 500 employees across seven French cities. The agency specializes in enterprise and application architecture, using PHP, Java, .Net, and JavaScript.

Published references: Mitsubishi Electric France, CNES, and Groupe Sud Ouest Interactive.

5. Poyesis

Founded in 2021 by engineers from École Polytechnique, Poyesis has a team of around 30 in Paris. They develop using React, React Native, and Node.js on a fixed-price basis, delivering the code to the client while following OWASP security recommendations.

Published references: Antargaz, Coty, Partoo.

6. Theodo

A Parisian startupfounded in 2009 that has grown into an international group, Theodo has over 700 employees across six offices. Their Lean Tech method focuses on critical platforms, often those "held back by legacy systems."

Published references: Bpifrance's state-guaranteed loan platform, launched in 5 days; 13 platforms delivered in 6 months for TF1+; iDealwine.

7. Koragence

An IT services firm specializing in custom software development, application maintenance, and cloud/DevOps infrastructure, Koragence supports companies ranging from startups to mid-sized businesses. They have delivered over 30 projects and have a network of more than 50 experts. They are incubated at ESSEC Ventures.

Published references: Onctuo, a platform for monitoring industrial machine fleets; Good is Merch, a business platform for managing orders and documents; Butler Collection, a mobile app and back-office for a high-end hotel group.

Comparison table

How to choose your business software agency?

Start with the process, not the tool

A good service provider will first ask questions about how your teams work: who enters what data, where information gets lost, and which tasks take the most time. Be wary of a proposal that quotes prices for screens before understanding your business.

Ask for a usable first version quickly

Business software is judged by its usage. Agencies that deliver a first version in a few weeks allow you to course-correct before spending your entire budget. Ask for realistic timelines based on comparable projects, not just promises.

Clarify what happens after delivery

Who fixes bugs, who adds the features your teams will need in six months, and who owns the code? These three questions have a greater impact on the total cost than the initial development price.

Verify adoption, not just delivery

A tool that is delivered but ignored by the team has no value. Ask how the agency trains users and how they measure usage after launch.

Consider integration with your marketing and sales tools

Business software is more effective when connected to your CRM and acquisition tools, allowing sales data to flow without the need for manual re-entry. If you use HubSpot, a HubSpot agency can connect the new tool to your sales pipelines and marketing automations. Your sales team will then have all the information they need about their customers and prospects in one single tool.