Prime Number Checker vs AirSync Sender
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Prime Number Checker
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The Prime Number Checker is a fast, beautiful and handy app to determine if a certain number is a prime number. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. Prime numbers are used in many fields, including mathematics and cryptography. In cryptography, they are especially useful since big prime numbers are extremely hard to factorize. Thus, they are the core of many cryptographic algorithms.
AirSync Sender
Wirelessly share your device's screen to compatible interactive displays or multiple iOS devices. Facilitates efficient multi-person communication and collaboration through features like split screen and annotation.
- WebRTC screen sharing
- QR code sharing
- Split screen support
- Moderator mode
- Remote control
- Annotation
- Screen mirroring
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AirSync Sender is a screen sharing app specially designed for AirSync. With AirSync Sender, you can easily share your screen to AirSync devices, such as the ViewSonic ViewBoard interactive flat panel. Whether connected through the Internet or a local area network, you can use AirSync Sender to share your ideas wirelessly and create a more efficient multi-person communication environment. You can also share AirSync device screen to multiple iOS devices through AirSync sender. The main functions of AirSync Sender include: 1. Screen sharing based on WebRTC technology 2. Sharing screen through QR code 3. Split screen to support multiple sharing screens 4. Support moderator mode 5. Receive device side screen and remote control 6. Annotation 7. Screen mirroring Quick screen sharing guide: 1. Launch the AirSync application on the receiving side 2. Launch the AirSync Sender 3. Enter the display code and one-time password 4. After pressing "Next", and click "Start broadcast" System requirements: 1. iOS 11 or above 2. LAN or WAN connection required
Screenshots
Verdict
The clearest difference is device support: AirSync Sender at 4 against Prime Number Checker's 2. Prime Number Checker's advantage is iOS requirement (9.0 vs 13.0). On price, update cadence, ads 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.
Prime Number Checker ships an update every 5 weeks, AirSync Sender monthly. The most recent releases landed on October 3, 2026 and October 15, 2026 respectively.
| Parameter | Prime Number Checker | AirSync Sender |
|---|---|---|
| Price | Free | Free |
| Rating | — | 1.8 (5 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | — | 5 — better |
| Update frequency | Every 5 weeks | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 9.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 10 MB | 82 MB |
| Age rating | 4+ | 4+ |
| Developer | Adam Thuvesen | ViewSonic_International |
In-app purchases
Prime Number Checker
No in-app purchases
AirSync Sender
No in-app purchases
Questions
Is Prime Number Checker free?
Is AirSync Sender free?
Do Prime Number Checker or AirSync Sender have ads?
Which is updated more often, Prime Number Checker or AirSync Sender?
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