ZenLevel
Precision bubble level & plumb
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Level, plumb and slope in one calm instrument. HOLD any reading, then read it in degrees, percent grade, mm/m or in/ft. No ads. No tracking. No account.
ZenLevel turns your iPhone into a precision inclinometer with the calm, deliberate feel of a real machinist's instrument. Built for builders, DIYers, photographers, woodworkers, and anyone who needs something perfectly level, perfectly plumb, or at exactly the right slope.
FOUR MEASUREMENT MODES
SURFACE — Lay your iPhone flat on a countertop, shelf, or picture frame. The two-axis bubble instrument shows the exact inclination, with digits that roll smoothly between values like a laboratory dial. When you find true level, the interface shifts to a calm, luminous green.
PLUMB — Press the back of your iPhone against a vertical surface to check whether it is truly vertical. A tall bubble tube rises and falls with the wall's deviation, and a "check position" warning tells you when the phone is too flat for an accurate reading.
CALIBRATE — Every sensor drifts. Place your phone on a surface you trust, wait for the stability meter, and tap ZERO OUT. Offsets persist across launches, and Reset calibration restores factory defaults at any time.
HISTORY — Save any measurement to a log grouped by day. Tap an entry to see its details, edit its note, or delete it.
HOLD THE READING
Measuring under a shelf or behind a cabinet? Tap HOLD to freeze the reading, then take your iPhone out and read it — or save it — at your leisure. Tap RELEASE to go live again.
SLOPE UNITS
Show every reading in degrees, percent grade, millimetres per metre, or inches per foot. Rise-over-run units make drains, ramps, patios, decks, and gutters easy: a quarter inch per foot is simply 0.25 in/ft. Saved measurements follow your chosen unit and keep the original angle alongside.
LANDSCAPE PRECISION MODE
Rotate your iPhone to landscape and SURFACE becomes a long horizontal bubble vial for checking frames, shelf edges, and countertops along their length. A tipping indicator helps you keep the phone upright to avoid projection errors.
DESIGN THAT FEELS LIKE A REAL TOOL
• Deep blacks, subtle glass panels, and a signature zen-green accent
• Rolling digit transitions on every live readout
• Haptic feedback on level, save, calibration, and tab changes
• Rotation-lock detection that guides you when iOS is locked to portrait
• Decorative animations pause when Reduce Motion is on
PRIVACY FIRST, BY DESIGN
• No accounts, no login, no cloud sync
• No tracking, no analytics, no advertising
• No network requests of any kind
• Measurements and calibration stay on your device
• No third-party SDKs
WHO IT'S FOR
• Carpenters and builders checking walls, cabinets, and frames
• Plumbers and landscapers setting drain and patio falls
• DIY homeowners hanging shelves, pictures, TVs, and mirrors
• Photographers aligning tripods and subjects
• Woodworkers checking joinery and surfaces
ZenLevel isn't a novelty. It's a precision instrument that lives in your pocket, ready to settle "is this level?" in seconds.
Ratings & Reviews
New in 1.1:
• HOLD — freeze any reading with one tap, then read or save it after you take your iPhone out of an awkward spot.
• Slope units — show readings in degrees, percent grade, millimetres per metre or inches per foot, ideal for drains, ramps, patios and decks. Choose in Settings › Units.
• Saved measurements follow your chosen unit and keep the original angle alongside.
• The landscape panel now shows your unit and whether the reading is live or held.
• Decorative animations pause when Reduce Motion is on.
The developer, YANMIN WANG, 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
- YANMIN WANG
- Size
- 3.9 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+
- Copyright
- © 2026 YANMIN WANG