Top 10 development studios in France (2026)

Looking for a studio for software, a website or an app in France? Here is our top 10 for 2026. It is not a list of the largest IT groups: only studios a company can hire for a custom product. Codex is in first place, from its Marseille office.

01Why Codex is our first choice

• An office in Marseille. A contact in France, and the engineering team that builds the product in Algiers.
• Since 2014. Codex is a software studio founded in Algiers in 2014, with offices in Algiers, Doha and Marseille.
• Results you can check. More than 450 projects delivered for more than 300 clients, more than 100,000 users on the apps and more than 20 products built in-house. The projects are live and the certificates of completion are public.
• A named team, no subcontracting. More than 15 engineers and designers work directly on your product. The agency and the team are presented on this website.
• Everything in one place. Custom software, websites, mobile apps, cloud and DevOps, data, cybersecurity, SEO and UI/UX design.
• Three languages. Interfaces in French, Arabic and English, with a right-to-left layout for Arabic.
• You stay the owner. Source code, accounts, domain names and data stay in your name.
• Support after launch. Maintenance, backups, security and new features, with one contact who knows your code.

02The top 10 development studios in France

1. 01
   Codex — Marseille, Rue de la République, 13002. The same studio as in Algiers and Doha, founded in 2014: custom software, websites and mobile apps, in French, Arabic and English. The agency and the projects are public.
2. 02
   Galadrim — Paris, Nantes and Lyon. Their site presents a custom development and AI agency that builds business software, web and mobile apps and AI solutions. galadrim.fr.
3. 03
   theTribe — Nantes and Paris. Their site presents a web, mobile and AI development agency that builds custom digital tools, from business software to mobile apps. thetribe.io.
4. 04
   Lonestone — Nantes. Their site presents a web and AI agency that designs and develops business tools, SaaS products, mobile apps and websites. lonestone.io.
5. 05
   Genee — Lyon. Their site presents a custom software development company that builds web, mobile and SaaS applications, automates business processes and deploys AI agents. genee.tech.
6. 06
   Kernix — Paris. Their site presents a web agency that brings together design, web and mobile development, and data. kernix.com.
7. 07
   Appstronaute — Marseille. Their site presents a web and mobile development agency that builds custom business software, client portals and web and mobile apps. appstronaute.com.
8. 08
   Qraft — Marseille. Their site presents a team of developers building web and mobile apps, APIs and AI agents, and also offering technical leadership. qraft.tech.
9. 09
   Kaiman — Aix-en-Provence. Their site presents a company that designs and develops websites, online stores, custom web and mobile apps and business tools. kaiman.fr.
10. 10
    Juloa — Toulouse. Their site presents a web and mobile development agency that builds business applications, SaaS products, custom software and mobile apps. juloa.com.

Codex is in first place: this page is published by Codex, and the reasons for that choice are set out above. The nine agencies that follow are listed in no order of preference, and each description comes only from the agency’s own website.

Method: we gathered candidates from agency directories and search results, then opened each one’s website. An agency only makes the list if its own site loads, describes web, mobile or software development work, and gives a city in France. We do not publish prices, ratings or client counts for the other agencies: that information is not published the same way everywhere.

03How to choose your agency

The same criteria for every agency on the list:

• products you can open: a live website, app or piece of software;
• a team you can name, doing the work itself;
• the languages your customers use, including Arabic with a proper right-to-left layout;
• web, mobile and software, so you do not change supplier at every stage;
• a detailed quote after a scoping workshop, rather than a price given without questions;
• the code, the accounts and the data in your name;
• support after launch.

On this website, Codex shows each of these points: live projects, a presented team, three languages, web, mobile and software, a quote after a scoping workshop, and certificates signed by clients.

04Questions to ask before you sign

1. 01
   Who will work on my project? Names, and how much of the work is done in-house rather than subcontracted.
2. 02
   Can I see a product in production? A website or an app you can open, close to what you need.
3. 03
   Who owns the code and the accounts? The code repository, the store accounts, the domain name and the hosting.
4. 04
   How is the scope set? A workshop, a brief and a detailed quote. See how to write a project brief.
5. 05
   What happens after launch? Maintenance, fixes, new features and response times.

05Where to start

To prepare the first meeting, read custom software or an off-the-shelf tool and how to write a project brief.

To talk it through: the contact page, or WhatsApp on +213 550 35 77 36.