Comparison

Bubble Level vs Plumb

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

Head to head
About

Bubble Level

This tool helps you determine if objects are straight and level. It displays angles on your phone and can use AR for precise measurements on walls and paintings. Ideal for home tasks like hanging pictures or ensuring shelves are flat.

Highlights
  • AR laser for walls
  • Angle display during rotation
  • Portrait and landscape orientation
  • AR painting leveler
  • User-friendly interface
  • Offline functionality
Features
Read full description

Need to check if a something is straight? Use this level tool. It helps you see if shelves and pictures are flat. The level shows angles on your phone. • Use AR laser for walls • See angles as you rotate your phone • Works on side or upright • Use AR to level paintings • Easy for anyone to use • Works without internet Hang a picture straight on the wall. Make sure a shelf is flat before you put items on it. Check if a table sits level on the floor. This tool helps with many jobs at home. Start checking if it is level in seconds.

About

Plumb

This tool simulates a physical spirit level with realistic physics and fluid optics. It offers multiple display modes for angles and surfaces, with customizable feedback for precise measurements. Features include calibration, night mode, and various themes for different lighting conditions.

Highlights
  • Realistic bubble level physics
  • Surface bullseye level
  • Customizable angle measurement
  • Multiple display modes
  • Auto-orientation detection
  • Hold reading function
  • Visual, audio, and haptic feedback
Read full description

Plumb is a precision bubble level that looks and feels like the real thing — machined bezel, genuine spring-damper physics, and a vial with real fluid optics. Check level, plumb, any angle, or a whole surface at once. No ads. No account. No tracking. The bubble moves with genuine spring-damper physics. The bezel looks like machined rubber. The vial renders with real fluid optics. When you hit level, the screen flashes, a tone fires, and the phone vibrates — all at once, so you can feel it without looking. LEVEL TAB The main vial reads roll in portrait or landscape. Lock orientation from the toolbar — portrait, landscape left, landscape right, or auto. Lock a reading to free up your hands. Calibrate to any known flat surface with one tap. SURFACE TAB A bullseye level checks both axes simultaneously. Perfect for countertops, appliances, equipment, and anything that needs to be flat in every direction at once. ANGLE TAB Dial in any target angle — 45°, 22.5°, a custom pitch, or a grade percentage — and get live feedback as you approach it. Great for trim work, ramps, crown molding, roofing, and drainage slopes. SIX DISPLAY MODES Choose how angles are shown — degrees, percentage, mm/m, pitch (X.X:12), or in/ft. Each tab has its own independent display mode. Tap any readout to cycle through options. WORKS EVERY WAY YOU HOLD IT Portrait, landscape left, landscape right, face-up, face-down — Plumb reads correctly in every orientation automatically. No mode to switch, no setup required. HOLD Freeze any reading with one tap, one volume button press, or the Action button. Press again to release. A haptic confirms when hold is activated or released. FEEDBACK THAT KEEPS UP WITH YOU Tone — pitch rises as you approach level, fires a clean confirm when you hit it Flash — the camera flash pulses on level, useful in dark spaces Haptic — a firm tap through the phone the moment you're on target NIGHT MODE A dedicated all-black theme with deep red vial and glow ring. Designed for attics, crawl spaces, and low-light conditions where a bright yellow screen is a liability. SIX THEMES Yellow, Red, Black, Sky Blue, Orange, and Night mode. CALIBRATION Per-orientation calibration profiles. Calibrate portrait, landscape left, landscape right, and flat independently. Reset any profile individually or all at once. NO ADS. NO TRACKING. Plumb does one thing and does it right. Nothing phones home. Nothing asks for your email. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://nationaltoolworks.com/apps/plumb/privacy

Screenshots

Bubble Level4 screens
Plumb4 screens

Verdict

The call

The clearest difference is in-app purchases: Bubble Level at none against Plumb's 1. Bubble Level also leads on rating (4.8 vs 4.6) and ratings volume (327 vs 9). Plumb's advantage is ads (none vs shown). On price, review sentiment, update cadence and monetization model there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Plumb sells 1 in-app purchase, starting at $9.99 per year. Bubble Level asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Bubble Level holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Bubble Level has 327 ratings behind it against 9, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Bubble Level ships an update every 2 weeks, Plumb every 3 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
Bubble Level versus Plumb: the parameters behind the verdict, then further details
ParameterBubble LevelPlumb
PriceFreeFree
Rating4.8 (327 ratings) — better4.6 (9 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings327 — better9
Update frequencyEvery 2 weeks — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better16.0
Further details — not scored
Size42 MB2 MB
Age rating4+4+
DeveloperStijn AaNational Tool Works LLC

Customer experience

Bubble Level

All ratings211 ratings
Positive96.2%
Neutral0.9%
Negative2.8%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Plumb

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Bubble Level

No in-app purchases

1 purchases

Plumb

Subscriptions1
  • Plumb Pro14 Days trial$9.991 Year

Questions

Is Bubble Level free?
Bubble Level is free to download, with no in-app purchases.
Is Plumb free?
Plumb is free to download, with in-app purchases available.
Which has better reviews, Bubble Level or Plumb?
Bubble Level is rated higher. Bubble Level averages 4.8 out of 5 from 327 ratings, while Plumb averages 4.6 from 9 ratings.
Do Bubble Level or Plumb have ads?
Bubble Level shows ads; Plumb does not.
Which is updated more often, Bubble Level or Plumb?
Bubble Level ships an update every 2 weeks, and Plumb every 3 weeks. Most recently, Bubble Level was updated on October 25, 2026 and Plumb on October 24, 2026.

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