# 北極冰 雙控溫 vs Altimeter

The clearest difference is in-app purchases: 北極冰 雙控溫 at none against Altimeter's 3. 北極冰 雙控溫 also leads on iOS requirement (9.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Altimeter sells 3 in-app purchases, starting at $2.99 per 7 days. 北極冰 雙控溫 asks for nothing beyond the download.

## The numbers

| Metric | 北極冰 雙控溫 | Altimeter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 4 weeks |
| Size | 61 MB | 8 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [WENCHUN WANG](https://appshunter.io/developer/1478718242) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### 北極冰 雙控溫

[App page](https://appshunter.io/ios/app/id6451113865)

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

**In-app purchases:** none


### Altimeter

[App page](https://appshunter.io/ios/app/altimeter-gps-elevation/id6772261844)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Climb Log: Weekly | $2.99 | per 7 days |
| Summit Height: Yearly | $14.99 | per year |
| Offline Altitude: Pay Once | $29.99 | one-time |


## Frequently asked questions

### Is 北極冰 雙控溫 free?

北極冰 雙控溫 is free to download, with no in-app purchases.

### Is Altimeter free?

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

### Do 北極冰 雙控溫 or Altimeter have ads?

Neither 北極冰 雙控溫 nor Altimeter shows ads.

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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.*