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Track what you hold and whether you are up or down versus your cost basis — privately in the browser, without uploading balances to CryptonicTools.
Launch Portfolio Tracker →Purpose
Track what you hold and whether you are up or down versus your cost basis — privately in the browser, without uploading balances to CryptonicTools.
When to use it
- You want a quick multi-asset P&L without connecting a wallet
- You keep a personal cost basis per coin and need live marks
- You prefer localStorage over exchange portfolio UIs
- You are teaching someone portfolio basics without KYC apps
How to use it
- Add a holding. Enter the coin, amount, and your average entry price.
- Save locally. Holdings persist in localStorage on this browser profile only.
- Review live value and P&L. Live USD marks come from CoinGecko; P&L is value minus cost basis.
- Update when you trade. Edit amounts and entries after buys or sells so the book stays honest.
Benefits
- No account and no custodial sync
- Cost-basis P&L that matches how many investors think
- Fast mobile checks on a phone browser
- Works alongside converter and DCA tools on the same site
Pitfalls to avoid
- Clearing site data deletes the portfolio
- No cross-device sync by design
- Does not include DeFi wallet positions unless you enter them manually
- Spot USD marks ignore local tax lots and wash-sale rules
Where your data lives
Everything stays in your browser’s localStorage. That is a feature for privacy and a responsibility for backups: export screenshots or notes if the book matters. CryptonicTools servers never receive your holdings list.
Shared computers are a poor fit unless you clear data after. Treat the tracker like a local notepad with live prices, not a bank.
How P&L is calculated
Cost basis is amount × your entry price per line. Live value uses CoinGecko USD. P&L equals value minus cost basis. That is unrealized P&L for spots you still hold; it is not a tax lot engine.
For rough tax sketches, pair with the capital gains helper and keep proper records elsewhere. This is not tax or financial advice.
Benefits of a no-login book
Many portfolio apps want wallet connect or exchange API keys. This tracker skips that surface area. You gain speed and privacy; you lose automatic on-chain discovery. Enter LP tokens or staked amounts manually if you want them in the total.
Related links
Updated 2026-09-09. Educational only — not financial advice.