Crypto tools should not ask for your wallet, phone home, or hide behind a paywall. This site exists to prove the point.
01 / Local-first
Your machine, your data. Every computation that can run client-side does: conversions, checksums, validation, hashing. No servers in the loop, no logs of what you typed.
02 / Wallet-free
No connection prompts, ever. Reading public data and doing arithmetic does not require signing anything, and a site that asks for a wallet connection to show you a number is asking for trust it does not need.
03 / BigInt-safe
No floating point lies. Balances and fees are integers on every chain, so this site computes with native BigInt end to end. What you see matches what the chain would see, down to the last wei, sat, lamport, or SUN.
04 / Free
No tier, no paywall, no accounts, no catch. Free to use and free to share. The privacy page is two paragraphs long because there is nothing to disclose.
Where the line is
Some data is inherently live: gas prices, mempool fees, exchange rates. For those, this site's own endpoints proxy public sources server-side, cache aggressively, and pass along numbers, never identity. Anything beyond that, custody, swaps, signing, portfolio tracking, is deliberately out of scope. Plenty of products do those things; this is not one of them.