Comparison

Plumbline Studio vs Bubble Level

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Plumbline Studio

Features
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Plumbline Studio turns your iPhone into a focused measurement bench for carpenters, remodelers, inspectors, installers, and careful homeowners. Use it when you need a level, plumb check, protractor, slope calculator, flatness scan, or trade math without opening a pile of separate utilities. Core tools: - Live bubble level with tap-to-zero calibration - Dual-axis bullseye readout for cabinets, benches, shelves, and trim - AR-style plumb planning view for checking vertical alignment - Protractor and inclinometer with hold-to-lock angle capture - Slope calculator with rise, run, degrees, percent grade, and ratio - Stair, rafter, crown, board-foot, and cut-list helpers - Flatness scan for spotting dips and bumps across a surface - Project journal for saved measurements, notes, client names, and locations Plumbline Studio is built around practical job flow. Take a reading, lock it, copy it, save it to a project, and keep moving. The interface is designed for repeated work in a shop, basement, garage, or jobsite, not for a one-time novelty measurement. The app stores projects locally on your device. Camera and photo access are used only when you choose to attach a reference image to a measurement.

About

Bubble Level

Features
Read full description

A bubble level, plumb bob and angle finder in one app โ€” hold your phone against a wall, post or shelf and read the exact tilt in degrees, percent grade 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 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 rail on the first try instead of nudging and re-checking - See if a worktop, tile or table is flat on both axes, and exactly which edge to shim - Read any slope three ways โ€” degrees, percent grade, or rise-in-12 roof pitch โ€” with no math - 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 prove what was true when you left the job PERFECT FOR - DIYers hanging frames, shelves, mirrors and curtain rails - Carpenters, 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 โ€” 0.4 degrees of lean, low on the right โ€” 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. 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 Premium unlocks the full toolkit โ€” plumb bob, spirit level, surface check, the angle finder with percent and roof-pitch units, fine calibration, and the saved measurement log. Choose a weekly plan, a yearly plan, or a one-time lifetime purchase. 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

Screenshots

Plumbline Studio4 screens
Bubble Level4 screens

Verdict

The call

The clearest difference is price: Bubble Level at Free against Plumbline Studio's $2.99. Plumbline Studio's advantage is in-app purchases (none vs 3) and update cadence (every 10 days vs monthly). On ads, device support and iOS requirement there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Bubble Level is free to download; Plumbline Studio costs $2.99 up front. Bubble Level sells 3 in-app purchases, starting at $4.99 per 7 days. Plumbline Studio asks for nothing beyond the download.

UpkeepUpdate frequency

Plumbline Studio ships an update every 10 days, Bubble Level monthly. The most recent releases landed on September 8, 2026 and September 21, 2026 respectively.

Scorecard3 real differences ยท 3 level
Plumbline Studio versus Bubble Level: the parameters behind the verdict, then further details
ParameterPlumbline StudioBubble Level
Price$2.99Free โ€” better
Update frequencyEvery 10 days โ€” betterMonthly
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPad โ€” betteriPhone
Requires iOS17.017.0
Further details โ€” not scored
Size3 MB5 MB
Age rating4+4+
DeveloperRobert CorbinPhuc Pham

In-app purchases

None

Plumbline Studio

No in-app purchases

3 purchases

Bubble Level

Subscriptions2
  • Bubble Gauge Weekly$4.997 Days
  • Slope Finder Yearly$24.991 Year
One-time1
  • Angle Meter, Pay Once$49.99

Questions

Is Plumbline Studio free?
Plumbline Studio costs $2.99, with no in-app purchases.
Is Bubble Level free?
Bubble Level is free to download, with in-app purchases available.
Do Plumbline Studio or Bubble Level have ads?
Neither Plumbline Studio nor Bubble Level shows ads.
Which is updated more often, Plumbline Studio or Bubble Level?
Plumbline Studio ships an update every 10 days, and Bubble Level monthly. Most recently, Plumbline Studio was updated on September 8, 2026 and Bubble Level on September 21, 2026.

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