Privacy Policy

Last Updated: May 21, 2025
Our Privacy Commitment

Opportunity Cost respects your privacy. Our browser extension operates entirely on your device and does not collect, transmit, or store any of your personal information or browsing history on our servers. This Privacy Policy explains how your data is handled when using our Extension.
What Stays On Your Device
Local Settings & Preferences

Currency preferences and display settings
Theme settings (light, dark, or system)
Bitcoin denomination preference (sats or BTC)
User interface customizations


Optional Local Statistics

Domain names of sites where conversions occurred (if enabled)
Count of price conversions (no price data is stored)
Bitcoin price historical data (for your reference only)


All this information is stored exclusively on your device using browser storage mechanisms and is never transmitted to our servers.
How The Extension Works

Bitcoin Price Data: The extension fetches current Bitcoin prices from our API. No personal data is sent during these requests.
Page Processing: All webpage scanning for prices happens entirely on your device and no content from websites you visit is ever sent to our servers.
Local Storage: The extension uses your browser's built-in storage APIs (Chrome Storage API, Firefox Storage API, or IndexedDB) to store settings and optional statistics.


Your Control Over Your Data

View Local Data: All stored information is visible in the extension's Options page
Disable Statistics: You can disable statistics gathering entirely in the extension settings
Clear Data: Use the "Clear All Data" button in the Options page to remove all locally stored information
Uninstall: Removing the extension will permanently delete all local data


Changes to This Policy

We may update this Privacy Policy occasionally to reflect product improvements or legal requirements. Any changes will be posted on our website and in the extension's Options page, with an updated "Last Updated" date.
Contact Us

If you have questions about our privacy practices or this policy, please contact us:

Email: contact@opportunitycost.app
Website: https://opportunitycost.app