1. Agreement to these terms

These Terms of Use (“Terms”) are an agreement between you and Trueframe Digital (“we”, “us”) for the Tangmark application and its content (“the app”). By downloading, installing or using the app you agree to these Terms. If you do not agree, do not use the app.

2. Licence

We grant you a personal, non-exclusive, non-transferable, revocable licence to install and use the app on devices you own or control, for your own personal, non-commercial use. Your use is also subject to the rules of the store you obtained the app from, being the Apple App Store, Google Play, or the Microsoft Store. The app is licensed, not sold.

3. Not an appraisal, and not insurance or legal advice

Tangmark is a record-keeping tool. The values you enter, the totals it adds up, and the Collection Inventory Schedule it produces are a record you prepared from your own information. They are not an appraisal, not a valuation by us, and not a statement about what any policy does or does not cover. Whether an insurer, a loss adjuster or anyone else accepts a document you produce is entirely their decision, under their own rules.

The steel reference and the maintenance guidance in the app are general information, gathered from published sources and simplified. They can be incomplete or wrong for a specific blade, and they are not manufacturer instructions. Follow the maker's own guidance for your piece.

Laws about owning, carrying, buying, selling and transporting knives and other carry vary widely by country, state and city, and they change. Nothing in the app is legal advice. You alone are responsible for complying with the law that applies to you, and for handling and storing your pieces safely.

4. Your data is yours

Tangmark is local-first: the information you enter stays on your device, as described in our Privacy Policy. Because of this, you are responsible for your own data, including keeping your own backups. We have no account system and no copy of your data, so we cannot recover it for you. Deleting a record or removing the app from your device erases the data stored there.

5. Tangmark Pro and purchases

Tangmark is free to use with a limit on how many active pieces and photos it holds. Recording your collection, your carry history, CSV export, backup and restore, and looking up a steel are free at every tier. Some features are part of Tangmark Pro, an optional one-time purchase (not a subscription):

• The purchase is made and billed through the app store you installed from (Apple, Google or Microsoft). We never see or store your payment details.
• It is a single payment. There is nothing to renew and nothing to cancel.
• Your purchase unlocks Pro for the store account you bought it with, and you can restore it on your other devices using that same account.
• Prices may vary by region and may change over time; a change does not affect a purchase you have already made.
• Refunds are handled by the app store under its own policies, not by us.

6. Records, schedules and transfer documents

Tangmark can produce a schedule of your collection and a record of a piece that has left it, including a transfer record for a sale, trade or gift. These documents are built from what you entered, so their accuracy is yours. They are not contracts we are a party to, they do not transfer legal title on their own, and we make no representation to any buyer, seller, insurer or authority about them. Recording an item in the app is not proof of ownership.

7. Acceptable use

You agree not to copy (except as the app normally allows), modify, reverse-engineer, decompile or attempt to extract the source code of the app except to the extent that restriction is prohibited by law; not to rent, lease, resell or redistribute it; and not to use it for any unlawful purpose, including recording or transferring anything you are not lawfully entitled to own.

8. Intellectual property

The app, its design, its steel reference content, and the “Tangmark” and “Trueframe Digital” names and marks are owned by Trueframe Digital and protected by law. These Terms do not transfer any of those rights to you. The content you enter remains yours.

9. No warranty

The app is provided “as is” and “as available”, without warranties of any kind, whether express or implied, to the fullest extent permitted by law, including any implied warranties of merchantability, fitness for a particular purpose, accuracy, or non-infringement. We do not warrant that the app will be uninterrupted, error-free, or that any figure or reference it shows is accurate.

10. Limitation of liability

To the maximum extent permitted by law, Trueframe Digital will not be liable for any indirect, incidental, special or consequential damages, or for any loss of data, arising out of or relating to your use of or reliance on the app. Nothing in these Terms limits any liability that cannot be limited under applicable law.

11. Apple App Store

If you obtained the app from the Apple App Store, the following also applies: these Terms are between you and Trueframe Digital only, and not with Apple. Apple has no obligation to provide any maintenance or support for the app. Apple is not responsible for the app or any claims relating to it, including product-liability, legal or regulatory, or intellectual-property claims, or any failure to meet a legal requirement. Apple and its subsidiaries are third-party beneficiaries of these Terms and may enforce them against you.

12. Changes

We may update the app and these Terms from time to time. When we change these Terms we will update this page and the “last updated” date above. Continuing to use the app after a change means you accept the updated Terms.

13. Contact

These Terms are provided by Trueframe Digital, Melbourne, Australia, and are governed by the laws of the State of Victoria, Australia. Any questions about these Terms, or any questions, complaints or claims about the app, can be directed to [email protected].