# RTST vs PhotoSpace Optimizer

The clearest difference is in-app purchases: RTST at none against PhotoSpace Optimizer's 2. RTST also leads on update cadence (daily vs every 3 months) and iOS requirement (12.0 vs 15.5). On price, ads and device support there is nothing between them.

Both are free to download. PhotoSpace Optimizer sells 2 in-app purchases, starting at $2.99 per month. RTST asks for nothing beyond the download.

RTST ships an update daily, PhotoSpace Optimizer every 3 months. The most recent releases landed on September 25, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | RTST | PhotoSpace Optimizer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 months |
| Size | 55 MB | 176 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [IGI KOREA Co.,Ltd.](https://appshunter.io/developer/1640433106) | [Amr Saied](https://appshunter.io/developer/1777023350) |

## What reviewers say

### RTST

[App page](https://appshunter.io/ios/app/rtst/id6504899919)

**In-app purchases:** none


### PhotoSpace Optimizer

[App page](https://appshunter.io/ios/app/photospace-optimizer/id6758412506)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $2.99 | per month |
| Yearly Subscription | $29.99 | per year |


## Frequently asked questions

### Is RTST free?

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

### Is PhotoSpace Optimizer free?

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

### Do RTST or PhotoSpace Optimizer have ads?

Neither RTST nor PhotoSpace Optimizer shows ads.

### Which is updated more often, RTST or PhotoSpace Optimizer?

RTST ships an update daily, and PhotoSpace Optimizer every 3 months. Most recently, RTST was updated on September 25, 2026 and PhotoSpace Optimizer on September 9, 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.*