Software & Mobile App Development Company in France
French-language mobile, web and AI development for companies in France, designed around CNIL guidance, health-data hosting rules and local payment habits.
- NDA & full IP ownership
- Senior engineers
- Working hours that overlap with France
For French organisations, a digital product has to do more than work: it must speak flawless French, respect a demanding privacy regulator and fit local payment habits. Sigmato is a software development company France-based scale-ups, retailers and industrial groups can engage to design and build mobile apps, web platforms and AI tools. We deliver from our engineering centre in Bengaluru, India, with a branch in the UK, and we work with clients in Paris, Lyon, Marseille and Toulouse. Day-to-day project communication is in English, and every user-facing screen is delivered in French.
The French Tech Landscape We Build For
France combines a large start-up scene, supported by the La French Tech programme and campuses such as Station F, with major industrial and consumer groups. The demand we see most often comes from:
- Paris: fintech, insurtech, luxury and fashion retail, media and B2B SaaS.
- Lyon: life sciences, pharmaceuticals and healthcare software, along with chemical and industrial firms.
- Toulouse: aerospace and space engineering, where suppliers need maintenance tools, documentation portals and data visualisation.
- Marseille: port logistics, shipping and tourism, plus a growing digital sector linked to the city’s subsea cable connections.
RGPD and the CNIL: What French Users Expect
French privacy compliance means the GDPR (known in France as the RGPD) plus the Loi Informatique et Libertés, enforced by the CNIL, one of Europe’s most active regulators. In practice we build for:
- Strict cookie consent. CNIL guidance expects refusing cookies to be as easy as accepting them, with a visible “Tout refuser” option and no tracking before consent.
- Transfers outside the EU. We sign Standard Contractual Clauses and support your transfer impact assessment, keeping production data in EU regions such as Paris.
- Minors. France sets the digital age of consent at 15, so apps aimed at teenagers need parental consent flows below that age.
- Accessibility. Public bodies follow the RGAA reference framework, and since June 2025 many private consumer services fall under European Accessibility Act obligations. We test to WCAG 2.2 AA, which RGAA criteria are based on.
Health Data and Financial Services Rules
Two French sector regimes change the architecture of a product, so we raise them in the first workshop.
- HDS hosting for health data. Personal health data collected for care must be hosted by a provider certified as Hébergeur de Données de Santé, a scheme overseen by the Agence du Numérique en Santé. We deploy telehealth and patient apps on HDS-certified infrastructure; see our telemedicine app development guide.
- ACPR supervision for fintech. Payment institutions, e-money issuers and insurers are authorised and supervised by the ACPR, and the EU’s DORA rules set expectations for ICT risk, outsourcing and incident reporting.
Language Rules and French Localisation
French must be the primary language for consumer-facing products sold in France. The Loi Toubon requires French for product descriptions, user instructions, contracts and advertising aimed at French consumers, so an English-only app is a legal as well as commercial risk. We handle the details that make an app feel native: non-breaking spaces before colons and question marks, guillemets, the euro sign after the amount (12,50 €), formal “vous” copy and text expansion of roughly a fifth compared with English. For Belgian, Swiss or Canadian francophone audiences, we keep regional variants separate.
Payments French Customers Choose
| Payment option | Why it matters in France |
|---|---|
| Cartes Bancaires (CB) | The domestic card scheme, co-badged on most French Visa and Mastercard cards |
| Apple Pay and Google Pay | Fast mobile checkout, widely supported by French banks |
| Paiement en 3 ou 4 fois | Split payments through providers such as Alma, Oney or Klarna |
| PayPal | Trusted for marketplace and cross-border purchases |
| SEPA prélèvement | Direct debit for subscriptions and utilities |
| Wero | The European Payments Initiative wallet replacing Paylib at French banks |
B2B platforms also need to prepare for France’s electronic invoicing reform, which from September 2026 requires businesses to be able to receive e-invoices through approved platforms, with issuing obligations phased in by company size. The French tax administration publishes the timetable. We build integrations with certified platforms so your billing stays compliant.
Services and Mobile Market Fit
Android has the larger share of French smartphones, but iPhone users dominate some premium segments, so we usually recommend a cross-platform build. Our main services are mobile app development, web applications built with Vue, React or Angular, Shopify e-commerce for fashion and beauty brands, and AI-powered applications using EU-hosted models when data must stay in Europe.
Collaboration Hours Between Paris and Bengaluru
India is 3½ hours ahead of France in summer and 4½ hours in winter. Your morning, from roughly 9:00 until lunch, matches our afternoon, which is ideal for daily syncs and sprint reviews. Questions sent in your afternoon are answered first thing in our next morning, before you arrive at the office.
Working With a Software Development Company in France: Budgets
Indicative ranges are US$6,000–US$14,000 for discovery and a clickable prototype, US$28,000–US$80,000 for an app MVP, and US$3,000–US$5,500 per month for a dedicated developer. We can quote in euro, and the final figure depends on scope and compliance needs. Our SaaS development cost guide explains the main variables.
Frequently Asked Questions
Does my health app need HDS-certified hosting?
If it stores personal health data collected in the context of prevention, diagnosis, care or medical follow-up for people in France, generally yes. We confirm the scope with you and deploy on an HDS-certified provider.
Is an English-language app acceptable in France?
For consumers, no. French is required for instructions, terms and marketing, and users expect it. We deliver complete French localisation and can add English as a second language.
Will our cookie banner satisfy the CNIL?
We implement a consent platform with equal accept and reject choices, granular purposes and consent logging, and we block trackers until users agree.
Start Your Project in France
Share your brief or cahier des charges, and we will return a scoped plan and cost range within two working days.