DumbLevel
It's just a level.
A bubble level for iPhone that also works out where the marks go. $2.99, once. No subscription, ever. No ads, no timer, no account, and nothing leaves your phone.
Coming to the App Store.
What you are not getting
- No subscription
- No account
- No ads
- No timer
- No analytics
- No internet
Most phone levels now charge by the week and lock you out after twenty seconds. This one charges $2.99 one time and then leaves you alone.
What it does
- Picks the mode itself. On its edge for a level line, upright for plumb, flat for a two-axis bubble.
- Reads to a tenth of a degree in numbers you can read from a ladder. Green within two tenths, then amber, then red, and it says which end is high.
- Tilt in inches. Pick the length of your shelf and it tells you the drop over that length, to the nearest 1/32. That is the shim.
- Hold. Freeze the number, lift the phone, read it.
- Calibration that cancels the phone's own sensor bias. Capture, turn the phone end-for-end on the same spot, capture again. The true tilt cancels out; what's left is the phone's error, and it gets subtracted from then on. Same trick the precision digital levels use.
- Sounds you can work by. Sonar pings that speed up as you get close and a coin chime at level, so you can watch the shelf instead of the phone. Pings and chime, chime only, or muted.
- What are we doing? One picture, a row of frames, a grid of frames, shelves, hooks, or a curtain rod. A few plain questions with the usual rule already filled in (57 inches at eye level, 6 to 10 above the couch, 2 to 3 between frames, a rod 4 to 6 above and past the window, hooks at 60), then it does the math and hands you every mark in inches from the end of the wall or the window.
- Then hang it. A to-scale drawing of what you are about to put up, a walkthrough that shows one mark at a time in giant numbers, share the list as text, and a Level it button so the level checks each one.
The level built into your phone shows whole degrees and has no calibration. If that's enough for the job, keep your money.
Privacy policy
Effective September 21, 2026
DumbLevel is a bubble level and wall-layout planner for iPhone. This policy is short because there is not much to say.
What we collect
Nothing. DumbLevel does not collect, store or send any personal information, usage data, crash reports or analytics. There is no account, no sign-in and no way for the app to know who you are.
What stays on your phone
Two things, both saved in the app's own storage on the phone:
- The current hang job: which job you picked and the numbers you typed, so they are still there when you come back.
- Your settings: sound choice, units, the span length, your calibration, and whether you've seen the tips.
None of this leaves the device. Deleting the app deletes all of it. If you use iCloud backup for your phone, Apple may include the app's data in that backup under your own Apple account; DumbLevel has no access to it.
The motion sensor
DumbLevel reads the iPhone's built-in tilt sensor (accelerometer, through Apple's Core Motion) for one reason: to show whether the surface the phone is resting on is level. The readings are used on the spot to draw the screen and are not recorded, stored or transmitted.
No network
The app contains no network code. It does not connect to the internet, ever. It cannot contact us, and we cannot contact it.
No third parties
There are no third-party software kits inside DumbLevel: no analytics, no advertising, no crash reporting, no social features. Your purchase is handled entirely by Apple's App Store under Apple's own privacy policy.
Children
The app is rated 4+ and collects no data from anyone, of any age.
Changes
If this policy ever changes, the new version will be posted on this page with a new effective date. Since the app has no network access, the app itself cannot notify you; this page is the record.
Contact
Questions: support@dumblevel.com
Support
Something wrong, or a shelf that still isn't straight? Email and a person answers.
Helpful to include: your iPhone model, the iOS version, whether you ran the two-step calibration, and for a hanging question, which job you picked and the numbers you typed. The Simulator on a Mac has no tilt sensor, so the level only reads on a real phone.