Bubble Level + Compass vs iOptron Commander (iOS)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Horizontal and vertical level measurements
- Surface angle readings
- True north compass
- Advanced calibration
- Magnetic declination reading
- Accelerometer/Gyro switch
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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.
iOptron Commander (iOS)
Control your iOptron telescope mount remotely using your iOS device. This utility allows for basic functions like slewing to celestial objects, syncing time and location, and managing compatible mount series.
- Remote telescope mount control
- Slew to stars and deepsky objects
- Sync time and site from iOS
- Supports HEM, HAE, HAZ, CEM, GEM series mounts
- Basic control functions
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This is an application for owner of iOptron telescope mounts to remote control their telescope mounts via iOS devices. This lite version has some basic function such as slew to famous stars, named deepsky objects, solar system, sync time and site from iOS devices, and etc. Compatible product list: All HEM series All HAE series All HAZ.series CEM120 series CEM70 series GEM45 series CEM40 series GEM28 series CEM26 series SkyHunter
Screenshots
Verdict
The clearest difference is review sentiment: Bubble Level + Compass at 90% against iOptron Commander (iOS)'s 6%. Bubble Level + Compass also leads on rating (5.0 vs 1.9) and iOS requirement (12.0 vs 18.6). iOptron Commander (iOS)'s advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, ratings volume, update cadence and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Bubble Level + Compass holds the better App Store score, 5.0 against 1.9. Both are backed by a comparable volume of ratings — 34 and 14 respectively. Written reviews point the same way: 90% of Bubble Level + Compass's written reviews are positive against 6% of iOptron Commander (iOS)'s.
Bubble Level + Compass ships an update every 4 months, iOptron Commander (iOS) every 6 months. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.
| Parameter | Bubble Level + Compass | iOptron Commander (iOS) |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (34 ratings) — better | 1.9 (14 ratings) |
| Positive reviews | 90.5% of reviews — better | 6.3% of reviews |
| Number of ratings | 34 — better | 14 |
| Update frequency | Every 4 months — better | Every 6 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 18 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Dimitrios Kechagias | 成城 徐 |
Customer experience
Bubble Level + Compass
iOptron Commander (iOS)
In-app purchases
Bubble Level + Compass
No in-app purchases
iOptron Commander (iOS)
No in-app purchases
Questions
Is Bubble Level + Compass free?
Is iOptron Commander (iOS) free?
Which has better reviews, Bubble Level + Compass or iOptron Commander (iOS)?
Do Bubble Level + Compass or iOptron Commander (iOS) have ads?
Which is updated more often, Bubble Level + Compass or iOptron Commander (iOS)?
Other comparisons
