Plumbly vs Protractor, Level

Plumbly turns your iPhone into a precise, always-available toolkit — no batteries, no bag, no searching. SPIRIT LEVEL Place your iPhone on any surface: table, shelf, picture frame, or floor. The round 2D bubble shows instantly whether it's level. The linear level handles walls and vertical surfaces. The moment you hit ±0°, a short vibration and sound confirm the measurement — no squinting required. RULER Millimeters and inches, side by side, across the full screen length. Exact PPI values are stored for every current iPhone model, so you measure accurately from the very first use. The Pro upgrade adds a manual calibration offset so you can fine-tune the ruler to your device. ANGLE METER Hold your iPhone against any surface, trim, or slope. The angle is displayed live from 0° to 360°. The freeze button locks the current reading — great for awkward positions where you need to move before you can see the screen. INCLINOMETER (Pro) Slope in degrees and percent — with individual calibration so you can define any surface as your zero reference. Useful on construction sites, for setting up shelving units, or checking roof pitches. The built-in compass shows magnetic heading in real time. PRO FEATURES • Inclinometer with ° and % plus compass • Manual ruler calibration offset Unlock all Pro features with a single purchase — no subscription, no recurring fees. NO ACCOUNT. NO SUBSCRIPTION. Plumbly works without registration, without a cloud connection, and without hidden costs. Buy once, use forever.

Ruler, tape measure, bubble level and protractor. Four measuring tools in one app. Every tool is free. Centimetres and inches are both free. There is no subscription. RULER Measure anything against the edge of your screen. Centimetres and inches are shown at the same time, so there is no toggle to hunt for. Drag to measure, freeze the reading, copy it with one tap. TAPE MEASURE For anything longer than your phone. Measure one screen at a time and Notch adds up the running total as you go, with undo if you slip. BUBBLE LEVEL Lay the phone flat for a two-axis bubble, or hold it against a wall for a single-axis level. Reads in degrees and slope percentage, and buzzes the moment it is level so you do not have to watch the screen. Set your own zero on any surface. PROTRACTOR AND ANGLE FINDER Measure the tilt of a surface and hold the reading while you move the phone. Or drag two arms on screen to measure an angle on paper. ACCURATE, AND YOU CAN CHECK IT Notch knows the exact pixel density of your device, so it is accurate the moment you open it. If you want to verify, calibrate against any bank card. They are the same size in every country. WORKS ANYWHERE No account. No internet connection needed. No tracking, and nothing is sent anywhere. Notch Pro is a one-time purchase that saves your measurements to a history list. The measuring tools stay free forever.