PlumbLine: Level & PlumbPlumbLine: Level & Plumb
Is that wall truly straight? Hold your phone to it and know in a second.
Download on the App Store
Screenshots
Features
Hold it, don't read it
Press the back of your phone against a wall, post, door frame or shelf. The whole screen turns green the instant the surface is truly vertical or level — with a beep and a tap, so your eyes stay on the wall.
Plumb and level, automatically
Stand the phone up against a wall and PlumbLine checks plumb. Lay it flat on a shelf and it checks level. It senses how you're holding it and switches on its own — you never pick a mode.
A plumb bob, reimagined
Instead of a bubble to squint at, a weighted plumb line hangs from the top of the screen. When the surface is true, the line meets the reference; tilt it and the bob swings aside. You read it at a glance.
Made for real work
Set a tolerance — strict, standard or rough — and the color verdict follows it. Zero against an existing surface to match a new one to it. Hold the reading to check a spot you can't watch. Save surfaces to compare later.
Private and offline
One-time purchase. No subscription, no ads, no account. PlumbLine works fully offline and nothing you measure ever leaves your device.
Is that wall truly vertical? Is that shelf actually level? Hold your iPhone against the surface and PlumbLine tells you instantly — no bubble to squint at, no numbers to read. The whole screen turns green the moment it's straight.
HOLD IT, DON'T READ IT
- Press the back of your phone flat against a wall, post, door frame, shelf or picture frame
- A big target view shows the tilt front-to-back and left-to-right at a glance
- The screen flashes green with a beep and a tap the instant the surface is true — so you can adjust with your eyes on the wall, not the phone
VERTICAL AND HORIZONTAL, AUTOMATICALLY
- Put the phone upright against a wall and PlumbLine checks plumb (vertical)
- Lay it flat on a shelf and it checks level (horizontal)
- It senses how you're holding it and switches — you never pick a mode
MADE FOR STRAIGHTENING THINGS
- Hanging pictures and shelves, setting fence posts, aligning door frames, leveling furniture and appliances
- Set your tolerance: strict, standard or rough — the color verdict follows it
- Zero it against an existing surface to match a new one to it
SMALL TOUCHES THAT HELP
- Hold the reading to freeze it, then step back and check a spot you can't watch
- Save measured surfaces with a name to compare them later
- Choose degrees, percent slope or mm/m
PRIVATE AND SIMPLE
- One-time purchase. No subscription, no ads, no account
- Works fully offline. Nothing you measure ever leaves your device
PlumbLine is a planning aid. For precision construction, use a calibrated tool.