# ImPACT Toolkit vs King

The clearest difference is rating: King at 5.0 against ImPACT Toolkit's 3.0. ImPACT Toolkit's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. King sells 1 in-app purchase, starting at $7.99 per month. ImPACT Toolkit asks for nothing beyond the download.

King holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

ImPACT Toolkit ships an update every 4 months, King every 2 months. The most recent releases landed on October 26, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | ImPACT Toolkit | King |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/impact-toolkit/id972072793/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/king-devick-migraine-headache/id1359829374/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 205 MB | 220 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 17+ | 12+ |
| Developer | [ImPACT Applications, Inc.](https://appshunter.io/developer/466881804) | [King-Devick Test, LLC](https://appshunter.io/developer/424793545) |

## What reviewers say

### ImPACT Toolkit

[App page](https://appshunter.io/ios/app/impact-toolkit/id972072793)

This application allows healthcare professionals to administer concussion evaluation tests. It supports online and offline administration of ImPACT, ImPACT Pediatric, and ImPACT Quick Test, with results uploaded to a central database. A customer account is required for use.

**Highlights:** Administer ImPACT tests, Administer ImPACT Pediatric tests, Administer ImPACT Quick Test, Online and offline test administration, Upload test results to database, Record concussion evaluation findings

**In-app purchases:** none


### King

[App page](https://appshunter.io/ios/app/king-devick-migraine-headache/id1359829374)

This app helps individuals with a history of migraines detect the early prodrome phase before a headache begins. It uses a guided eye movement test with automated speech recognition to analyze performance and compare it to past results, potentially aiding in timely treatment.

**Highlights:** Migraine prodrome detection, Saccadic eye movement test, Automated speech recognition analysis, Comparison to historical test data, Guided test administration, Early intervention support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Subscription | $7.99 | per month |


## Frequently asked questions

### Is ImPACT Toolkit free?

ImPACT Toolkit is free to download, with no in-app purchases.

### Is King free?

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

### Which has better reviews, ImPACT Toolkit or King?

King is rated higher. ImPACT Toolkit averages 3.0 out of 5 from 2 ratings, while King averages 5.0 from 2 ratings.

### Do ImPACT Toolkit or King have ads?

Neither ImPACT Toolkit nor King shows ads.

### Which is updated more often, ImPACT Toolkit or King?

ImPACT Toolkit ships an update every 4 months, and King every 2 months. Most recently, ImPACT Toolkit was updated on October 26, 2026 and King on November 2, 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.*