# EF Scale vs Solar Activity Pro

The clearest difference is in-app purchases: EF Scale at none against Solar Activity Pro's 3. EF Scale also leads on rating (4.5 vs 4.2) and review sentiment (67% vs 50%). Solar Activity Pro's advantage is update cadence (fortnightly vs every 20 months) and iOS requirement (17 vs 26.0). On price, ratings volume, ads and device support there is nothing between them.

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

EF Scale holds the better App Store score, 4.5 against 4.2. Both are backed by a comparable volume of ratings — 4 and 5 respectively. Written reviews point the same way: 67% of EF Scale's written reviews are positive against 50% of Solar Activity Pro's.

EF Scale ships an update every 20 months, Solar Activity Pro fortnightly. The most recent releases landed on August 8, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | EF Scale | Solar Activity Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (4 ratings)](https://appshunter.io/ios/app/ef-scale/id418856071/reviews)** | [4.2 (5 ratings)](https://appshunter.io/ios/app/solar-activity-pro/id1545198636/reviews) |
| Number of ratings | 4 | **5** |
| Positive reviews | **66.7% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | **Fortnightly** |
| Monetization | **Free** | Subscription |
| Size | 18 MB | 40 MB |
| Requires iOS | 26.0 | **17** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [WeatherWary LLC](https://appshunter.io/developer/418856074) | [Pavel Koyushev](https://appshunter.io/developer/1257728721) |

## What reviewers say

### EF Scale

[App page](https://appshunter.io/ios/app/ef-scale/id418856071)

Assess tornado and wind damage with this tool that simplifies the Enhanced Fujita (EF) Scale. Follow on-screen prompts to select damage indicators and degrees of damage, then adjust for construction variability to estimate wind speeds.

**Highlights:** Simplified EF Scale assessment, Damage indicator selection, Degree of damage input, Construction variability adjustment, Visual damage examples, About and share functions

**Features:** Vision Pro support

**In-app purchases:** none


### Solar Activity Pro

[App page](https://appshunter.io/ios/app/solar-activity-pro/id1545198636)

Monitor solar activity and its potential effects on well-being and technology. Get aurora forecasts, real-time data, and customizable widgets. Stay informed about space weather events with detailed indicators and notifications.

**Highlights:** Widgets for solar activity, Push notifications, Aurora forecast and cameras, KP and AP index tracking, Solar wind and electron/proton flux data, Sunspot and electron content maps

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $2.99 | per month |
| 3 Months subscription | $6.99 | per 3 months |
| Yearly subscription | $17.99 | per year |


## Frequently asked questions

### Is EF Scale free?

EF Scale is free to download, with no in-app purchases.

### Is Solar Activity Pro free?

Solar Activity Pro is free to download, with in-app purchases available.

### Which has better reviews, EF Scale or Solar Activity Pro?

EF Scale is rated higher. EF Scale averages 4.5 out of 5 from 4 ratings, while Solar Activity Pro averages 4.2 from 5 ratings.

### Do EF Scale or Solar Activity Pro have ads?

Neither EF Scale nor Solar Activity Pro shows ads.

### Which is updated more often, EF Scale or Solar Activity Pro?

EF Scale ships an update every 20 months, and Solar Activity Pro fortnightly. Most recently, EF Scale was updated on August 8, 2026 and Solar Activity Pro on September 25, 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.*