Comparison

Bubble Level + Compass Pro vs SynScan

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 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.

Highlights
  • 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
Features
Read full description

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)

About

SynScan

Control motorized telescope mounts for celestial object tracking and exploration. Features include GOTO functionality, object catalogs, and gamepad navigation. Ideal for novice users with alt-azimuth mounts.

Highlights
  • Control telescope mount slew, align, GOTO, and track
  • Point and Track celestial objects
  • Support gamepad navigation
  • Browse and save celestial object catalogs
  • Third-party app integration (ASCOM, SkySafari, Stellarium)
  • Emulator mount for testing
Features
Read full description

Use the SynScan app to control Sky-Watcher telescope mounts via Wi-Fi or Bluetooth LE. Mounts without built-in Wi-Fi can be supported via a SynScan Wi-Fi adapter. This version of the SynScan app is suited for novice users using alt-azimuth mounts. Features - Control telescope mount to slew, align, GOTO and track. - Point And Track: track celestial objects (including the Sun and planets) without aligning. - Support gamepad navigation. - Browse a catalog of stars, comets, and deep sky objects. Or, save your own objects. - Provide access to mount for use by third-party apps, including ASCOM clients, SkySafari, Luminos, Stellarium Mobile Plus, Stellarium Desktop or customer-developed apps. Also set up mount alignment for Luminos, Skysafari. - Support access to the mount and the SynScan app from any platform that supports TCP/UDP connections. - Provide emulator mount for testing and practicing. - Track fast-moving earth satellites by working with the PreviSat app on Windows PC or the Lumios app on iOS devices.

Screenshots

Bubble Level + Compass Pro4 screens
SynScan3 screens

Verdict

The call

The clearest difference is review sentiment: Bubble Level + Compass Pro at 100% against SynScan's 22%. Bubble Level + Compass Pro also leads on rating (5.0 vs 3.3) and iOS requirement (12.0 vs 14.0). SynScan's advantage is price (Free vs $0.99) and update cadence (every 2 months vs every 17 months). On ratings volume, ads, in-app purchases and device support 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

SynScan is free to download; Bubble Level + Compass Pro costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Bubble Level + Compass Pro holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 22 and 8 respectively. Written reviews point the same way: 100% of Bubble Level + Compass Pro's written reviews are positive against 22% of SynScan's.

UpkeepUpdate frequency

Bubble Level + Compass Pro ships an update every 17 months, SynScan every 2 months. The most recent releases landed on September 10, 2026 and June 1, 2026 respectively.

Scorecard6 real differences · 4 level
Bubble Level + Compass Pro versus SynScan: the parameters behind the verdict, then further details
ParameterBubble Level + Compass ProSynScan
Price$0.99Free — better
Rating5.0 (22 ratings) — better3.3 (8 ratings)
Positive reviews100.0% of reviews — better22.2% of reviews
Number of ratings22 — better8
Update frequencyEvery 17 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, iPod
Requires iOS12.0 — better14.0
Further details — not scored
Size7 MB46 MB
Age rating4+4+
DeveloperDimitrios KechagiasAstropower Technology Co. Ltd.

Customer experience

Bubble Level + Compass Pro

All ratings22 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews13 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SynScan

All ratings8 ratings
Positive37.5%
Neutral37.5%
Negative25.0%
Written reviews18 reviews
Positive22.2%
Neutral16.7%
Negative61.1%

In-app purchases

None

Bubble Level + Compass Pro

No in-app purchases

None

SynScan

No in-app purchases

Questions

Is Bubble Level + Compass Pro free?
Bubble Level + Compass Pro costs $0.99, with no in-app purchases.
Is SynScan free?
SynScan is free to download, with no in-app purchases.
Which has better reviews, Bubble Level + Compass Pro or SynScan?
Bubble Level + Compass Pro is rated higher. Bubble Level + Compass Pro averages 5.0 out of 5 from 22 ratings, while SynScan averages 3.3 from 8 ratings.
Do Bubble Level + Compass Pro or SynScan have ads?
Neither Bubble Level + Compass Pro nor SynScan shows ads.
Which is updated more often, Bubble Level + Compass Pro or SynScan?
Bubble Level + Compass Pro ships an update every 17 months, and SynScan every 2 months. Most recently, Bubble Level + Compass Pro was updated on September 10, 2026 and SynScan on June 1, 2026.

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