Toolkit: Ruler, Level, Compass

Toolkit puts the tools you actually reach for into a single app. No account, no sign-in, no internet connection, no tracking. Open it, tap what you need, get on with the job. 22 TOOLS IN ONE APP MEASURE • Ruler — centimetres and inches on screen. Calibrate it against a bank card once and it measures true. • Bubble level — a 2D surface level for flat surfaces and a single-axis level for edges, walls and posts. Calibrate to a surface you know is true. • Protractor — measure an angle on screen with two arms, or by tilting the phone. • Camera measure — estimate distance and height by aiming the camera at the base and the top of an object. SENSORS • Compass — bearing in degrees and points, true or magnetic north, with a calibration prompt when the reading drifts. • Sound meter — noise level in decibels, with minimum, average, maximum and a live graph. • Metal finder — magnetic field strength for finding nails, screws and steel studs behind a surface. • Light meter — ambient light in lux, with everyday comparisons so the number means something. • Altimeter — altitude and air pressure from the barometer, or from GPS on phones without one. • Speedometer — GPS speed, top speed and trip distance. LIGHT AND CAMERA • Flashlight — torch with an adjustable strobe and a Morse SOS signal. • Screen light — turn the whole screen into a light in any colour, and test for dead pixels. • Magnifier — zoom in on small print, freeze the image, turn on the light, boost the brightness. • Mirror — the front camera with zoom and freeze. • QR and barcode scanner — scan history, one-tap open and copy, and Wi-Fi codes you can read the password from. CALCULATE • Unit converter — length, weight, volume, temperature, area, speed, data and time, with over sixty units. • Tip and percentage — split a bill between any number of people, and every everyday percentage calculation. • Date and age — days between two dates, add or subtract days, months and years, work out an age, count working days. • Text tools — word and character count, reading time, change the case, generate a QR code. EVERYDAY • Stopwatch and timers — lap times, and named timers that keep counting even if you leave the app. • Counter — tally counters that remember where you got to. • Random picker — dice, a coin, a number in a range, a name from a list, or a strong password. WORKS COMPLETELY OFFLINE There is no internet permission in this app. It cannot send your data anywhere, because it cannot connect at all. Nothing you measure, scan, count or time ever leaves your phone. HONEST ABOUT ACCURACY A phone is not a set of instruments. The compass, level, ruler, sound meter, altimeter and camera measure are useful approximations built on consumer sensors, and every one of them tells you plainly what to expect and what makes it worse. For anything that has to be right — a survey, a boundary, a safety check — use a real instrument. You will not find inflated claims here. PERMISSIONS ASKED ONLY WHEN NEEDED Nothing is requested when you first open the app. The camera is asked for when you open the magnifier, mirror, camera measure or scanner. The microphone is asked for when you open the sound meter. Location is asked for when you open the speedometer, or turn on true north. Each one is explained before the system asks, and every tool works without the ones it does not need. BUILT FOR EVERY PHONE Small download. No background services. Tools that need hardware your phone does not have are hidden rather than left to fail, and Settings tells you which ones and why. Large touch targets, high contrast, full support for system text size, and a level that shows you it is level in words as well as colour. Light and dark themes. Metric and imperial. No clutter.