isPrime? vs GDSII Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
isPrime?
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It's a fast prime number checker.
GDSII Viewer
This utility allows users to view and analyze GDSII files, essential for semiconductor design. It offers high precision viewing, layer management, and detailed inspection tools to streamline integrated circuit design processes.
- High precision GDSII file viewing
- Layer management and toggling
- Zoom and pan functionality
- Detailed inspection tools
- Streamlines IC design process
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Description: The GDSII Viewer is a powerful tool designed for viewing and analyzing GDSII files, commonly used in the semiconductor industry. It provides a user-friendly interface and advanced features to streamline the design process of integrated circuits. Features: High Precision Viewing: Examine GDSII files with exact detail. Layer Management: Easily manage and toggle between different layers. Zoom and Pan: Effortlessly zoom in and out or pan across your designs. Detailed Inspection Tools: Utilize tools for in-depth analysis. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: isPrime? at none against GDSII Viewer's 4. isPrime? also leads on iOS requirement (15.0 vs 26.0). GDSII Viewer's advantage is update cadence (every 2 months vs every 16 months). On price, ads and device support 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. GDSII Viewer sells 4 in-app purchases, starting at $0.99 per month. isPrime? asks for nothing beyond the download.
isPrime? ships an update every 16 months, GDSII Viewer every 2 months. Both last shipped on November 4, 2026.
| Parameter | isPrime? | GDSII Viewer |
|---|---|---|
| Price | Free | Free |
| Rating | — | 1.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 16 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 4 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Omer Faruk Mesebuken | AIP Technology Corporation, Taiwan Branch |
In-app purchases
isPrime?
No in-app purchases
GDSII Viewer
- Viewer(Monthly)3 Days trial$0.991 Month
- Viewer(Annual)3 Days trial$9.991 Year
- Editor(Monthly)3 Days trial$9.991 Month
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- Editor(Annual)3 Days trial$99.991 Year
