How to use Portfolio Tracker
Add symbol, amount, and cost basis per lot. Holdings stay in localStorage. Totals show portfolio value, aggregate cost, P&L, and ROI using live CoinGecko USD marks that refresh about every minute (paused when the tab is hidden).
Formula & methodology
Position value = amount×spot. Cost = amount×costBasis. Portfolio PnL = Σ(value−cost). ROI = PnL/Σcost. Spots load through /api/prices with a 60s shared cache.
Track crypto portfolio P&L in your browser
Many portfolio apps demand email signup and cloud sync. CryptonicTools stores holdings only in your browser, which suits a personal watchlist or a shared laptop where you clear data when you are done.
Mark-to-market uses the same CoinGecko USD feeds as converter and price pages, so P&L stays consistent across the site. Add multiple lots of the same asset for separate cost bases. Remove rows when you sell.
There is no backup server, so export or screenshot balances if they matter. Local-only storage avoids auth complexity and custodial risk.
Cost basis vs mark-to-market
Cost basis is what you paid. Mark-to-market is what the stack is worth now. ROI mixes both into one percentage so you can glance at performance without a spreadsheet. Separate lots keep different entries distinct.
If live prices fail, holdings still display but P&L may understate until Retry succeeds. That keeps your list intact instead of wiping the session.
Related searches: portfolio tracker, crypto portfolio, pnl. All CryptonicTools utilities are free, mobile-first, and require no account.