Bubble Level: Angle Protractor
Plumb Bob, Wall Slope Finder
Only for iPhone
Free · In-App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Hold your phone to any wall, shelf or post and see the exact lean in degrees, percent grade or roof pitch. Bubble level, plumb bob and angle finder in one.
A bubble level, plumb bob and angle finder in one app — hold your phone against a wall, post or shelf and read the exact lean in degrees, percent grade or roof pitch in rise-in-12.
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 to the side a wall leans and snaps 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 "close enough"
- Level a shelf, picture frame or handrail on the first try instead of nudging and re-checking
- See if a countertop, tile or table is flat on both axes, and exactly which edge to shim
- Read any slope three ways — degrees, percent grade, or rise-in-12 roof pitch like 6:12 — with no math
- Freeze a reading with Hold, so you can bring the phone down and still see the number
- Keep a timestamped log of every check, so you can prove what was true when you left the job
- Check the built-in reference for plumb vs level, quick workflows and common building slopes
PERFECT FOR
- DIYers hanging frames, shelves, mirrors and curtain rods
- Framers, tilers and finish carpenters checking jambs, studs and countertops
- Homeowners setting fence posts, gates and deck framing
- 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 truck.
PRIVACY
Everything runs on the motion sensor already in your device. 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: after the short setup, the entire app stays locked until you buy or restore a purchase. There is no free version and no free trial. Choose a weekly plan, a yearly plan, or a one-time lifetime purchase — all three unlock exactly the same toolkit: plumb bob, spirit level, two-axis surface check, the angle finder with degrees, percent and roof-pitch units, fine calibration, and the saved measurement log. 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 hasn’t 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
- Seller
- 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 Gauge, One Payment $49.99
- Slope Finder Yearly $24.99
- Bubble Gauge Weekly $4.99
- Copyright
- © 2026 Phuc Pham