Randomness

Generate repeatable synthetic test data from field recipes and seeds, with CSV, JSON, NDJSON, SQL output and recipe quality checks.

Score a finished 7 Wonders game, convert remaining coins, resolve treasury tie-breaks, and audit each city's category totals and rank.

Generate API keys in your browser with public lookup IDs, entropy targets, SHA-256 storage hashes, and sensitive-batch warnings.

Create printable bingo cards from your own prompt list, check unique-item coverage, and export seeded boards, caller decks, and records.

Generate a reproducible block randomization schedule with arm ratios, strata, seeded blocks, balance checks, and review-ready exports.

Flip a fair, biased, or seeded coin locally, then compare streaks, expected counts, probability gaps, charts, and the session ledger.

Build a HEX color palette from one seed, compare WCAG contrast pairs, and copy usable swatches, CSS tokens, charts, or JSON reports.

Generate Luhn-valid sandbox card numbers with optional CVV, expiry, BIN/IIN prefixes, masking, seeded replay, and prefix mix reports.

Roll tabletop dice notation for play or odds checks with advantage, rerolls, explosions, target rates, traces, charts, and a local log.

Generate a Diceware passphrase from EFF long-list rolls, then check entropy, manual dice evidence, length limits, and site policy fit.

Work out a two-leg knockout tie from both scores, host order, away-goals rules, extra time, penalties, and live scoreline maps.

Generate repeatable lorem ipsum for mockups, tune paragraph or word targets, and review metrics before copying formatted output.

Generate MAC address batches for VM labs, fixtures, and docs with prefix control, local/unicast flags, seeded replay, and duplicate checks.

Design a Matrix-style code rain screensaver, tune glyph density, glow, trails, and FPS, then compare metrics and operator cues.

Generate random integers or decimals from a range, compare secure and seeded draws, and inspect repeats, coverage, bias, and exports.

Pick random names or rows from a list with seeded replay, weights, group caps, inclusion-odds estimates, and a clear draw manifest.

Create classroom seating charts from roster text or CSV, honoring fixed seats, empty desks, seeded shuffles, group balance, and audit notes.

Generate account-ready passwords in your browser, tune character rules, and compare entropy, crack-time, zxcvbn strength, and history.

Design a browser starfield screensaver, tune star density, warp, comets, and FPS, then compare quality scale and flight notes.

Decode one UUID into canonical forms, verify version and variant bits, expose timestamps or node fields, and export bit-lane evidence and JSON.

Generate UUIDs for random, name-based, or time-sortable IDs, then inspect canonical form, version markers, namespace inputs, and history.