Trueline vs Bubble Level

Trueline turns your iPhone into a level that behaves like a real instrument — quiet, readable, and honest about what it measures. Free: • Auto-switching modes — on edge or plumb you get a vial with a signed degree readout; laid flat it becomes a 2-axis bullseye surface level • Read in degrees, slope %, or roof pitch (rise per 12) • One-tap calibration • HOLD freezes a reading you can't see from where you're standing • ZERO for relative angles — the angle between two surfaces • Haptic snap and a green edge glow the moment you're level • Fully offline, no account Pro — one payment of $6.99, no subscription: • AR laser level: project gravity-true level and plumb lines onto the wall and hang a whole row of frames in one pass • Named angle presets — 4/12 and 6/12 roof pitch, stair rake, 2% drainage • Precision tolerance down to ±0.1° • 5 instrument themes • No ads Pay once, yours forever. No subscription, no sign-in, and nothing leaves your phone.

Turn your phone into a precise bubble level and angle meter. Level a shelf, hang a picture straight or check a slope in seconds, with a clear reading you can trust. One clean tool with four ways to measure: a classic spirit level, a 2D surface level, a digital inclinometer and a camera level. LEVEL A classic single-axis vial for shelves, picture frames, cabinets and countertops. Turn the phone to landscape and rest its edge against a wall, door frame or post to check that it is plumb (vertical). 2D SURFACE LEVEL A round bubble that levels both axes at once. Ideal for tables, tripods, a washing machine, a pool table or levelling a camper or RV. ANGLE METER A numeric protractor and inclinometer for ramps, roof pitch, stairs, drainage slope and miter cuts. Works in portrait and landscape. CAMERA LEVEL A live viewfinder with a crosshair keeps horizons and verticals straight while you frame photos of buildings, interiors and landscapes. BUILT FOR ACCURACY • Calibrate on a known flat surface for the most accurate readings • HOLD freezes the value, so you can read it after lifting the phone • Relative zero: set any surface as zero and measure the difference from it • Beep and vibration the moment the surface is level • Screen stays awake while you measure • Units: degrees, percent grade and mm/m • Adjustable precision: 0, 1 or 2 decimals SAVE YOUR MEASUREMENTS Save levels, angles and camera shots to History, add a note, and see a pass or fail mark for each result against your own tolerance. MAKE IT YOURS Light and dark theme, several level styles (Classic, Vial, Ring, Horizon) and more than 70 languages. GREAT FOR • Hanging pictures, mirrors, TVs and shelves • Installing furniture, kitchen cabinets and appliances • Laying tiles, flooring and decking • Levelling a camper, RV or travel trailer • Setting up a pool table or a camera tripod • Construction, carpentry and home DIY projects Keep a bubble level and angle meter in your pocket for every job around the house. This app is supported by ads. An optional one-time purchase removes them.