King vs Modus Research
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
King
This app provides a quick and objective sideline concussion screening test for athletes. It helps identify potential concussions by assessing eye movements, attention, and concentration through a simple number-reading exercise. Requires an existing King-Devick Online account.
- Objective sideline concussion screening
- Assess eye movements and attention
- Administer baseline and post-injury tests
- Works offline
- Suitable for ages 5+
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This app is intended ONLY for users with an existing King-Devick Online account. The King-Devick Concussion Screening Test is an objective, remove-from-play sideline concussion screening test which can be administered by parents, coaches, athletic trainers or medical professionals in minutes. Peer reviewed published research has shown that the King-Devick Test is an accurate and reliable method to help identify athletes with concussion on the sidelines. It has particular relevance to sports such as football, hockey, soccer, and basketball in addition to all other contact or collision activities on the field or at home. The test involves reading aloud a series of single digit numbers from left to right on three test cards. The King-Devick can detect impairment of eye movements, attention, language, concentration and other areas which correlate with concussion. How does King-Devick Test work? -King-Devick Test account holders get unlimited concussion screening per athlete per year. -With the King-Devick Test App, you can administer baseline and post-injury assessments even when WiFi is not available. -All athletes establish a pre-season or pre-injury baseline test score annually. -Concussion screening for athletes as young as 5 years old.
Modus Research
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Modus RE is designed for use with the StepWatch activity monitor. Learn more at https://modushealth.com/
Verdict
The clearest difference is update cadence: King at every 2 months against Modus Research's every 7 months. King also leads on iOS requirement (9.0 vs 12.0). On price, ads, in-app purchases and device support 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.
King ships an update every 2 months, Modus Research every 7 months. The most recent releases landed on October 2, 2026 and October 13, 2026 respectively.
| Parameter | King | Modus Research |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 months — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPad | iPad |
| Requires iOS | 9.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 243 MB | 73 MB |
| Age rating | 4+ | 4+ |
| Developer | King-Devick Test, LLC | Modus Health Llc |
In-app purchases
King
No in-app purchases
Modus Research
No in-app purchases
