# ZAP短信 vs Altitude Compass

The clearest difference is review sentiment: Altitude Compass at 95% against ZAP短信's 50%. Altitude Compass also leads on rating (5.0 vs 4.3) and update cadence (every 3 days vs fortnightly). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. ZAP短信 sells 6 in-app purchases, starting at $0.99 per month and Altitude Compass sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Altitude Compass holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 11 and 17 respectively. Written reviews point the same way: 50% of ZAP短信's written reviews are positive against 95% of Altitude Compass's.

ZAP短信 ships an update fortnightly, Altitude Compass every 3 days. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | ZAP短信 | Altitude Compass |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (11 ratings)](https://appshunter.io/ios/app/zap-ai/id1547579838/reviews) | **[5.0 (17 ratings)](https://appshunter.io/ios/app/altitude-compass/id1642364007/reviews)** |
| Number of ratings | 11 | **17** |
| Positive reviews | 50.0% of reviews | **95.1% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | Paid | Paid |
| Size | 18 MB | 3 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [经纬 郭](https://appshunter.io/developer/1159251754) | [锦滔 欧](https://appshunter.io/developer/1524196172) |

## What reviewers say

### ZAP短信

[App page](https://appshunter.io/ios/app/zap-ai/id1547579838)

This app intelligently filters and categorizes your SMS messages locally using a smart model trained on user-submitted data. It offers customizable rules for de-sensitizing and filtering various message types, enhancing privacy and organization without relying on external services.

**Highlights:** Local intelligent SMS filtering, Categorization of SMS types, Customizable de-sensitization rules, Customizable keyword and sender filtering, iCloud multi-device synchronization, Local model training via Apple Watch

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZAP Monthly | $0.99 | per month |
| ZAP Yearly | $4.99 | per year |
| A Cup of Coffee | $0.99 | one-time |
| A Lunch | $2.99 | one-time |
| Full Energy | $9.99 | one-time |
| ZAP Pro Lifetime | $12.99 | one-time |


### 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 |


## Frequently asked questions

### Is ZAP短信 free?

ZAP短信 is free to download, with in-app purchases available.

### Is Altitude Compass free?

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

### Which has better reviews, ZAP短信 or Altitude Compass?

Altitude Compass is rated higher. ZAP短信 averages 4.3 out of 5 from 11 ratings, while Altitude Compass averages 5.0 from 17 ratings.

### Do ZAP短信 or Altitude Compass have ads?

Neither ZAP短信 nor Altitude Compass shows ads.

### Which is updated more often, ZAP短信 or Altitude Compass?

ZAP短信 ships an update fortnightly, and Altitude Compass every 3 days. Most recently, ZAP短信 was updated on October 24, 2026 and Altitude Compass on October 27, 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.*