# ARMAS vs Solar Activity

The clearest difference is review sentiment: ARMAS at 100% against Solar Activity's 25%. ARMAS also leads on rating (4.3 vs 1.0) and ads (none vs shown). Solar Activity's advantage is in-app purchases (none vs 3). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. ARMAS sells 3 in-app purchases, starting at $2.99 per year. Solar Activity asks for nothing beyond the download.

ARMAS holds the better App Store score, 4.3 against 1.0. That said, the two scores are not equally well evidenced: ARMAS has 6 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of ARMAS's written reviews are positive against 25% of Solar Activity's.

ARMAS ships an update every 2 months, Solar Activity every 3 months. The most recent releases landed on September 28, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | ARMAS | Solar Activity |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/armas/id1446097782/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/solar-activity/id1460144397/reviews) |
| Number of ratings | **6** | 1 |
| Positive reviews | **100.0% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 38 MB | 33 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Space Environment Technologies, LLC.](https://appshunter.io/developer/1446097781) | [Pavel Koyushev](https://appshunter.io/developer/1257728721) |

## What reviewers say

### ARMAS

[App page](https://appshunter.io/ios/app/armas/id1446097782)

Real-time radiation monitoring for aviation and space weather awareness. Pairs with hardware detectors or provides data from global systems for pilots and travelers.

**Highlights:** Real-time radiation monitoring, Space weather awareness, Pairs with ARMAS Flight Modules, Detects various radiation types, Global airspace coverage, Data from ground and space systems

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premier | $2.99 | per year |
| Professional | $2.99 | per year |
| Member | $2.99 | one-time |


### Solar Activity

[App page](https://appshunter.io/ios/app/solar-activity/id1460144397)

Track solar activity with a forecast for magnetic storms up to 27 days in advance. View the latest images and videos of the sun, and monitor key metrics like the Kp index and sunspots.

**Highlights:** Magnetic storm forecast, Kp index forecast (3-27 days), Aurora borealis predictions, Sunspot tracking, Solar wind monitoring, Latest SOHO/SDO images & videos

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ARMAS free?

ARMAS is free to download, with in-app purchases available.

### Is Solar Activity free?

Solar Activity is free to download, with no in-app purchases.

### Which has better reviews, ARMAS or Solar Activity?

ARMAS is rated higher. ARMAS averages 4.3 out of 5 from 6 ratings, while Solar Activity averages 1.0 from 1 ratings.

### Do ARMAS or Solar Activity have ads?

Solar Activity shows ads; ARMAS does not.

### Which is updated more often, ARMAS or Solar Activity?

ARMAS ships an update every 2 months, and Solar Activity every 3 months. Most recently, ARMAS was updated on September 28, 2026 and Solar Activity on September 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*