Bubble Level + Compass Pro vs PicoStar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Bubble Level + Compass Pro
This utility app provides a precise spirit level and compass for your iPhone and Apple Watch. Get live readings on your wrist, even when your phone's screen is out of sight. Features include bullseye, horizontal, and vertical levels with 0.1-degree precision.
- Bullseye, horizontal, and vertical levels
- 0.1-degree precision
- True and magnetic heading
- Apple Watch companion app
- Gyro or accelerometer sensor mode
- Red-light night mode
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Bubble Level + Compass Pro combines a precise spirit level, compass, and Apple Watch companion app, so when your phone is placed somewhere hard to see its screen, you can still get live readings from your wrist. No more out-of-reach setups, and no more crouching. Features: • Bullseye level plus horizontal and vertical levels with 0.1 degree precision • Bubble level units: Angle (degrees) or Incline/Slope (%) • True and magnetic heading with direction text • Magnetic declination • Apple Watch companion app • Gyro or accelerometer sensor mode • Gyro calibration offset to compensate for camera bulge or uneven phone cases • Pitch/Roll/Yaw rotation rate readouts • Compass calibration status • Red-light night mode The tool is normally included in my astronomical app (Polar Scope Align Pro), but I decided to release it as a separate app because I could not find anything with the features I wanted on the app store. (A free ad-supported version is also available)
PicoStar
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Calibrate any telescope using true-to-scale planetary images.
Screenshots
Verdict
The clearest difference is price: PicoStar at Free against Bubble Level + Compass Pro's $0.99. PicoStar also leads on update cadence (every 7 months vs every 17 months). Bubble Level + Compass Pro's advantage is in-app purchases (none vs 1) and device support (4 vs 2). On ads 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
PicoStar is free to download; Bubble Level + Compass Pro costs $0.99 up front. PicoStar sells 1 one-off in-app purchase. Bubble Level + Compass Pro asks for nothing beyond the download.
Bubble Level + Compass Pro ships an update every 17 months, PicoStar every 7 months. The most recent releases landed on October 10, 2026 and October 2, 2026 respectively.
| Parameter | Bubble Level + Compass Pro | PicoStar |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (22 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 22 — better | — |
| Update frequency | Every 17 months | Every 7 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 7 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Dimitrios Kechagias | Ryan Rudes |
In-app purchases
Bubble Level + Compass Pro
No in-app purchases
PicoStar
- Planetary Expansion Pack$9.99
Questions
Is Bubble Level + Compass Pro free?
Is PicoStar free?
Do Bubble Level + Compass Pro or PicoStar have ads?
Which is updated more often, Bubble Level + Compass Pro or PicoStar?
Other comparisons
