Last updated: 15 April 2026
Buffett Stock Evaluator ("the app") is a free tool that scores publicly listed stocks against the investment criteria of Warren Buffett, Ray Dalio, and Benjamin Graham. This policy describes what data the app handles and what it does not.
No accounts, no personal data
The app has no sign-up, no login, and no user accounts. We do not collect, store, or transmit your name, email address, phone number, location, contacts, photos, device identifiers, or any other personally identifiable information.
What the app sends over the network
When you enter a ticker symbol and tap Analyse, the app sends that ticker symbol to a Cloudflare Worker endpoint operated by the developer. The Worker forwards the request to Yahoo Finance's public quoteSummary API and returns the company's financial metrics to the app. The only request data sent is:
- The ticker symbol you entered (e.g.
AAPL,BHP.AX) - Your IP address, as seen by Cloudflare — used solely for rate limiting to prevent abuse
The Worker does not log ticker lookups against your IP address beyond the short-lived in-memory rate-limit window (one minute). No lookup history is persisted server-side.
Third-party services
- Yahoo Finance — provides the underlying stock data. Your ticker lookups are fulfilled by Yahoo's public API via our proxy. Yahoo's own privacy policy applies to their handling of the proxied requests: https://legal.yahoo.com/us/en/yahoo/privacy/index.html.
- Cloudflare — hosts the proxy Worker. Cloudflare's privacy policy applies to any network-level data they observe: https://www.cloudflare.com/privacypolicy/.
What the app stores on your device
The app uses your device's local browser storage (localStorage) to remember the last few ticker symbols you searched, so they can appear as quick-tap chips on your next visit. This list never leaves your device and is not synced, shared, or transmitted to anyone. You can clear it at any time by uninstalling the app or clearing the app's data from Android Settings.
Analytics, advertising, and tracking
None. The app contains no analytics SDKs, no advertising SDKs, no crash reporters, no fingerprinting, and no third-party tracking of any kind.
Children's privacy
The app is not directed at children under 13 and does not knowingly collect any information from them. Since the app collects no personal information at all, this is structurally the case.
Permissions
The app requests only the standard Internet permission required to fetch stock data. It does not request access to your camera, microphone, location, contacts, storage, calendar, or any other sensitive device capability.
Data retention and deletion
No personal data is retained on our servers because none is collected. Any IP-based rate-limit counters held by the Cloudflare Worker expire within 60 seconds. To remove locally stored ticker history, uninstall the app or clear app data from Android Settings → Apps → Buffett Stock Evaluator → Storage → Clear data.
Not financial advice
The app's scores are informational and educational only. They are not financial advice, investment recommendations, or solicitations to buy or sell any security. You should conduct your own research and consult a qualified financial adviser before making investment decisions.
Changes to this policy
If this policy changes, the updated version will be published at the same URL with a new "Last updated" date. Material changes will also be noted in the app's release notes on Google Play.
Contact
Questions about this policy can be raised as an issue on the project's public repository: https://github.com/kanurag4/stock-evaluator/issues.
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