Accuracy starts before the first reading.
A guided two-position calibration adapts the instrument to your iPhone, so your first real measurement already feels dependable.
Calibrated for your iPhone
Perfectly level.
On the first try.
A precise, beautifully simple level for surfaces, edges and angles. Calibrate once, measure with confidence, and own it forever.
DOWNLOAD ON THEApp Store
One lifetime unlock.
No subscription. No ads.
BUBBLE LEVELPRECISION
+0.0°
LEVEL±0.1°
◎Guided calibrationBuilt for reliable first measurements✓
Built as an instrument
Everything you need.
Nothing in the way.
Made for the five-minute fix and the full afternoon project alike.
The right instrument for every surface.
Switch between Edge, Surface and Angle modes without digging through menus or losing your reference.
Small controls that make real jobs easier.
Set a target angle, hold a reading, or create a relative zero when the job—not the room—defines level.
Three instruments in one
Measure the way
the job demands.
Each mode is focused, readable and ready the moment you need it. No clutter. No guessing.
Confidence from step one
Calibration without the guesswork.
Place your iPhone, follow two clear positions, and Bubble Level handles the offset. The entire process takes moments and stays on your device.
- ✓ Guided two-position flow
- ✓ Calibration saved locally
- ✓ Recalibrate whenever you want
A tool, not a trap
A useful instrument.
One lifetime unlock.
Unlock every measurement mode with a one-time purchase. Some new users receive a free first session; others see the lifetime offer after the introduction. The app shows your available access before measurement, and existing free-use allowances are preserved.
01one-time purchase∞measurements after unlock0subscriptions or ads
Available for iPhone