Privacy policy

Last updated: 12 October 2026

Who we are

1% Learning is run by Gareth Stringer, Cäsarstraße 74, 50968 Köln, Germany. We are responsible for your data under the GDPR.

Contact: support@onepercentlearning.com

This policy covers our apps (1% German, and later 1% Spanish, 1% French and 1% Italian) and this website.

What we collect, and why

On your phone only

Your name (if you give one), level, progress, streak and reminder time are saved on your phone. They stay there unless you save your progress to an account.

A guest ID

When you first use the app, it creates a random guest ID. It contains no name or email. We use it so Lisa can mark your answers, and to track fair use: how many times Lisa was used each month and what it cost.

Your answers and questions

When you answer a lesson or ask Lisa a question, the text goes through our server to Anthropic, the AI company whose models power Lisa. We don't store your answers or questions on our servers. Anthropic processes them only to produce Lisa's reply, keeps them for a short time under its own policies, and does not use them to train its models.

Please don't type personal details, such as your address or health information, into your answers.

Your account (if you save your progress)

• Your email address, or your Apple or Google sign-in. With Apple or Google, we receive your email address, a user ID from Apple or Google, and your first name if you choose to share it. With Apple, you can hide your real email.
• Your progress: sentences learnt, scores, words, level and streak.

This lets you keep your progress and use it on another phone.

If you sign in with Apple, we also keep a sign-in token from Apple on our server. We use it only to tell Apple to remove the link to our app when you delete your account.

Subscriptions

Apple or Google handle payment. We never see your card or bank details. Our subscription service, RevenueCat, receives your guest or account ID and your purchase details (plan, dates, status) so the app knows you've subscribed.

Sign-in emails

When you sign in with an email code, our email provider, Resend, receives your email address to send the code.

App updates

Small app updates are delivered by Expo. When the app checks for an update, Expo receives technical details such as your IP address, app version and phone type.

Crash reports

If the app crashes or hits an error, our error-reporting service, Sentry, receives technical details: what went wrong, the app version, phone type and system version, and your guest or account ID. It does not receive your answers or questions. We use this only to find and fix problems.

Daily reminder

The reminder is set on your phone. It works without our servers. You can turn it off in Profile or in your phone's settings.

Emails to support

If you email us, we use your email and message only to help you.

This website

This site is hosted by Cloudflare. Cloudflare processes your IP address to deliver the site and protect it from attacks. The site uses no cookies and no analytics, and its fonts are stored on our own site, not loaded from Google.

Our legal reasons

• To provide the app you asked for (Art. 6(1)(b) GDPR): marking, saving progress, sign-in, subscriptions, support.
• Our legitimate interests (Art. 6(1)(f) GDPR): keeping the service secure, fair use, app updates, and fixing errors.
• Your consent (Art. 6(1)(a) GDPR): the daily reminder, given through your phone's permission.

Who we share data with

Only the services we need to run the app:

• Supabase – our database and server, hosted in Frankfurt, Germany
• Anthropic – AI marking for Lisa
• RevenueCat – subscription status
• Resend – sign-in emails
• Expo – app updates
• Sentry – crash reports
• Cloudflare – website and email forwarding
• Apple and Google – app stores, payments and sign-in

Some of these companies are based in the US. Where data leaves the EU, it is protected by the EU–US Data Privacy Framework or the EU's Standard Contractual Clauses.

How long we keep data

• Your account and progress: until you delete your account. We then delete it within 30 days.
• Fair-use records: up to 12 months.
• Crash reports: up to 90 days.
• Support emails: as long as needed to help you, then deleted.

Your rights

You can ask us to show you the data we hold about you, correct it, delete it, limit how we use it, or give it to you in a common format. You can also object to how we use it, and withdraw consent at any time.

Email support@onepercentlearning.com. We'll reply within one month.

You can also complain to a data protection authority. Ours is the Landesbeauftragte für Datenschutz und Informationsfreiheit Nordrhein-Westfalen (LDI NRW).

Children

Our apps are not aimed at children under 16. If you're under 16, please ask a parent before signing up.

Changes

If we change this policy, we'll update the date at the top. For important changes, we'll tell you in the app.