# RSL Central vs Image Saliency

The clearest difference is ads: RSL Central at none against Image Saliency's shown. RSL Central also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.7.2). Image Saliency's advantage is update cadence (fortnightly vs every 3 months). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

RSL Central ships an update every 3 months, Image Saliency fortnightly. The most recent releases landed on November 7, 2026 and November 14, 2026 respectively.

## The numbers

| Metric | RSL Central | Image Saliency |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Fortnightly** |
| Size | 1 MB | 38 MB |
| Requires iOS | **15.0** | 17.7.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ON SEMICONDUCTOR CORPORATION](https://appshunter.io/developer/720086766) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### RSL Central

[App page](https://appshunter.io/ios/app/rsl-central/id1562731670)

**Features:** macOS Compatibility

**In-app purchases:** none


### Image Saliency

[App page](https://appshunter.io/ios/app/image-saliency/id6511211544)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RSL Central free?

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

### Is Image Saliency free?

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

### Do RSL Central or Image Saliency have ads?

Image Saliency shows ads; RSL Central does not.

### Which is updated more often, RSL Central or Image Saliency?

RSL Central ships an update every 3 months, and Image Saliency fortnightly. Most recently, RSL Central was updated on November 7, 2026 and Image Saliency on November 14, 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.*