Buy&Rent is built by individuals, for individuals. Here are the choices we made, why we made them, and what it means for you.
Rental investment is full of technical jargon: net-net yield, micro-BIC, Censi-Bouvard depreciation... We built a glossary right into the app, with definitions written in plain language. Every technical term in the results is clickable and links to its definition.
We all started somewhere. One of our first testers told us he couldn't understand half the results. The glossary was born that day.
The interface is fully keyboard-navigable. Screen readers (VoiceOver, NVDA, JAWS) can read every section, every result, every button. Colour contrasts meet WCAG AA guidelines. Dark mode isn't just aesthetic: it reduces eye strain for photosensitive users.
Web accessibility is not optional. A financial tool that excludes users because of its interface isn't doing its job.
Location data comes from INSEE, property transactions from the DVF database (published by DGFiP), environmental risks from Géorisques. Every source is cited in the results. Tax formulas follow the current French General Tax Code.
When you're making a 200,000 euro decision, you deserve to know where the numbers come from. We're not asking you to take our word for it.
The entire infrastructure (frontend, backend, database) is hosted by OVHcloud in datacentres located in France. No data passes through American or non-European servers. We don't resell anything, we don't share anything with advertising third parties. Processing complies with GDPR.
Your simulations contain your income, borrowing capacity, and tax situation. This is sensitive data. It deserves better than a server on the other side of the world.
The interface is available in French, English, German, Dutch, Spanish, Italian and Portuguese. Every text, every tooltip, every error message is translated. The glossary too.
Expats investing in France, cross-border workers, dual nationals: we received requests from the very first weeks. Limiting the tool to French only meant excluding part of the investors.
OVHcloud uses a watercooling system that reduces the energy consumption of its datacentres. Their French facilities run on the French electricity mix, one of the most decarbonised in Europe thanks to nuclear and renewables. We also chose to limit unnecessary client-side requests: aggressive caching, no third-party tracking, no ad scripts running in the background.
We won't pretend a website saves the planet. But between hosting in the US on coal and hosting in France on nuclear-renewable, the choice was straightforward.
No fabricated 'Only 3 spots left!'. No pop-up preventing you from closing the page. No dark patterns to force you into a paid plan. The free tier lets you run real analyses, not a crippled demo that's useless. The limits of each plan are clearly displayed before purchase.
We hate these practices as users ourselves. We're not going to inflict them on our own users.
Buy&Rent relies on dozens of open-source libraries maintained voluntarily by developers worldwide. We don't make money off their work, and we don't pretend otherwise. Our way of giving back: we created and published @buyandrent/react-fr, an open-source package of React components specialised for French address and location forms. It's free, tracking-free, and usable by any project.
We use free code every day. The least we can do is contribute back. Open source isn't a self-service buffet: it's an ecosystem, and we want to be part of it.