Bitcoin Gains Checker

BTC Gains Checker A private overview of your BTC portfolio's value over time. Record your Bitcoin gains and losses to track how your portfolio develops and what it's worth – in real time, with no compromises on privacy. BTC Gains Checker stores your transaction data exclusively on your phone. There's no need to create an account or send data to a server. The app connects to the internet only to fetch the current BTC price. The optional backup feature sends your data to Google Drive encrypted with AES-256-GCM, using a key derived from your passcode. Only an unreadable encrypted file ever reaches Google – neither the developer nor Google can read your transactions. FEATURES Portfolio overview – BTC holdings, total fiat invested, portfolio value, average purchase price, current profit or loss, and the current BTC price. Interactive chart – see your portfolio's development over time. Landscape chart – rotate your phone sideways for a larger chart. Historical P&L (Profit & Loss) – how the fiat value of your BTC has changed over time, based on real historical BTC prices. Transaction import and export – move transactions in bulk instead of entering them by hand. Multi-currency support – USD, EUR or CZK, and the option to combine them across transactions. Passcode & biometrics – protect access to the app with a passcode and your fingerprint or face unlock. Data encryption – optionally encrypt the app's data using your passcode. Encrypted Google Drive backup – optionally enable cloud backup. Your data can sync across your devices (same Google account and same passcode). Data is encrypted on your device, and without your passcode it's unreadable to anyone else. Hide values – tap a button or turn your phone face down to blur what's on screen, for extra privacy. PRIVACY & HOW IT WORKS Most portfolio trackers require an account and store your financial data on their servers. BTC Gains Checker works entirely privately – your data is never seen by the developer or by Google. Your transaction data is stored locally. No sign-up, no account, no need to share data with a server. The app connects to the internet only to fetch current and historical BTC prices. The app contains no analytics or advertising SDKs. Only anonymous crash reports are collected. Your passcode both unlocks the app and encrypts your data. Without it, the data cannot be decrypted. Optional cloud backup and cross-device sync use end-to-end AES-256-GCM encryption with a key derived from your passcode. All devices must share the same passcode to sync. Nobody but you can read the data stored on the server.