Image Upsample vs FourScan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Image Upsample
Enhance the clarity of your mobile photos by increasing their resolution. Simply select an image and tap a button to automatically process and magnify it, making details sharper and more visible.
- Magnify image resolution
- Automatic processing
- Improve image clarity
- Supports selected resolutions up to 1200*1200
- AI-powered enhancement
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Light-up is an app that magnifies the resolution of image, which can make image in mobile phones look clearer. After selecting the photo and touch 'light-up' button, the program will be executed automatically. After the progress bar is read out, the picture processing is completed. For images with too much noise or manual processing (such as beauty, compression, sharpening,cropped), the processing effect may not be good. Light-up only supports selected image resolution below 1200*1200 now. The current AI processing time may be slightly longer than the progress bar reading end time.
FourScan
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Protect your privacy with 4 scanning technologies. Worried about hidden cameras or listening devices in hotels, Airbnbs, or rental spaces? FourScan runs 4 detection scans sequentially with a single tap. [4 Detection Powers] 1. Magnetic Scan - Detects magnetic field anomalies from electronic devices 2. Infrared Scan - Uses front camera to detect IR LEDs from night vision cameras 3. Wi-Fi Scan - Discovers suspicious devices on the local network 4. Bluetooth Scan - Searches and analyzes nearby BLE devices Note: Basic checking tool, not a substitute for professional investigation.
Screenshots
Verdict
The clearest difference is in-app purchases: FourScan at none against Image Upsample's 4. FourScan also leads on ads (none vs shown) and update cadence (every 10 days vs every 2 months). Image Upsample's advantage is device support (3 vs 1) and iOS requirement (14.1 vs 16.0). On price 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. Image Upsample sells 4 one-off in-app purchases. FourScan asks for nothing beyond the download.
Image Upsample ships an update every 2 months, FourScan every 10 days. The most recent releases landed on September 28, 2026 and September 10, 2026 respectively.
| Parameter | Image Upsample | FourScan |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 months | Every 10 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 31 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | 子尧 纵 | satoshi amasaki |
In-app purchases
Image Upsample
- 3 Energy Ore$0.99
- 10 Energy Ore$2.99
- 36 Energy Ore$8.99
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- 120 Energy Ore$27.99
FourScan
No in-app purchases









