# PTT vs SAR21

The clearest difference is update cadence: SAR21 at every 8 days against PTT's every 12 months. PTT's advantage is iOS requirement (9.0 vs 15.1). On price, ads, 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.

PTT ships an update every 12 months, SAR21 every 8 days. The most recent releases landed on October 14, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | PTT | SAR21 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 8 days** |
| Size | 28 MB | 24 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Corget Technology Co.,Ltd](https://appshunter.io/developer/1146811186) | [Justin Calamia](https://appshunter.io/developer/1819822028) |

## What reviewers say

### PTT

[App page](https://appshunter.io/ios/app/ptt-agent/id1591523748)

**Features:** macOS Compatibility

**In-app purchases:** none


### SAR21

[App page](https://appshunter.io/ios/app/sar21/id6747093593)

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

**In-app purchases:** none


## Frequently asked questions

### Is PTT free?

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

### Is SAR21 free?

SAR21 is free to download, with no in-app purchases.

### Do PTT or SAR21 have ads?

Neither PTT nor SAR21 shows ads.

### Which is updated more often, PTT or SAR21?

PTT ships an update every 12 months, and SAR21 every 8 days. Most recently, PTT was updated on October 14, 2026 and SAR21 on October 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*