AILingo Privacy Policy

Last updated: August 4, 2026

This privacy policy describes how AILingo (“the app”, “we”, “us”) handles information when you use the app.

AILingo is an Android app that teaches practical AI skills through gamified lessons. It is built and maintained by a single developer as an independent project.

Information we collect

1. Course progress

Your lesson progress, exercise answers, XP, level, streak, hearts, daily goals, and earned badges are stored on your device.

If you sign in with Google (optional), your learning progress (such as completed lessons, XP, badges, and goal settings) is also synced to our server and linked to your Google account, so it can be restored on a new device. Some items — such as your current free hearts — remain device-local and are never synced.

If you never sign in, your progress stays on your device only, and uninstalling the app deletes it.

2. Google Sign-In (optional)

You do not need an account to learn. If you choose to sign in with Google, we receive your Google account identifier and basic profile information (such as your email address) from Google. We use this to:

• link your purchases (AI credits, heart packs, and the Plus subscription) to your account so they survive reinstalling the app or switching devices;
• sync your learning progress across devices, as described above.

We do not use your email address for marketing, and we do not share it with third parties.

If you use the app without signing in, requests to our server are identified by Firebase Anonymous Authentication — a random, anonymous identifier for your app installation that is not linked to your name, email, or Google account.

3. Prompt Lab AI grading

Prompt Lab grades the prompt text you write using a real AI model on our backend. This feature:

• Sends the text you write and submit for a given challenge to our grading server, together with the technical fields needed to process the request (such as the challenge ID and app version).
• Does not send your contacts, files, or any other content from your device.
• Is transmitted over encrypted HTTPS to a Cloud Run server we operate.
• May automatically screen submissions for abuse and policy violations. These checks log a classification result — never the prompt text itself.

Submitted prompt text is used only to grade your submission and is not used to train AI models — by us or by the AI model provider. We do not log or store the full text of your submissions in routine server logs. A small number of technical fields (request ID, timestamps, challenge/rubric version, grading outcome, token counts, error codes) are retained for reliability and abuse prevention, with the prompt text itself excluded by default.

Every Prompt Lab result is clearly labeled as either live (graded by the AI backend) or demo (graded offline on your device).

4. Purchases and subscriptions

AILingo offers optional in-app purchases (AI-credit packs and heart packs) and an optional AILingo Plus subscription. All payments are processed by Google Play; we never receive your card number or other payment details.

To deliver what you bought and prevent fraud, our server receives purchase confirmations (purchase tokens) from Google Play, verifies them with Google, and keeps a record of your purchased items and subscription status linked to your account. This record is what allows purchases to be restored when you sign in on a new device.

5. What we do not collect

• We do not use analytics or crash-reporting SDKs.
• We do not access your contacts, location, camera, microphone, photos, or files.
• We do not collect your payment details (Google Play processes all payments).

Advertising

AILingo shows rewarded ads via Google AdMob: optional, user-initiated video ads you may choose to watch in exchange for a bonus, such as extra hearts, a hint, or additional AI grading. Declining simply means you don’t receive the bonus. There are currently no banner or interstitial ads; if that changes, this policy will be updated first.

About ad data:

• AdMob, as the ad network, collects data needed to serve and measure ads, which can include your advertising ID, general device information, approximate location, and ad-interaction data, subject to Google’s Privacy Policy and your Android ad settings (you can reset or limit your advertising ID in Android Settings).
• For some rewarded ads, Google notifies our server when you have finished watching so we can credit the reward to your account. This confirmation includes an account identifier and the reward details — not the ad’s content or your viewing history.
• Prompt text, course progress, and any other in-app data described in this policy are not shared with the ad network for ad targeting.

Third-party services

AILingo uses the following third-party services:

• Firebase Authentication (Google) — issues the anonymous or Google-linked identity token used to authorize requests to our server. See Google’s Privacy Policy.
• Google Cloud Run / Cloud Firestore (Google) — hosts our grading backend and its account, entitlement, and rate-limit data.
• Google Play Billing (Google) — processes all payments for in-app purchases and subscriptions.
• Google AdMob (Google) — serves the optional rewarded ads described above.
• An AI model provider — processes the prompt text you submit solely to generate a grading result. Your prompt text is not used by us or the provider to train models.

We do not share your information with data brokers, and we do not sell your data. Prompt text is never shared with any ad network.

Data retention

• Local course progress persists on your device until you clear app data or uninstall the app.
• If you sign in with Google, your synced progress and purchase records are retained on our server so they can be restored later. You can request their deletion at any time (see below).
• Prompt text submitted for grading is processed to produce a result and is not retained in routine logs. Limited technical metadata (excluding prompt text) may be retained for rate limiting, abuse prevention, and reliability.

Account and data deletion

If you have signed in with Google and want your server-side data deleted, you can request deletion of your account data — your synced progress, purchase/entitlement records, and badges. Full steps are on the Delete your account page. In short:

• Email utilityforgestudio@proton.me from the Google account you used in AILingo, with the subject line “Delete my AILingo account”.
• We will complete the deletion within 30 days and confirm by reply.

Note that records of the payments themselves (for example, for refunds and tax purposes) are held by Google Play under Google’s policies — we cannot delete those on Google’s behalf. Deleting your account data also removes purchased items from our records, so they can no longer be restored.

If you never signed in, we hold no account data about you: uninstalling the app removes your locally stored progress.

Your choices

• You can use the entire course without creating an account or signing in.
• Rewarded ads only play when you choose to start one.
• All purchases are optional; the full lesson course is free.
• Uninstalling the app removes all locally stored progress.
• Please avoid submitting passwords, API keys, or other sensitive personal information as prompt text, since submitted text is transmitted to our grading server.

Children’s privacy

AILingo is not directed at children under 13, and we do not knowingly collect personal information from children under 13.

Changes to this policy

We may update this privacy policy as the app changes. We will update the “Last updated” date above when changes are made. Material changes that affect what data is collected will be reflected here before they take effect.

Contact

If you have questions about this privacy policy or want to exercise any of the choices above, contact us at utilityforgestudio@proton.me.