Solar Sphere vs KeyRepoMailIOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Solar Sphere
Monitor real-time solar activity with Kp-index data and high-resolution solar images. Understand geomagnetic disturbances and their impact on Earth's magnetic field. Ideal for drone pilots needing to check conditions before flying.
- Real-time Kp-index monitoring
- High-resolution solar images
- Kp-index explanation
- Geomagnetic storm indication
- Drone flying safety guidance
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The Solar Sphere provides current value of Kp-index derived from the NOAA Space Weather Prediction Center using data from multiple ground-based magnetometers. Also, current solar images are available in 4 different high resolution formats. The Kp-index quantifies solar disturbances in the horizontal component of earth's magnetic field with an integer in the range 0-9 with 1 being calm and 5 or more indicating a geomagnetic storm. For drone flyers, please only fly on solar KP Index less than 5.
KeyRepoMailIOS
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KeyRepoMail is a private and secure email client utilising end-to-end encryption and proprietary protocol to store and transmit emails. Both sender and receiver are required to register with their login names and email addresses for notifications. Emails stay encrypted in transmission and storage and only the intended recipient can decrypt and read emails.
Screenshots
Verdict
The clearest difference is update cadence: KeyRepoMailIOS at monthly against Solar Sphere's every 9 months. Solar Sphere's advantage is device support (4 vs 2) and iOS requirement (9.0 vs 26.0). On price, 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.
Solar Sphere ships an update every 9 months, KeyRepoMailIOS monthly. The most recent releases landed on June 1, 2026 and September 2, 2026 respectively.
| Parameter | Solar Sphere | KeyRepoMailIOS |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (6 ratings) — better | — |
| Positive reviews | 44.4% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 9 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 3 MB | 16 MB |
| Age rating | 17+ | 4+ |
| Developer | Pulsely Consulting Limited | Key Repository Limited Liability Company |
In-app purchases
Solar Sphere
No in-app purchases
KeyRepoMailIOS
No in-app purchases
