ROT13 cipher. Apply the classic ROT13 letter rotation to text (encode and decode are the same operation).

Round with precision. Round, floor, or ceil a number to N decimal places or significant figures, without floating point surprises.

Run any model. Call ANY current model on OpenRouter (Claude, GPT, Gemini, Grok, DeepSeek, Llama, Kimi, Mistral - 300+). Priced per-token with margin, always up to date. GET /machines/run-model/models for the live list. Body: {model, prompt|messages, max_tokens?}.

Startup runway calculator. Months of runway from cash and burn rate, with optional revenue growth eating into net burn - when does the money run out.

SaaS metrics calculator. MRR, ARR, churn rate, net revenue retention and LTV from raw subscription numbers - the investor dashboard math.

Seeding rate calculator. Seeds and kilograms of seed needed from target plant population, germination rate and thousand-seed weight - planting planning.

Semantic version compare. Compare two semver versions (1.2.3-beta.1): returns which is greater and whether a constraint like >=1.2.0 is satisfied.

SHA-256 hash. Compute the SHA-256 hash of text - content fingerprinting, integrity checks, dedupe keys.

SHA-512 hash. Compute the SHA-512 hash of text for high-strength fingerprints and integrity verification.

Signature splitter. Split a 65-byte Ethereum signature into r, s, v; detects EIP-155 chain ID and normalizes v to 27/28.

Simple interest calculator. Compute simple (non-compounding) interest and final amount for a principal, rate and time.

Slippage calculator. Minimum received and slippage bounds for a trade: expected amount ± slippage tolerance in percent or bps.

Slugify text. Convert any text into a clean URL slug: lowercase, hyphen-separated, accents stripped, safe for URLs, filenames and IDs.

Solana address validator. Validate a Solana address: base58 decoding to exactly 32 bytes.

Solidity encodePacked + keccak. Compute keccak256(abi.encodePacked(...)) for address/uint/bytes/string values - commitment schemes, merkle leaves, signature digests.

Sort JSON array. Sort a JSON array of numbers, strings, or objects by a key - ascending or descending, numeric or alphabetical.

Sort lines. Sort the lines of a text alphabetically or numerically, ascending or descending, with natural-order option.

SSL certificate check. Inspect any public host's TLS certificate in one call: expiry date and days remaining, issuer, subject, SANs, chain validity and TLS protocol. Built for monitoring agents that babysit domains.

Descriptive statistics. Compute mean, median, mode, min, max, range, variance, standard deviation and percentiles for an array of numbers.

Livestock stocking rate. Animal units and stocking rate math: how many head a pasture carries from area, forage yield and utilization - grazing planning.

Solidity storage slot. Compute storage slots for Solidity mappings and arrays: keccak(pad(key) ++ pad(slot)) - direct eth_getStorageAt reads.

Summarize. Condense a block of text into a tight summary. Powered by openai/gpt-4o-mini. Max 500 output tokens.

Sunrise / sunset calculator. Compute sunrise, sunset, solar noon and day length for any latitude, longitude and date - pure astronomy, no API.

Text statistics. Count characters, words, sentences, paragraphs, unique words and estimate reading time for any text.

Timezone convert. Convert a datetime from UTC into any IANA timezone (Asia/Karachi, America/New_York, Europe/London...) with local formatting and UTC offset.

JSON to query string. Convert a flat JSON object into a URL query string with proper encoding.

Token amount formatter. Convert raw on-chain token amounts (uint) to human units and back, for any token decimals - USDC 6, ETH 18, WBTC 8.

Translate. Translate text to a target language. Powered by openai/gpt-4o-mini. Max 900 output tokens.

Triangle solver. Solve any triangle from SSS or SAS or ASA: all sides, all angles, area and perimeter - law of sines and cosines.

Truncate text. Truncate text to a maximum length at a word boundary, with customizable ellipsis suffix.

Uniswap V3 price ↔ tick ↔ sqrtPriceX96. Convert between Uniswap V3 sqrtPriceX96, tick and human token price, honoring token decimals - the V3 math everyone re-derives.

Unit converter. Convert between units of length, mass, volume, area, speed and digital data - km to miles, kg to lb, GB to GiB, liters to gallons and more.

Unix timestamp to ISO date. Convert a Unix epoch timestamp (seconds or milliseconds) to ISO 8601 UTC datetime.

URL decode. Decode percent-encoded URL text back to readable characters.

URL encode. Percent-encode text for safe use in URLs and query strings (RFC 3986).

User-agent parser. Parse an HTTP User-Agent string into browser, version, OS and device class; flags known bots and crawlers.

Generate UUID v4. Generate one or more random UUID v4 identifiers.

Deterministic UUID v5. Generate a deterministic name-based UUID v5 from a namespace UUID and a name - same inputs always give the same ID.

Credit card validator (Luhn). Validate a card number with the Luhn checksum and detect the brand: Visa, Mastercard, Amex, Discover.

Email validator. Check whether a string is a syntactically valid email address, with domain and normalized form.

IBAN validator. Validate an International Bank Account Number with the mod-97 checksum; returns country code and normalized form.

IP address validator. Validate IPv4 and IPv6 addresses; detects version, private/public ranges and loopback.

ISBN validator. Validate ISBN-10 and ISBN-13 book numbers with their checksums.

URL validator + parser. Validate a URL and break it into protocol, host, path, query parameters and fragment.

UUID validator. Check whether a string is a valid UUID and detect its version (v1, v4, v5...).

VAT / sales tax calculator. Add tax to a net amount or extract tax from a gross amount, at any VAT or sales-tax rate.

ISO week number. Get the ISO 8601 week number, day of year and quarter for any date.

BigInt token math. Exact add, subtract, multiply, divide and percentage on huge integer token amounts (wei, raw units) - no floating point errors ever.

Word frequency. Count how often each word appears in a text; returns the top N most frequent words - keyword analysis, SEO, content audit.

Word wrap. Wrap text to a maximum line width at word boundaries - terminal output, emails, fixed-width formats.