TRANSPARENCYIf it's free, are you the product?
No. Here, in plain language: how Plumm makes a living, what we collect, and what we'll never do.
Model: premium, never your data
Plumm will be funded by an optional premium plan. Not by ads, not by data resale.
Transparent algorithm
Our prediction method and its clinical sources are published on our Science page.
Public roadmap
We say what we're building. You can follow along.
How Plumm makes a living
Today, Plumm is free. Zero revenue, zero ads, zero resale.
A future Plumm+ plan (paid, optional) is in the works: it unlocks advanced features without ever locking what's already free. Clear pricing in-app, payment via the App Store or Google Play, no subscription traps.
That's our only model. No ads, no brand deals, no data resale. Ever.
What we'll never do
- Sell, rent or share your data (advertiser, insurer, employer, government). No exception.
- Put targeted ads in the app.
- Add a tracker (Google Analytics, Facebook Pixel…).
- Trap you with dark patterns to make you pay.
- Hide our subprocessors or their country.
What we collect (and don't)
We do NOT collect (by default): • your cycle data: it stays on your phone (unless you enable cloud backup) • your IP: we retain none; our host technically logs requests to the site, as any host does • your cookies, your advertising identifier • any usage metric
We collect only if you enable an option: • messaging / idea board: the content of your messages, an anonymous device identifier, a notification token; for the idea board, your ideas/votes/comments (public) and your first name • cloud backup: an encrypted copy of your cycle data + your account email • website contact form: your first name, your address and your message (+ a 2-hour fingerprint, to limit repeated submissions)
All the detail on the Security page.
Our roadmap
What's available and what we're preparing: • ✅ App Store: Plumm is available on iPhone in France. • Google Play: coming soon to Android. • ✅ PIN / Face ID: shipped: you can lock the app with a passcode or your face. • ✅ Opt-in cloud backup: so you don't lose your data when changing phones (shipped; optional, off by default, and deletable in one tap). • Plumm+: optional paid plan (date TBD).
We update this list as we go.
Our algorithm, in the open
Plumm's prediction method is detailed on our Science page: how it works, the 8 clinical signals it reads, and the sources behind each one. The source code isn't public, the methodology is. A question? Email hello@plumm-app.com, we reply.
It's the minimum when you ask people to trust you with their health data.
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