What we collect

Tangmark has no sign-up and no user account. We do not collect your name, email, address, contacts or location, and we do not collect any of the content you save in the app. That content never leaves your device except through an action you take yourself, such as a backup, an export or a document you choose to share.

What Tangmark keeps on your device

Everything you enter is stored in the app's own local database and photo folder on your device:

• Your knives and your other carry, such as flashlights, pens, multitools, watches, sharpeners and sheaths, with their makers, models, steels and other details.
• Photos you attach, and any documents you attach such as a receipt or a warranty card.
• Provenance and ownership details, including serial numbers, where a piece was bought, what it cost, where it is kept and the values you record.
• Your carry rotation and its history, your maintenance and modification entries, and your reminders.
• Disposition records for pieces that have left your collection, including a sale, a trade, a gift, a loss or a theft.
• App settings such as appearance, language, units, base currency, your app lock preference and your cached purchase state.

None of this is transmitted to us. We have no copy of it and no way to read it.

Diagnostics

To find and fix bugs, Tangmark sends anonymous diagnostics. This is on by default and you can turn it off at any time in the app, at Settings → Diagnostics. Nothing is captured or sent once it is off. What a report can contain:

• The app and its version, the platform such as iOS or Android, and the OS version.
• The error type, message and code stack trace.
• Technical log lines, which record what the app did and never anything you typed.
• A layout snapshot, which records the structure of the screen only, with no text and no images.
• Anonymous performance timings, such as app start time, slow or frozen frames, and how long a screen takes to open.

There are no screenshots and no screen recordings, no device identifier, no user identifier, and none of your collection. Reports go to two recipients, both controlled by that one switch:

• A Cloudflare Worker operated by Trueframe Digital, which receives the report above. Your IP address is discarded at ingestion and never stored.
• Sentry (Functional Software, Inc.), running in the EU / Frankfurt region, a crash-diagnostics processor that adds native-crash and crash-free-rate visibility. It receives the crash stack, device and OS information, the performance timings, and an anonymous crash-free session status that is not tied to any person or to a stable device or user identifier. We run it in a privacy-minimal mode: no IP or personal-data collection, no user identity, no session replay and no screenshots. See the Sentry privacy policy.

When diagnostics are off, neither recipient receives anything.

The police report number

If you record that a piece was stolen, Tangmark lets you keep the police report number with it. That number is treated as more sensitive than the rest of the record: it is never written into a shared export or into a transfer record. A full backup, which is for you and stays where you put it, does keep it so that restoring gives you your record back intact.

Camera, photos and app lock

The app asks for camera or photo-library access only when you take or attach a photo, and for notification permission only if you set a maintenance reminder. Photos and files you attach are stored on your device. App Lock, if you turn it on, uses a PIN you choose and your device's own Face ID, Touch ID or fingerprint, and never leaves the device.

Backups, exports and documents

You can save a backup archive of every record and every photo whenever you choose. You can also export your collection as a CSV file, and produce a Collection Inventory Schedule as a PDF, including a redacted copy for sharing that leaves out serial numbers and where each piece is kept. All of these are created only when you ask for one, they go to the location you pick or through your device's normal share sheet, and they are never sent to us. We have no server that receives them.

Purchases

Tangmark Pro is a one-time purchase. There is no subscription anywhere in the app. Payment is handled entirely by the store you installed from, and we never see your card details, billing address or store account. On Apple and Android, purchase status is managed through RevenueCat, our purchase processor, which receives the store receipt, an anonymous app identifier and standard request information so the app can grant and restore your purchase. Details are in the RevenueCat privacy policy. On Windows, the Microsoft Store handles the purchase directly. We never send any of these your collection, photos or values. Tangmark also keeps a local cache of your entitlement so it works offline.

On Apple devices, Universal Purchase and Family Sharing apply where supported: one purchase can cover your other Apple devices and family members signed in to the same account.

Data sharing

We do not sell, rent or share your data, and there are no advertising SDKs and no third-party behavioural-tracking SDKs in the app. The only information that ever leaves your device on its own is the anonymous diagnostics described above. Store purchase processing is handled by the app store and the purchase processor under their own policies.

Your control and deletion

Because your data is stored locally, you are in full control of it. You can delete any piece, photo, entry or record from within the app, or remove everything by deleting the app from your device. Backups and exports you created are managed by you, in the location you saved them.

Children

Tangmark is not directed at children under 13 and does not knowingly collect data from them.

Changes

If this policy changes, we will update this page and the “last updated” date above.

Contact

Questions about this policy? Email [email protected]. You can also read the Tangmark Terms of Use.