# Shield vs Altimeter

The clearest difference is update cadence: Shield at weekly against Altimeter's every 4 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Shield sells 2 in-app purchases, starting at $5.99 per month and Altimeter sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Shield ships an update weekly, Altimeter every 4 weeks. The most recent releases landed on October 28, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Shield | Altimeter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 4 weeks |
| Size | 13 MB | 8 MB |
| Requires iOS | 18.5 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Alexandr Korsak](https://appshunter.io/developer/1447001028) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### Shield

[App page](https://appshunter.io/ios/app/shield-scam-text-blocker-ai/id6757823397)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $5.99 | per month |
| Yearly | $39.99 | per year |


### 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 Shield free?

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

### Is Altimeter free?

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

### Do Shield or Altimeter have ads?

Neither Shield nor Altimeter shows ads.

### Which is updated more often, Shield or Altimeter?

Shield ships an update weekly, and Altimeter every 4 weeks. Most recently, Shield was updated on October 28, 2026 and Altimeter on October 20, 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.*