androidAndroid 8.0 and up

Toolbox

Flip a coin, tune a guitar, time an egg, pop some bubble wrap, or beat a friend at Connect Four. Forty-six small everyday tools, fidget toys and games in one tidy, ad-free app.

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Free and offline. No ads, no accounts, no tracking. What’s new in 1.4.0

46tools, toys and games
0ads, trackers or accounts
0third-party libraries
100%works offline

A look inside

Material You throughout, with real physics for the coin and dice.

The home screen: search, category chips and a two-column tool grid
Home
Coin in Throw mode: tails, 7 heads and 7 tails, 2 tails in a row, and the last ten results in the history bar
Coin
Dice in Throw mode: three six-sided dice totalling 14, with the last ten totals in the history bar
Dice
The Calculator with 150 in memory, recalled into 1200÷12+150, previewing 250
Calculator
Connect Four, won against the computer
Connect Four
Bubble Wrap with a third of the sheet popped
Bubble Wrap

Everything in the box

Tiles are grouped into categories, and anything you use often can be starred into Favourites. Search matches keywords too, so “decibel” finds the sound meter and “north” finds the compass.

casinoDecision Making

Shake your phone to decide: it works on all six.

CoinQuick flip, or Throw: a physics coin you swipe or flick. Keeps counts and streaks.
Diced4 to d20, up to six at once. Quick roll, or throw them across a walled table. Keeps your last 20 rolls.
Magic 8-BallAsk a question and shake for one of the 20 classic answers.
Random NumberAny whole number in a range, negatives included, with your last 20 kept.
SpinnerA wheel of up to 20 of your own options. A flick always turns it at least twice, so it can’t be aimed. Keeps your last 20 results.
Team SplitterSplit up to 60 names by team count or team size, then share the teams as text. Your last split is kept.

straightenMeasurements

Uses your phone’s sensors and microphone. Permissions are only asked for when you open a screen that needs them, and approximate location only if you turn on true north.

Bubble LevelTilt on both axes to 0.1°, which edge is high, and “Set as level” for a phone that doesn’t sit flat.
CalculatorBrackets, phone-style percentages, a live preview and exact decimals. Memory keys, your last 50 sums, and it turns with the phone.
CompassMagnetic or true north, with calibration and interference warnings and a marked bearing to follow.
Sound MeterApproximate dB with min, average, max and 30 s of history. Calibrate it to your phone’s mic.
Step CounterCounts from midnight even with the app closed. Goal ring, distance, calories and a 7-day chart.
Tally CounterTap to count anything, with undo after a reset.
TunerChromatic, guitar, bass, ukulele and violin, with a needle in cents.
Unit ConverterEleven categories, with UK and US pints, gallons, tons and mpg. Cooking turns cups into grams and gas marks into °C.

scheduleTime

Clocks and counters for the kitchen, the gym and the practice room.

Date CalculatorDays and working days between dates, adding and subtracting, and age.
Metronome30 to 250 BPM and tap tempo, 2/4 to 6/8 with accents, and 2, 3 or 4 clicks a beat. Remembers your settings.
StopwatchHundredths of a second and laps. Keeps running with the app closed, with Pause and Lap in the notifications.
TimerA real alarm: it rings on time with the phone asleep, at alarm volume, until you stop it. Countdown in the notifications.

toysFidget Toys

Satisfying sounds and vibration, with one vibration switch for the whole app.

Bubble WrapPop, pop, pop. Some bubbles are stubborn.
Clicky SwitchesA toggle, rocker, arcade button, clicky pen and notched slider.
Fidget SpinnerFlick it up to 1,200 RPM, or rest a finger on it to brake.
Infinity CubeEight hinged cubes that fold open, roll over and close again, forever. It follows your finger and snaps shut with a click.
Purring CatStroke from head to tail to make it purr. Not the other way.
Rain StickTilt the phone to pour 200 grains past the pegs.
Rotary DialFine clicks, chunky detents, or a free spin.
Zip & RatchetZip it up, crank it down.

Calm

Slow down for a minute, or drift off to the sound of rain.

MeditateGuided breathing in three patterns, for 1 to 10 minutes, with a gentle vibration while you breathe in.
SoundscapesRain, waves, wind, fire and three kinds of noise, mixed your way. Keeps playing with the screen off, with a sleep timer.

sports_esportsSolo Games

Quick games with saved best scores. They pause when you leave.

2048Slide and merge the tiles, and keep going past 2048.
Block BreakerClassic, or Action with steel and explosive bricks and power-ups.
Block DropFalling blocks, with the next piece, a ghost where it lands and hard drops. Faster every 10 lines.
Lights OutEvery puzzle has a par to beat, and hints if you’re stuck.
Memory GameFind the eight pairs in as few moves as you can.
Reaction TimeFive rounds: tap the moment it turns green.
SimonRepeat the growing pattern, with the original tones.
SnakeThe classic, with wrap-around edges. Fill the board to win.
SolitaireKlondike patience, Draw 1 or Draw 3. Tap a card to send it where it fits, and undo all the way back.
Stack TowerOverhangs are sliced off; perfect drops regrow the block.

groupDuo Games

Charades is for a room full of people. The rest can be played against the computer or with a friend on the same phone, with a saved tally for each.

Air HockeyFirst to seven, against the computer or a friend at the other end.
BattleshipsPlace your fleet, then take on the computer, or pass the phone between turns.
CharadesPhone on your forehead: tip it down when you guess the word, or up to pass. Eight decks, or make your own.
Connect FourFour in a row, with undo.
Dots and Boxes3×3 to 5×5 boards.
DraughtsEnglish draughts with compulsory captures, against the computer or a friend across the table.
SnowmanHangman with a melting snowman instead of a gallows.
Tic-Tac-ToeNoughts and crosses. Who goes first takes turns.

Small, private, made with care

Toolbox is built in Kotlin and Jetpack Compose, styled after Google’s own search tools.

palette

Material You

Picks up your wallpaper colours on Android 12 and later, with light and dark themes.

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Nothing leaves your phone

No internet permission, no analytics, no ads and no sign-in. Scores and settings stay on the phone, and go only into your own Android backup if you use one. Step history and the stopwatch are left out. True north keeps only the declination, never your location.

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No third-party code

Pitch detection, audio synthesis, dice and coin physics and every game AI are written from scratch.

vibration

Shake to decide

Shake your phone to flip, roll, spin, ask, pick a number or reshuffle teams. Harder shakes throw higher.

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Works with TalkBack

Every screen reads out properly and fits at large text sizes, and the turn-based games can be played with TalkBack.

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Permissions on demand

Microphone and activity access are only asked for when you open a screen that needs them, approximate location only for true north, and notifications when you first start a timer or the stopwatch.

Install on your phone

  1. Download Toolbox.apk from the latest release on your Android phone.
  2. Open it. If asked, allow your browser or file manager to install unknown apps.
  3. Tap Install, then find Toolbox in your app drawer.

Needs Android 8.0 (Oreo) or later.

Upgrading from 1.0.0? It was signed with a different key, so uninstall it first. Its scores and favourites can’t be carried over. Later versions update in place.

Build it yourself

Open the project in Android Studio and press Run, or use Gradle with JDK 17 or newer:

git clone https://github.com/totallynotkasai/Toolbox.git
cd Toolbox
./gradlew installDebug