03Unit 01

Small tools built entirely from the system’s components. Each one adapts from a 200px square to a desktop, works with the keyboard, and keeps its state in this browser only.

• iPhone and iPad

  Open an app in Safari, tap Share, then Add to Home Screen. Installed, the Tuner can use the microphone and Level the tilt sensor even where another browser blocks them.

• Android and desktop

  Open an app in Chrome or Edge and choose Install from the address bar or menu.

• Each one separately

  Every app installs as its own app, with its own icon. An installed app keeps its own data, apart from the browser’s copy.

• 01MetronomeWeb Audio metronome in any meter, with tap tempo, accents and subdivisions.Common meters from 2/4 to 12/8, accent, beat or mute on every beat, tempo fader, sound, presets, session stats.Sound starts after the first tap.
• 02TunerPitch detection from the microphone, plus reference tones.21-segment cents meter, strings per instrument, A4 from 415 to 466 Hz, pitch trace.Asks for microphone access.
• 03Drum MachineSixteen steps, four synthesised voices.Swing, mixer knobs, presets, playhead.
• 04DroneA held root or chord to practise against.Chord modes, four voices, fade, breathing LFO, A4 calibration.
• 05Ear TrainerInterval and chord quiz.Levels, streak, accuracy bars.
• 06Chord FinderName chords from a piano or fretboard.Inversions and slash chords, reverse build.Sharps only.
• 07TimerA countdown set with a knob.Presets, Pomodoro, alarm with flash, log.
• 08StopwatchLaps and splits.Fastest lap in orange, stats.
• 09World ClockLocal time and six cities, correct across daylight saving.24-hour overlap strip, time scrubber, 12 or 24 hour.
• 10CounterNamed tallies.Step, goal, two-tap reset, history.
• 11ConverterNine categories of units.All-units table, endless nudge dial, recent conversions.Currency uses a typed-in rate.
• 12DiceDice, coin and pick-one.Holds, history, distribution.
• 13LevelBubble and edge spirit level.Zero, hold, beep when level, drag demo mode.Needs a phone’s tilt sensor.
• 14HabitsUp to eight habits on a day grid.One, four or twelve weeks, streaks, backup and restore.
• 15SynthA playable mono or poly synth.Oscillator, filter, envelope, delay, presets, scope, computer-key play.
• 16CalculatorA hardware calculator.Scientific keys, memory, history, full keyboard.
• 17IntervalsA HIIT timer.Tabata, EMOM and 30/30 presets, beeps, timeline.
• 18NoiseWhite, pink and brown noise.Waves LFO, sleep timer with fade, mixer.
• 19BreatheBox, 4-7-8, even or custom breathing.Growing square, tone cues, log.
• 20SplitA bill and tip per person, in whole cents.Split by item, receipt, copy.
• 21ScoreScorekeeper for two to eight players.Rounds table, undo, wins.
• 22ColourAn OKLCH, HSL and RGB mixer.Contrast checker, palette, harmonies.
• 23CountdownDays until the events that matter.Yearly repeats, live clock inside 48 hours, calendar strip.
• 24PasswordsRandom passwords, passphrases and PINs.Entropy meter, masked history that is never saved, crack time.