SafeСalls vs SKI+ v2
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SafeСalls
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The next-gen voicecom chat
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 update cadence: SafeСalls at weekly against SKI+ v2's fortnightly. SafeСalls also leads on iOS requirement (13.0 vs 17.6). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
SafeСalls ships an update weekly, SKI+ v2 fortnightly. Both last shipped on October 25, 2026.
| Parameter | SafeСalls | SKI+ v2 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly — better | Fortnightly |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 23 MB | 249 MB |
| Age rating | 4+ | 4+ |
| Developer | Sekterra GmbH | Academia Sinica Research Center for Information Technology Innovation |
In-app purchases
SafeСalls
No in-app purchases
SKI+ v2
No in-app purchases
