Bubble Level: Angle Protractor
Plumb Bob, Wall Slope Finder
Only for iPhone
Free · In-App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Press your phone to a wall, shelf or post and read the exact lean in degrees, percent or pitch. Bubble level, plumb bob and angle finder, with a pass or fail check.
A bubble level, plumb bob and angle finder in one app — hold your phone against a wall, post or shelf and read the exact tilt in degrees, percent fall or roof pitch.
Most level apps stop at a bubble sliding in a tube. PlumbLine adds the tool the trades actually reach for: a digital plumb bob that swings towards the side a wall leans and turns green at true vertical, a two-axis surface check that tells you which edge sits low, and a calibration step that cancels out a slightly bent case so every later reading is honest.
WHAT YOU GET
- Know instantly whether a wall, post or door jamb is truly vertical, not just "near enough"
- Level a shelf, picture frame or curtain pole first time instead of nudging and re-checking
- See whether a worktop, tile or table is flat on both axes, and exactly which edge to pack out
- Read any slope three ways — degrees, percent fall, or rise-in-12 pitch — with no maths
- Match a reading to the nearest of nine common building slopes, from a plumb wall to a steep roof
- Freeze a reading with Hold, so you can lower the phone and still see the number
- Keep a timestamped log of every check, so you can show what was true when you left the job
PERFECT FOR
- DIYers hanging frames, shelves, mirrors and curtain poles
- Joiners, tilers and finish trades checking jambs, studs and worktops
- Homeowners setting fence posts, gates and decking
- Anyone who wants a straight result without carrying a spirit level around
WHY NOT JUST USE A POCKET SPIRIT LEVEL?
A physical level tells you the bubble is "about" centred. PlumbLine gives you the number — 0.4 degrees of lean, low on the right — plus a pass or fail badge against a tolerance you set yourself, and a saved record afterwards. It is already in your pocket, and it never gets left in the van.
WHAT IS INSIDE
Five tabs: Plumb, Level, Surface, Angle and Saved. A Learn sheet explains plumb versus level, walks through real jobs (hanging a frame, setting a fence post, checking a wall, calibrating) and lists common slopes and roof angles. Settings holds your unit choice, haptic feedback, calibration and reset, an optional daily 7pm reminder and Restore Purchases.
PRIVACY
Everything runs on the motion sensor already in your device. No camera, no account, no ads, no tracking, no internet connection needed. Your readings and saved log stay on your phone.
FULL ACCESS
PlumbLine is a paid app with no free tier. After a short setup the whole app is locked until you buy: plumb bob, spirit level, surface check, the angle finder with percent and pitch units, fine calibration and the saved measurement log all sit behind one purchase. Choose a weekly plan, a yearly plan, or a one-off lifetime purchase. Only a purchase or Restore Purchases opens the app, and Restore Purchases is always available in Settings.
Open PlumbLine, press a long edge of your phone flat against the next wall you were about to eyeball, and see how far off it really is.
Not for surveying, aviation or safety-critical alignment. Readings are approximate.
Terms of Use (EULA): https://web-levi.web.app/terms
Privacy Policy: https://web-levi.web.app/privacy-policy
Questions? Contact tphuc.work@gmail.com
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Bug fixes and performance improvements.
Subscriptions
In-App Purchases
The developer, Phuc Pham, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Phuc Pham
- Size
- 5.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Angle Finder, Pay Once ₱ 1,290.00
- Slope Finder Yearly ₱ 599.00
- Bubble Gauge Weekly ₱ 129.00
- Copyright
- © 2026 Phuc Pham