# Altitude Compass vs 清灰

The clearest difference is price: Altitude Compass at Free against 清灰's $0.99. Altitude Compass also leads on update cadence (every 3 days vs fortnightly). 清灰's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

Altitude Compass is free to download; 清灰 costs $0.99 up front. Altitude Compass sells 2 one-off in-app purchases. 清灰 asks for nothing beyond the download.

Altitude Compass ships an update every 3 days, 清灰 fortnightly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Altitude Compass | 清灰 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (17 ratings)](https://appshunter.io/ios/app/altitude-compass/id1642364007/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 95.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Fortnightly |
| Monetization | Paid | — |
| Size | 3 MB | 10 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [锦滔 欧](https://appshunter.io/developer/1524196172) | [创宏 陈](https://appshunter.io/developer/1884920634) |

## What reviewers say

### Altitude Compass

[App page](https://appshunter.io/ios/app/altitude-compass/id1642364007)

This tool provides real-time altitude, atmospheric pressure, and location data. It includes a camera with environmental watermarks, a level gauge, speedometer, and sunrise/sunset calculations. Customize the interface and view data via widgets.

**Highlights:** Switchable altitude data sources (GPS/altimeter), Real-time camera with environmental data watermarks, Level gauge, speedometer, sunrise/sunset calculator, Customizable UI with dark/light modes, Widget support for home and lock screens, Ad-free and privacy-focused design

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3-day Trial | Free | one-time |
| Full Version Unlock | $0.99 | one-time |


### 清灰

[App page](https://appshunter.io/ios/app/id6764513416)

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

**In-app purchases:** none


## Frequently asked questions

### Is Altitude Compass free?

Altitude Compass is free to download, with in-app purchases available.

### Is 清灰 free?

清灰 costs $0.99, with no in-app purchases.

### Do Altitude Compass or 清灰 have ads?

Neither Altitude Compass nor 清灰 shows ads.

### Which is updated more often, Altitude Compass or 清灰?

Altitude Compass ships an update every 3 days, and 清灰 fortnightly. Most recently, Altitude Compass was updated on October 30, 2026 and 清灰 on October 31, 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.*