Privacy policy

Who we are

The Mathtrace app and this website are operated by Petr Kučera, Company ID (IČO) 67582443, Czech Republic, who is the controller of your personal data. Contact: support@mathtrace.app.

In short

• You don't need an account – we don't ask for your name, email or phone number.
• No ads, no tracking, no analytics.
• A photo is used only to read the problem and isn't stored.
• We store math problems and their solutions, not information about people.

What the app processes

• The photo of a problem – sent over an encrypted connection to our server and to the Mathpix recognition service, which reads the problem from it. We don't keep the photo, only its checksum (a short fingerprint from which the photo can't be reconstructed), so the same photo is recognized again without sending it to Mathpix a second time. Mathpix is asked not to store the photo either. Tip: crop the photo to the problem itself.
• The problem and its solution – the recognized or typed problem, your edits, the result, the steps and how confident the recognition was, with the time. They're needed to show you the result and help us improve the app. They aren't linked to you – the app has no account or device identifier.
• Problems the app couldn't solve – the problem itself, so we know what to add or fix.
• Solved problems – a problem with its result is kept so the same problem is answered faster next time.
• Technical data – like any internet service, our server sees the IP address of the request. Our hosting providers keep it in operational logs for a short time for security and operation; we don't use it to identify anyone.
• On your device – the app's settings are stored only in your phone.

Why and on what legal basis

To provide the service you ask for – recognizing and solving a problem (Art. 6(1)(b) GDPR) – and for our legitimate interest in running the app securely and improving it (Art. 6(1)(f) GDPR).

Who else processes the data

We use these providers, who process data only on our behalf:

• Mathpix, Inc. (USA) – recognizing the problem in a photo
• Render Services, Inc. (USA) – the app's server
• Neon (Databricks, Inc., USA) – the database
• Cloudflare, Inc. (USA) – this website and email delivery

Transfers outside the EU rely on the safeguards required by the GDPR, such as the EU–US Data Privacy Framework or the European Commission's standard contractual clauses. We don't sell or share data with anyone else.

How long we keep it

Photos aren't stored. Problems and their solutions are kept as long as they're useful for running and improving the app – they don't identify anyone. Operational logs are kept for a short time by the hosting providers.

This website

The website uses no cookies, no analytics and no third-party scripts. Cloudflare processes the IP address of each visit in order to deliver the website and protect it from attacks.

Children

Mathtrace is intended for secondary school and university students and adults. Younger children should use it with a parent's consent. We don't knowingly collect personal data about children.

Your rights

You have the right to access your personal data, to have it corrected or erased, to restrict its processing, to object to processing and to data portability. Because we don't link data to people, we may not be able to find yours without more details – please tell us what you entered and when. Write to support@mathtrace.app.

You can also lodge a complaint with the supervisory authority – in the Czech Republic, the Office for Personal Data Protection (uoou.gov.cz), or the authority in your own country.

Changes

If anything here changes, we'll update this page; the date at the top shows the last change.