Proofday Privacy Policy
The short version: Proofday has no accounts, no ads, no usage analytics and no tracking. Your starters, bakes and photos stay on your iPhone. What leaves it is a Crumb Check, only when you ask for one, and the App Store's record of your subscription, which our subscription service keeps.
What stays on your iPhone
Your starters, feedings, rise photos, bake plans, journal entries, loaf and crumb photos, and settings are stored in the app's own storage on your iPhone. The Proofday widgets and Live Activities read a short summary of your next step from that same device. None of it is uploaded to us, and we can't see it.
Like other app data, it is included in your iPhone's iCloud or computer backups, which Apple encrypts and controls. There is no separate Proofday account or cloud copy. Deleting the app deletes the data.
Network requests the app makes
- Crumb Check, only when you tap "Check my crumb". Described in full below.
- Apple's App Attest service, the first time you run a Crumb Check, so our server can tell that a request comes from a genuine copy of the app. Apple runs this check; it doesn't identify you to us.
- The App Store, through Apple's StoreKit, to show subscription prices and check whether your subscription is active.
- RevenueCat, the service that manages Proofday's subscriptions. Described under Purchases below.
Nothing else. The app has no usage analytics or advertising code.
Crumb Check
When you ask for a Crumb Check, the app shows you exactly what it will send, then sends:
- the photos you chose (a cut loaf, and optionally its outside), reduced to at most 1024 pixels on the long side;
- that bake's numbers: recipe name, hydration, levain percentage, kitchen and dough temperatures, bulk time, the aliquot's rise and target, cold proof and bake times, and any notes you added to the bake as changes.
These go to a server we operate, which passes them to an AI model from Anthropic and sends the analysis back to your phone. Our server does not save the photos, the numbers or the analysis, and its logs record only that an error happened, never what you sent. The result is saved on your iPhone with that bake.
Anthropic receives the request through its commercial API. Under its terms it does not use API data to train its models, and it keeps requests only for a limited time under its own policies, for example to detect misuse. See Anthropic's privacy policy.
To keep the service from being abused, our server keeps two things:
- the public key of an App Attest key that your iPhone created for this app. It changes if you reinstall the app and is not linked to your name, Apple Account or device serial number;
- a count of Crumb Checks per day for that key, to apply a daily limit. Counts older than a week are deleted.
As with any request over the internet, our server and its hosting provider can see the network address a request comes from. We don't store it with your photos or numbers and don't use it to identify you.
Crumb Check never judges whether bread or a starter is safe to eat.
Camera and photos
Proofday asks for the camera to photograph your starter jar and your bread, and lets you pick photos from your library. Photos are only used where you put them: to measure a rise, for a bake's journal entry, or for a Crumb Check you ask for.
Notifications
Bake and starter reminders are scheduled on your iPhone. Their content never passes through our server.
Purchases
Subscriptions are sold and billed by Apple. We never see your payment details. Manage or cancel a subscription in Settings › your name › Subscriptions.
To manage subscriptions we use RevenueCat, which receives the App Store's record of your purchases (which plan, when it started, renewed or ended, the price and the store country) together with a random ID this app creates for you. It doesn't receive your name, email address or Apple Account, nothing you log in the app, and no photos. We use it to know whether your subscription is active and to see, in aggregate, how many people start a trial and keep their subscription.
Children
Proofday is not directed at children under 13 and does not knowingly collect information from them.
Changes
If what the app does with data changes, this page changes first, with a new date at the top.
Contact
Questions about this policy: privacy@treamz.me