# Bubble Level + Compass vs MLAstro Hub

The clearest difference is ads: MLAstro Hub at none against Bubble Level + Compass's shown. MLAstro Hub also leads on update cadence (every 5 days vs every 4 months) and monetization model (free vs free with in-app purchases). Bubble Level + Compass's advantage is ratings volume (34 vs 1) and iOS requirement (12.0 vs 15.0). On price, rating, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Bubble Level + Compass against 5.0 for MLAstro Hub. That said, the two scores are not equally well evidenced: Bubble Level + Compass has 34 ratings behind it against 1, so its average is the more settled of the two.

Bubble Level + Compass ships an update every 4 months, MLAstro Hub every 5 days. The most recent releases landed on September 30, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Bubble Level + Compass | MLAstro Hub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (34 ratings)](https://appshunter.io/ios/app/bubble-level-plus-compass/id1374372463/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/mlastro-hub/id6767999378/reviews) |
| Number of ratings | **34** | 1 |
| Positive reviews | 90.5% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 18 MB | 86 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dimitrios Kechagias](https://appshunter.io/developer/970157964) | [To Ngoc Khanh](https://appshunter.io/developer/1732662702) |

## What reviewers say

### 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


### MLAstro Hub

[App page](https://appshunter.io/ios/app/mlastro-hub/id6767999378)

Control your OnStep telescope mount wirelessly from your phone. Manage mount status, navigate celestial catalogs, and perform alignment and configuration tasks without a laptop.

**Highlights:** Live mount status monitoring, Directional control with adjustable slew rates, One-tap home and park functionality, Access to celestial object catalogs for Go-To slewing, Guided alignment workflow, Flexible Wi-Fi network setup, Configuration and tuning options

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Bubble Level + Compass free?

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

### Is MLAstro Hub free?

MLAstro Hub is free to download, with no in-app purchases.

### Which has better reviews, Bubble Level + Compass or MLAstro Hub?

Bubble Level + Compass and MLAstro Hub are both rated 5.0 out of 5 on the App Store, from 34 and 1 ratings respectively.

### Do Bubble Level + Compass or MLAstro Hub have ads?

Bubble Level + Compass shows ads; MLAstro Hub does not.

### Which is updated more often, Bubble Level + Compass or MLAstro Hub?

Bubble Level + Compass ships an update every 4 months, and MLAstro Hub every 5 days. Most recently, Bubble Level + Compass was updated on September 30, 2026 and MLAstro Hub on September 23, 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.*