Last updated: September 3, 2026
Formula Log is a client-formula log for colorists. This policy explains what data the app handles. In short: Formula Log has no server, no accounts, and collects nothing.
None. Formula Log has no sign-in, no analytics, no advertising, and no tracking of any kind. We do not collect, transmit, or sell any personal information. Your formulas are backed up to your own iCloud, which is between you and Apple — we never receive a copy and cannot read it.
Client names, formulas, notes, and before/after photos are stored on your device and, once the iCloud backup is switched on for your account, mirrored to your own private iCloud database, so a lost or broken phone doesn't take your book with it. That copy lives in your Apple account: only your devices, signed in with your Apple ID, can read it. We cannot. Nothing is sent anywhere else.
Camera access is used only to capture before/after photos you attach to a visit. Photos are stored with the record on your device, and go to your own iCloud with everything else once that backup is switched on — never sent to us, and never shared with any third party.
Three things protect your book, and none of them involve us. Once the iCloud backup is switched on for your account, your work mirrors to your own iCloud automatically. The app also keeps recent snapshots on the device itself. And you can export a CSV, JSON, or PDF file at any time and put it wherever you like. If iCloud is switched off, signed out, or out of space, the app tells you on the Backup screen instead of failing quietly — and your work stays safe on the phone in the meantime.
Formula Log's one-time purchase is processed entirely by Apple through the App Store. We never see or store your payment information. Apple's handling of purchases is governed by Apple's Privacy Policy.
The only thing Formula Log sends over the network is your own data going to your own iCloud, handled by Apple. There are no third-party analytics, advertising, or tracking SDKs, and no requests to any server of ours — we don't run one.
A client or formula you delete goes to the app's Trash, where you can restore it for 30 days; after that the app erases it for good. The app also keeps a few recent snapshots of your book on the device so a crash can't lose it — each new snapshot replaces the oldest.
Deleting the app removes the copy on that device. The iCloud copy is yours to remove at any time: open the iOS Settings app, tap your name, then iCloud → Manage Account Storage → Formula Log → Delete Data (the exact path moves between iOS versions — look for iCloud storage, then Formula Log). Nothing is retained anywhere else, because there is nowhere else.
Where your iCloud data is physically stored is determined by Apple and your Apple account, not by us.
When you record a client in Formula Log, you — not us — are the data controller for that information under the GDPR, the Korean Personal Information Protection Act, and equivalent laws. We supply the software: the app runs on your device and mirrors to your own iCloud, and we never receive, access, or process what you enter. That means we are not your processor, and there is no data-processing agreement to sign with us.
What that leaves with you: telling clients you keep their details and photos, having a lawful basis for it, and honouring requests to see or delete what you hold. If you record anything about a client's health — an allergy, a patch-test result, a scalp reaction, a pregnancy — that is sensitive data in the EU and the UK and 민감정보 under Korean law, and it normally needs the client's explicit consent.
Everything you need to act on those requests is in the app: any client, formula, photo, or note can be deleted, and Export gives you the full record of what you hold for a client in a file you can hand over.
On photos specifically: the app stores them as pictures. It never scans them, never detects or matches a face, and never derives anything from them — so they are not biometric data. Ask your client before you photograph them, and check what a share card or export contains before you send it.
Formula Log does not knowingly collect any data from anyone, including children under 13.
If this policy changes, the updated version will be posted at this URL with a new "Last updated" date.
Questions about privacy: yeonwoo@kulvo.io