UTILITY / 001local-only
Random draw
A cryptographically backed integer draw for dice, decisions, and arbitrary numerology. Unbiased via rejection sampling.
INSTRUMENT CABINET
Tiny tools for tiny problems.
Useful enough to justify existing. Silly enough to belong here. Everything runs in this tab — see each card's badge for exactly what it touches.
UTILITY / 002local-only
Encoding workbench
Base64, Base64url, hex, percent, and HTML-entity codecs with live round-trip validation.
UTILITY / 003local-only
Hash bench
SHA-1/256/384/512 digests over text or a dropped file, computed with SubtleCrypto.
UTILITY / 004local-only
Token inspector
Decodes a JWT's header and payload, pretty-prints claims, and resolves timestamps. Verifies nothing.
Decodes claims only. This does not verify the signature — a decoded token is not a validated one.
UTILITY / 005local-only
Subnet calculator
IPv4 and IPv6 network maths — broadcast, hosts, masks, containment — using BigInt throughout.
UTILITY / 006local-only
Base & unit converter
Arbitrary-precision binary/octal/decimal/hex conversion, plus IEC/SI byte units made explicit.
UTILITY / 007local-only
Epoch bench
Unix time to ISO 8601 to human, in UTC and Moscow time, with a live ticking clock.
Now:
UTILITY / 008local-only
Entropy forge
Passphrase and password generation with a live entropy readout in bits and a bundled diceware wordlist.
UTILITY / 009local-only
Text metrics
Words, characters, unique tokens, Shannon entropy per character, and a top-16 frequency chart.
UTILITY / 010local-only
Line diff
An LCS line diff between two blocks of text, rendered as an addition/removal trace.
Input truncated at 2000 lines per side.
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INSTRUMENT / 011local-only
Automaton bench
Elementary cellular automata — rules 30, 90, 110, 184 — with seed control and PNG export.
INSTRUMENT / 012local-only
Lissajous plotter
Two-oscillator phase figures with frequency-ratio, phase, and decay controls.
INSTRUMENT / 013local-only
Frequency lab
A gain-capped Web Audio oscillator with a live spectrum readout. Nothing plays until you press start.
Nothing plays until you press Start. Volume is capped and ramped to avoid clicks.
ODDITY / 014local-only
Cipher lock
A Caesar/Vigenère puzzle with a frequency-analysis assist, and a free-form encode/decode mode.
GAME / 015local storage
Signal trace
A keyboard-playable memory game themed on the hero instrument's ring activations.
Press start, then repeat the sequence with keys 1–4.
ODDITY / 016local storage
Visitor counter
A local counter stored only in this browser. The global version can wait until the site has a server-side endpoint worth having.
This counts visits in this browser only. It is a diary, not surveillance.