About
Who makes Geode
Geode is made by one person, Benjamin Repingon, in Sommières, in the south of France. Every message you send is read by the person who builds the app.
Why I built Geode
The complaint that comes up most about stone-identification apps is a name given with total confidence — and the wrong one. I wanted an app built the other way round: one that says how sure it is, shows the other candidates when a photo cannot settle it, and points you to the test that will.
I also wanted it to be straight about money: free identifications every week, with no account; the prices on this site before you download anything; no ads; nothing about you sold.
And I wanted a name to be where curiosity starts rather than where it stops: every sheet tells how the stone formed, where it is found, and what people have long made of it.
When it gets a stone wrong, tell me: that is how it gets better.
How an identification works
When you photograph a stone, the picture is sent, encrypted, to Google's Gemini vision model. It reads the colour, the lustre, the texture and the crystal habit, and proposes the most likely mineral.
Geode then says how sure it is — very likely, possible or uncertain — and lists the other matches when a photo cannot settle it. Every sheet gives you the markers to check the answer yourself, starting with hardness and density.
The photo stays on your phone. It is never stored on our servers unless you switch on the backup, and it is never used to train a model.
What Geode will not do
It is not an appraisal. It will not put a price on a stone or certify that it is genuine: that takes a gemmologist, and often a laboratory.
Some decisive tests — hardness, density, reaction to vinegar — cannot be seen in a photograph. When a picture is not enough, the app says so rather than deciding for you.
The crystal-lore pages describe what stones have long stood for, as cultural heritage. They are never medical advice.
How it pays for itself
Geode is paid for by its subscription: there are no ads, and nothing about you is ever sold.
You can use it free every week, with no account. If you subscribe, Apple or Google bills you; the full conditions are on the terms page.
Writing in
A wrong identification, an idea, a subscription that will not open: it all lands in one inbox, at identify-suite@revely.tech, and Benjamin reads every message. Reports of wrong identifications are read one by one, and they are what the app gets corrected from.
Publisher details — business registration, VAT number, postal address — are on the legal notice.