iPhO vs SKI+ v2
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iPhO
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iPhO features: 1. Supports making SIP VoIP calls service. 2. Incoming Calls via Push Notifications. 3. Supports Transfer Call. 4. CallKit Support 5. Dial Plan 6. Dual Line 7. Conference
SKI+ v2
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SKI+ v2 is an end-to-end instant messaging app with in-depth support of post-quantum encryption algorithms. Message encryption and decryption are completed on the user's device, and the server has no access to these details. Therefore, it provides users with a more privacy-protected messaging system. For more details, please refer to https://www.e2eelab.org. Feel free to download and use it. If you have any questions or suggestions, please send relevant descriptions or screenshots to: ziv@citi.sinica.edu.tw. We will address your inquiries promptly.
Screenshots
Verdict
The clearest difference is iOS requirement: iPhO at 14.0 against SKI+ v2's 17.6. 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.
iPhO ships an update every 2 weeks, SKI+ v2 fortnightly. The most recent releases landed on August 20, 2026 and September 10, 2026 respectively.
| Parameter | iPhO | SKI+ v2 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 20 MB | 249 MB |
| Age rating | 4+ | 4+ |
| Developer | KeyStone Semiconductor Corp. | Academia Sinica Research Center for Information Technology Innovation |
In-app purchases
iPhO
No in-app purchases
SKI+ v2
No in-app purchases
