CryptoTools — https://cryptotools.tech — A growing suite of 30+ free, single-purpose crypto & finance tools. Three families: calculators (Bitcoin DCA backtest, profit/P&L + tax, mining, portfolio/tax CSV, staking, leverage, liquidation, position size, impermanent loss…), converters (gwei↔ETH + gas fee, satoshi↔USD, hashrate), and a privacy-first cryptography toolkit that runs 100% in your browser — nothing is ever uploaded (SHA-256/keccak hashing, AES, RSA & key generators, BIP39 seed phrases, HD wallet addresses, JWT decoder, plus EVM/ENS/EIP-712 dev tools and more). Plus interactive Bitcoin data studies (DCA backtests, "what if you missed the best days", a monthly-returns heatmap). No sign-up, no tracking, no paywalls; pure static site with sub-second loads; works in 10 languages; every tool is embeddable. For traders, builders, and the privacy-conscious who want a fast answer without a bloated SaaS dashboard.
Features
- 30+ free crypto & finance tools in one place — calculators, converters, and a full cryptography toolkit, plus 8 interactive Bitcoin data studies.
- Privacy-first — every cryptography tool (hashing, AES, RSA, BIP39 seed phrases, HD wallets, message signing, JWT decode) runs 100% in your browser; nothing is ever uploaded.
- No sign-up, no tracking, no paywalls — open a page, get your answer.
- Blazing fast — static site, sub-second loads, green Core Web Vitals; no bloated SaaS dashboard.
- Works in 10 languages — localized tools and SEO out of the box.
- Every tool is embeddable — drop a calculator or data study into your own site/blog with a copy-paste widget.
- Live data, handled gracefully — real-time prices/gas for DCA, mining and converters, with safe offline fallbacks.
- Developer-grade web3 tooling — EVM bytecode disassembler, function-selector & ENS namehash, EIP-712 hasher, raw-transaction decoder, Merkle tree, Shamir secret sharing, ECC visualizer.
- Honest math — formulas and assumptions shown on every tool; estimates, never upsells.
Use Cases
- Traders & investors — backtest dollar-cost averaging, estimate profit/loss + tax, size a position, check liquidation price, measure impermanent loss.
- Crypto tax prep — turn a CSV of trades into realized gains & cost basis (FIFO), entirely on your machine — nothing leaves the browser.
- Miners — estimate profitability, power cost and hardware break-even across BTC, LTC, DOGE and more.
- Web3 & smart-contract devs — decode a raw transaction, disassemble EVM bytecode, compute function selectors / ENS namehashes / EIP-712 digests, spin up throwaway keypairs.
- Security & privacy-conscious users — hash data, AES-encrypt notes, and generate seed phrases / wallet addresses / strong passwords fully in-browser.
- Quick conversions — gwei↔wei↔ETH (+ gas fee in fiat), satoshi↔USD, hashrate units.
- Educators & bloggers — embed a tool, or use the visualizers (proof-of-work, Merkle trees, elliptic curves) to teach.
- Sharing & research — interactive Bitcoin data studies ("what if you missed the best days", monthly-returns heatmap) made for posts and threads.
Comments
Hey Fazier 👋 I built CryptoTools because I was tired of crypto calculators that make you sign up, bury the tool under pop-ups, or quietly send your data to a server. It's a growing set of 30+ free, single-purpose crypto & finance tools — calculators (profit/P&L, DCA backtest, mining, tax + portfolio CSV), converters (gwei↔ETH, sats↔USD, hashrate), and a full cryptography toolkit (hashing, AES, RSA, BIP39 seed phrases, HD wallets, JWT decode, plus EVM/ENS/EIP-712 dev tools). The part I care about most: every cryptography tool runs 100% in your browser — nothing is ever uploaded. No sign-up, no tracking, no paywalls. It's fast (static pages, sub-second loads) and works in 10 languages, and every tool is embeddable. There are also a few interactive Bitcoin "data studies" (like "what if you'd missed the 10 best days?") that are weirdly fun to play with. It's a solo project — I'd genuinely love feedback on which tools are most useful and what's missing. Thanks for checking it out! 🙏
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Comments
Hey Fazier 👋 I built CryptoTools because I was tired of crypto calculators that make you sign up, bury the tool under pop-ups, or quietly send your data to a server. It's a growing set of 30+ free, single-purpose crypto & finance tools — calculators (profit/P&L, DCA backtest, mining, tax + portfolio CSV), converters (gwei↔ETH, sats↔USD, hashrate), and a full cryptography toolkit (hashing, AES, RSA, BIP39 seed phrases, HD wallets, JWT decode, plus EVM/ENS/EIP-712 dev tools). The part I care about most: every cryptography tool runs 100% in your browser — nothing is ever uploaded. No sign-up, no tracking, no paywalls. It's fast (static pages, sub-second loads) and works in 10 languages, and every tool is embeddable. There are also a few interactive Bitcoin "data studies" (like "what if you'd missed the 10 best days?") that are weirdly fun to play with. It's a solo project — I'd genuinely love feedback on which tools are most useful and what's missing. Thanks for checking it out! 🙏
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