Appup, web agency in Belfort, France: custom websites, mobile apps and CRMs

Custom websites, apps, CRMs and AI, from the Territoire de Belfort.

We build the tools
that help your business grow.

Based in the Territoire de Belfort, we build custom websites and mobile apps, CRMs and business tools, online payments and artificial intelligence solutions. For companies in Belfort, Montbéliard and the Swiss Jura, we master the entire chain, from the first prototype to production.

See what we can do
Appup, des outils digitaux qui font grandir les entreprises

Custom AI integration for your business.

We integrate AI where it brings real value to your business, never for show: conversational agents, business automation, document processing and tailored recommendations.

Discover our AI solutions
Custom artificial intelligence for companies in Belfort and Montbéliard, by Appup
Short-term rental platforms built by Appup
Short-term rental

Softwareforshort-termrentalsandpropertymanagers

From deposits to payment splitting, from guest guides to channel managers, we design and integrate the building blocks that power short-term rental businesses. PMS, deposits, e-signature, owner payouts, live headcount: we master the ecosystem and its integrations, Beds24, Stripe, Airbnb, Booking.

Let's talk about your project
AWS
Stripe
OpenAI
Claude
ElevenLabs
Twilio
Cloudflare
Google
SMSFactor
Brevo
Beds24
Smoobu
Airbnb
Booking
AWS
Stripe
OpenAI
Claude
ElevenLabs
Twilio
Cloudflare
Google
SMSFactor
Brevo
Beds24
Smoobu
Airbnb
Booking

A human-sized web agency

In the Territoire de Belfort.

A single point of contact for every client

We're not a website factory. Based in Morvillars, between Belfort, Montbéliard and the Swiss border, we follow every client with a dedicated contact who knows their project inside out. We stay reachable, we adapt, and we invest in every case.

On the technical side, we've got it covered. But it's the quality of the relationship that makes the real difference. We build long-term partnerships, not projects forgotten once delivered.

Discover the agency

Solutions designed to convert

Not just to exist.

Custom websites and tools, never recycled

Every line of code meets a real need of your business. We start from the way you work and build the tool around it: custom development, from the first mockup to production.

Let's talk about your project

Certified Stripe experts

Payment solution integration.

Secure online payments, tailored to your model

Stripe, subscriptions, marketplace, pay-on-demand: we set up the payment system that fits your model exactly. Secure, smooth and compliant with online payment standards: PSD2 strong customer authentication, and card data never stored on your side.

Learn more

The tools we use every day

AWS
Stripe
OpenAI
Claude
ElevenLabs
Twilio
Cloudflare
Google
SMSFactor
Brevo
Beds24
Smoobu
Airbnb
Booking
AWS
Stripe
OpenAI
Claude
ElevenLabs
Twilio
Cloudflare
Google
SMSFactor
Brevo
Beds24
Smoobu
Airbnb
Booking

Based in the Territoire de Belfort, working far beyond.

We work with companies in Belfort, Greater Belfort, Montbéliard and the Pays de Montbéliard, as well as the Swiss Jura, from Porrentruy to Delémont. Our work also reaches the rest of France, Morocco, the USA and all the way to Thailand.