# Solar Activity vs Въздух БГ

The clearest difference is update cadence: Въздух БГ at monthly against Solar Activity's every 3 months. Въздух БГ also leads on review sentiment (33% vs 25%). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Solar Activity ships an update every 3 months, Въздух БГ monthly. The most recent releases landed on November 3, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Solar Activity | Въздух БГ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/solar-activity/id1460144397/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 25.0% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Ad-supported | Ad-supported |
| Size | 33 MB | 4 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pavel Koyushev](https://appshunter.io/developer/1257728721) | [Tihomir Radev](https://appshunter.io/developer/1403507147) |

## What reviewers say

### 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


### Въздух БГ

[App page](https://appshunter.io/ios/app/id1565137583)

Get real-time air quality data for Bulgarian cities, including fine particulate matter levels. Track air quality across the country with an integrated map and view hourly updates. Customizable widgets provide instant air quality information for selected locations without opening the app.

**Highlights:** Real-time air quality data, Fine particulate matter levels, Hourly air quality updates, Integrated national map, Customizable widgets

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

**In-app purchases:** none


## Frequently asked questions

### Is Solar Activity free?

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

### Is Въздух БГ free?

Въздух БГ is free to download, with no in-app purchases.

### Do Solar Activity or Въздух БГ have ads?

Both Solar Activity and Въздух БГ show ads.

### Which is updated more often, Solar Activity or Въздух БГ?

Solar Activity ships an update every 3 months, and Въздух БГ monthly. Most recently, Solar Activity was updated on November 3, 2026 and Въздух БГ on November 11, 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.*