RSL Central vs Image Saliency
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RSL Central
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An easy-to-use app to get started with onsemi Bluetooth Low Energy wireless microcontrollers and periphery devices. RSL Central scans for and establishes a Bluetooth Low Energy connection with onsemi Bluetooth Low Energy wireless microcontrollers. The app displays fields such as measured battery level, voltage, current, LED status, push button status, or others depending on the onsemi wireless microcontroller and configuration.
Image Saliency
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Detect quantify and visualize the key part of an image or where in the image people are likely to look. ※Image saliency(Objectness Based)
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | RSL Central | Image Saliency |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.7.2 |
| Further details — not scored | ||
| Size | 1 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | ON SEMICONDUCTOR CORPORATION | Hideaki Uchikoshi |
In-app purchases
RSL Central
No in-app purchases
Image Saliency
No in-app purchases
Questions
Is RSL Central free?
Is Image Saliency free?
Do RSL Central or Image Saliency have ads?
Which is updated more often, RSL Central or Image Saliency?
Other comparisons
