Randomness

Generate repeatable synthetic test records from a field recipe and seed, with format-aware output and checks for blanks or normalized fields.

Score a finished 7 Wonders game, convert remaining coins into treasury points, and rank each city with the official treasure tie-break.

Generate cryptographically random API keys in your browser with public lookup IDs, SHA-256 verifier hashes, and issuance warnings.

Create reproducible bingo card packs from your own prompts, with seeded shuffling, duplicate cleanup, coverage checks, and caller order.

Create a reproducible permuted-block allocation schedule using arm ratios and optional strata, with balance checks and final-block controls.

Flip a fair or biased coin with fresh or seeded randomness, then compare observed counts with expected outcomes and reproducible streak history.

Generate a seeded HEX palette with fixed harmony rules, black-or-white text choices, and WCAG contrast checks for every color pair.

Generate reproducible Luhn-valid card-shaped fixtures for form testing, with synthetic prefixes and optional CVV or expiry fields.

Roll tabletop dice notation with keep/drop rules, advantage, rerolls, explosions, seeded replay, and empirical target success rates.

Generate a Diceware passphrase from the EFF long list with secure browser or manual dice rolls, entropy estimates and policy checks.

Work out which team advances from a two-leg tie, with configurable away-goals, extra-time and penalty-shoot-out rules plus a scoreline map.

Generate repeatable lorem ipsum for layout testing with paragraph, sentence, or word targets and adjustable vocabulary and formatting.

Generate repeatable MAC address batches for labs and fixtures with prefix control and address-class flags, plus notation and duplicate checks.

Tune seeded Matrix-style code rain, balance motion and contrast, then compare measured frame delivery with the selected FPS target.

Challenge a friend on the same device or play Rock Paper Scissors against the computer, with best-of scoring and repeatable computer throws.

Generate random integers or decimals from a stepped range with secure or seeded draws, weighted profiles, exclusions, and repeat controls.

Pick random names or rows with reproducible seeds and optional weights, then review group limits and estimated inclusion chances before sharing the draw.

Build a reproducible classroom seating chart from names or CSV data with fixed seats and blocked desks, plus capacity checks and a printable plan.

Generate a unique password in your browser with adjustable character rules, unbiased random selection, and clear strength estimates.

Create a seeded starfield screensaver, tune perspective and motion, and check scene intensity against measured browser performance.

Decode a UUID into canonical text and inspect its version, variant, bit fields and embedded time with checks for sentinel or legacy layouts.

Generate random, name-based or time-ordered UUIDs and inspect canonical form with version semantics, bit allocation and privacy tradeoffs.