Privacy Policy
ProofStudy turns your study material into notes, practice questions and flashcards. This page explains what information that involves, who handles it, and how long it is kept.
Who we are
ProofStudy is made by 26Labs, a company registered in the United Kingdom ([OWNER: company number and registered office address]). 26Labs is the controller of the personal information described here. You can contact us at [OWNER: contact email].
What we handle and why
Study material you add
Documents, slides, photos, audio, video and text that you add to the app. We use them only to make your notes, questions and flashcards. When the app needs AI help, it sends the material through our server to an AI provider (see "Who else handles your information"). Our server passes the material on and does not keep a copy of it. An answer may be held in the server's memory for a few minutes so an interrupted request can still be completed.
What the app makes for you
Notes, questions, flashcards, your answers and your progress are stored on your device. We do not keep a copy on our server. They are removed when you delete them or delete the app. Your device backups follow your own iCloud or computer backup settings.
Your subscription and usage
When you subscribe, Apple handles the payment. We never see your card details, name or email address. Apple gives the app a signed record of your subscription. From that record our server works out a random-looking account code that does not name you. Against that code our server keeps a usage record: what kind of request was made, which AI model answered, how much it cost and when. We use it to give you your plan's allowance and to keep spending within safe limits.
Send from computer
If you use "Send from computer", the files you send and their names are kept on our server only until your phone collects them. The 6-character code works for 15 minutes. To stop people from guessing codes, the server counts wrong guesses for each internet address (IP address). Those counts are kept in memory for 15 minutes and are never written to disk. The page uses no cookies and no tracking.
What we do not do
- No advertising, no tracking across apps or websites, and no analytics or advertising tools in the app.
- We do not sell or rent your information.
- Our server keeps no access logs of your requests and never logs the content of your files.
- We do not use your material to train AI models.
Our legal reasons (UK GDPR)
- Providing the service you asked for (contract): processing your study material, making your notes and questions, Send from computer, and your subscription allowance.
- Legitimate interests: keeping the service secure, preventing abuse such as code guessing, and keeping AI spending within safe limits.
- Legal obligations: keeping records we are required to keep by law.
Who else handles your information
| Who | What for | Where |
|---|---|---|
| OpenAI | Reads your material and writes notes, questions and flashcards; reads photos; turns speech into text. | United States |
| Google (Gemini, through Google Cloud) | The same jobs, only when the app's Gemini option is in use. [OWNER: delete this row if the Gemini option does not ship] | United States, European Union and other regions |
| Apple | App Store purchases and subscriptions. Apple decides how it handles payment information under its own privacy policy. | Worldwide |
| Hetzner Online | Hosts our server, including files waiting in Send from computer. | European Union (Finland) |
| Cloudflare | Points the proofstudy.com name at our server. It does not see your files or requests. | Worldwide |
The AI providers handle your material only to answer our requests. Under their business terms they do not use it to train their models. They may keep it for a limited time to detect abuse (OpenAI: up to 30 days). [OWNER: confirm against the current provider terms and any zero-data-retention agreement]
When information goes outside the UK, we rely on the UK's approved safeguards, such as the UK International Data Transfer Addendum or the UK Extension to the EU-US Data Privacy Framework. [OWNER: confirm the safeguard used for each provider]
How long we keep it
| Information | Kept for |
|---|---|
| Study material sent for AI help | Not kept by our server once the request is answered. The AI provider keeps it as described above. |
| Notes, questions, flashcards and progress | On your device until you delete them. |
| Send from computer files | Deleted as soon as your phone collects them, and after 24 hours at most, even if they are never collected. |
| Wrong-code counts (Send from computer) | 15 minutes, in memory only. |
| Usage record (account code, requests, costs) | [OWNER: period, for example the subscription plus 6 years for accounting records] |
Children
ProofStudy is made for students. [OWNER: state the minimum age, and whether users under 18 need a parent's or guardian's consent. This decision is still open.] We design the app to collect as little as possible, with no advertising and no tracking.
Your rights
You can ask to see, correct or delete your personal information. You can also object to or restrict how we use it, and ask for a copy in a portable form. Our server knows you only by a code that does not name you, so we may ask for details from your App Store purchase to find your records. Most of your information is on your own device, and you can delete it there at any time.
If you are unhappy with how we handle your information, please contact us first. You also have the right to complain to the Information Commissioner's Office (ICO) at ico.org.uk or on 0303 123 1113.
Security
All connections use HTTPS. AI provider keys are kept on our server, never in the app. Our server identifies you only by a code that does not name you, and it deletes Send from computer files on a schedule.
Changes
If we change this policy, we will update the date below. For important changes, we will also tell you in the app.