Privacy policy and legal pages for the Anti Noise iOS and Android apps.
Effective date: May 19, 2026 Last updated: June 14, 2026
Anti Noise (“we”, “us”, “our”) operates the Anti Noise iOS and Android applications (the “App”). This Privacy Policy explains what information we collect, how we use it, and the choices you have. By using the App you agree to this policy.
When you sign in with Google or Apple (or with email + password for existing accounts), we collect:
The App captures content you choose to save:
This content is stored locally on your device and, where the feature is available, synced to our cloud database (Cloud Firestore) when you are signed in so you can access it across your devices.
To personalize your Daily Knowledge picks, the App stores the topic packs you choose and, optionally, your role, experience level, and learning goal. These are saved to your account profile and used only to select which learning topics you are shown. You can change or clear them at any time in Profile → Improve your feed.
The Android app is currently free and offers no in-app purchases. On iOS, when you purchase a subscription the App receives a receipt from Apple confirming entitlement. We do not receive your payment method, billing address, or full Apple ID. Apple charges you directly; we only see whether your subscription is active.
We collect anonymous app usage events (screens viewed, features used, capture counts, subscription events) and crash reports to improve the App. Diagnostic data is associated with a random installation identifier, not with your real identity.
The App does not ask for your phone number, location, contacts, calendars, or health data.
We use the information we collect to:
We do not use your content to train AI models. We do not sell your information to advertisers or data brokers.
The App uses AI to generate Feynman-style summaries, flashcards, and Daily Knowledge explainers. AI processing happens server-side: when you request AI output, the relevant content is sent to our own gateway (running on Cloudflare Workers), which authenticates the request with your account identifier and forwards the content to our AI provider (OpenRouter and the underlying model) using a key that we operate. You do not provide or manage any API key.
We do not retain the content of your captures on the gateway beyond the time needed to process the request, and we do not use your content to train AI models. Per our AI provider’s API policy, API inputs are not used to train models by default. Only the resulting summaries, flashcards, and Daily Knowledge items are stored in your account as described in Section 1. Our AI provider’s data handling is governed by its own privacy policy: https://openrouter.ai/privacy.
We rely on the following third-party services to operate the App. Each receives only the information necessary to perform its function:
| Service | Purpose | Data received |
|---|---|---|
| Apple — Sign in with Apple, App Store | Authentication, in-app purchases | Email (relay or real), purchase receipt |
| Google — Sign in with Google | Authentication | Email, name, Google account identifier |
| Google Firebase — Authentication | Account sign-in | Email, display name |
| Google Cloud Firestore | Cloud database | Your captures, summaries, flashcards, account profile |
| Google Firebase Analytics | Anonymous usage analytics | Installation ID, event names, screen names |
| Google Firebase Crashlytics | Crash reporting | Crash stack traces, device model, OS version |
| Anti Noise API (Cloudflare Workers) | Server-side AI gateway | Capture content you submit for AI processing, plus your account identifier |
| OpenRouter (and the underlying AI model provider) | AI summary, flashcard, and Daily Knowledge generation | Capture content relayed by our gateway (only when you trigger AI output) |
| RevenueCat | Subscription management | App User ID (random or your Firebase UID), purchase receipts |
Each provider stores data on their own infrastructure under their respective privacy policies. We do not control how these providers process data within their platforms.
Depending on your jurisdiction (GDPR, CCPA, Vietnam PDPL, etc.), you may have the right to:
To exercise these rights, contact us at the email below. We respond within 30 days.
Anti Noise is not directed at children under 13 (or the equivalent minimum age in your country). We do not knowingly collect data from children under that age. If you believe a child has provided data to us, contact us and we will delete it.
We use industry-standard measures to protect your information:
No system is perfectly secure. If you believe your account has been compromised, contact us immediately.
We are based in Vietnam. Your information may be processed in the United States or other countries where our service providers operate (including Google, Cloudflare, OpenRouter, and RevenueCat). By using the App, you consent to such transfers. Where required by law (e.g. GDPR), we rely on standard contractual clauses or equivalent safeguards offered by our providers.
We may update this policy from time to time. We will post the new version at this URL and update the “Last updated” date. Material changes will be announced inside the App. Continued use of the App after the change takes effect constitutes acceptance of the updated policy.
For privacy questions, data requests, or any other inquiries:
Email: support.gravita@gmail.com
We aim to respond within 5 business days.