# iOptron Optical Polar Scope vs Bubble Level + Compass

The clearest difference is review sentiment: Bubble Level + Compass at 90% against iOptron Optical Polar Scope's 20%. Bubble Level + Compass also leads on price (Free vs $1.99) and rating (5.0 vs 2.7). iOptron Optical Polar Scope's advantage is ads (none vs shown). On ratings volume, update cadence, in-app purchases and device support there is nothing between them.

Bubble Level + Compass is free to download; iOptron Optical Polar Scope costs $1.99 up front. 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 2.7. Both are backed by a comparable volume of ratings — 12 and 35 respectively. Written reviews point the same way: 20% of iOptron Optical Polar Scope's written reviews are positive against 90% of Bubble Level + Compass's.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | iOptron Optical Polar Scope | Bubble Level + Compass |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [2.7 (12 ratings)](https://appshunter.io/ios/app/ioptron-optical-polar-scope/id564078961/reviews) | **[5.0 (35 ratings)](https://appshunter.io/ios/app/bubble-level-plus-compass/id1374372463/reviews)** |
| Number of ratings | 12 | **35** |
| Positive reviews | 20.0% of reviews | **90.5% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 18 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [成城 徐](https://appshunter.io/developer/564078964) | [Dimitrios Kechagias](https://appshunter.io/developer/970157964) |

## What reviewers say

### iOptron Optical Polar Scope

[App page](https://appshunter.io/ios/app/ioptron-optical-polar-scope/id564078961)

This utility app assists in accurately aligning telescope mounts by showing the precise position of the Pole Star within the polar scope. It employs a sophisticated algorithm to account for various astronomical factors, ensuring sub-arcsecond accuracy for astrophotography and observation.

**Highlights:** Pole Star position calculation, Sub-arcsecond accuracy algorithm, 10-minute marker reticle, Supports Northern and Southern Hemispheres, Manual location entry option

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Bubble Level + Compass

[App page](https://appshunter.io/ios/app/bubble-level-plus-compass/id1374372463)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iOptron Optical Polar Scope free?

iOptron Optical Polar Scope costs $1.99, with no in-app purchases.

### Is Bubble Level + Compass free?

Bubble Level + Compass is free to download, with no in-app purchases.

### Which has better reviews, iOptron Optical Polar Scope or Bubble Level + Compass?

Bubble Level + Compass is rated higher. iOptron Optical Polar Scope averages 2.7 out of 5 from 12 ratings, while Bubble Level + Compass averages 5.0 from 35 ratings.

### Do iOptron Optical Polar Scope or Bubble Level + Compass have ads?

Bubble Level + Compass shows ads; iOptron Optical Polar Scope does not.

### Which is updated more often, iOptron Optical Polar Scope or Bubble Level + Compass?

iOptron Optical Polar Scope ships an update every 4 months, and Bubble Level + Compass every 4 months. Most recently, iOptron Optical Polar Scope was updated on October 26, 2026 and Bubble Level + Compass on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*