Comparison

Bubble Level + Compass vs NagTag

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

Head to head
About

Bubble Level + Compass

This utility app provides a precise bubble level for horizontal, vertical, and surface angle measurements, along with a true-north compass. It offers advanced calibration options and works on iOS devices. A Pro version is available for additional features.

Highlights
  • Horizontal and vertical level measurements
  • Surface angle readings
  • True north compass
  • Advanced calibration
  • Magnetic declination reading
  • Accelerometer/Gyro switch
Features
Read full description

Bubble Level + Compass combines a bubble level and a compass, with advanced controls for users who want more than the basics. Use it to check horizontal/vertical/surface angles, or get compass direction relative to either true or magnetic north. For users who work with physical compasses, magnetic declination is also provided to convert magnetic readings to true north readings. The level includes gyroscope calibration, which is especially useful on phones with a raised camera bump or an uneven back/case. No nagging popups or interruptions. The free version only includes a small banner ad at the bottom. Features • Bullseye level plus horizontal and vertical levels with 0.1 degree precision. • Compass with true north and magnetic north. • Magnetic declination display for converting magnetic readings to true north readings. • Gyroscope calibration for phones that do not rest perfectly flat. • Gyro or accelerometer sensor mode. • Clean interface with no popup interruptions. If you enjoy the app, leaving a review would help. An ad-free Pro version is also available, with more features including Apple Watch support, night mode, slope/inclination %, and pitch, yaw, and roll rotation rate.

About

NagTag

Features
Read full description

Create a reminder in a fraction of a second: Snap a pic and we’ll pop up a notification every half hour to make sure you don't forget. Perfect if you've left something on the stove or need to remember to let the dog back in. How does it work? 1. Snap a pic of what you need to remember 2. Get a notification every half hour for the next ten hours to make sure you don't forget it 3. Dismiss the nag notification when you're done

Screenshots

Bubble Level + Compass3 screens
NagTag4 screens

Verdict

The call

The clearest difference is ads: NagTag at none against Bubble Level + Compass's shown. Bubble Level + Compass's advantage is update cadence (every 4 months vs every 19 months). On price, in-app purchases, device support and iOS requirement 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Bubble Level + Compass ships an update every 4 months, NagTag every 19 months. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

Scorecard2 real differences · 8 level
Bubble Level + Compass versus NagTag: the parameters behind the verdict, then further details
ParameterBubble Level + CompassNagTag
PriceFreeFree
Rating5.0 (35 ratings) — better—
Positive reviews90.5% of reviews—
Number of ratings35 — better—
Update frequencyEvery 4 months — betterEvery 19 months
AdsYesNo — better
In-app purchasesNoNo
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size18 MB14 MB
Age rating4+4+
DeveloperDimitrios KechagiasKOALABRAIN LTD

In-app purchases

None

Bubble Level + Compass

No in-app purchases

None

NagTag

No in-app purchases

Questions

Is Bubble Level + Compass free?
Bubble Level + Compass is free to download, with no in-app purchases.
Is NagTag free?
NagTag is free to download, with no in-app purchases.
Do Bubble Level + Compass or NagTag have ads?
Bubble Level + Compass shows ads; NagTag does not.
Which is updated more often, Bubble Level + Compass or NagTag?
Bubble Level + Compass ships an update every 4 months, and NagTag every 19 months. Most recently, Bubble Level + Compass was updated on November 2, 2026 and NagTag on October 30, 2026.

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