Comparison

King vs Vision Training & Eye Exercise

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Objective sideline concussion screening
  • Assess eye movements and attention
  • Administer baseline and post-injury tests
  • Works offline
  • Suitable for ages 5+
Features
Read full description

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.

About

Vision Training & Eye Exercise

Enhance your visual skills with a variety of engaging games and personalized daily workouts. Improve convergence, divergence, stereo acuity, and binocular fusion. Test and strengthen visual memory, tracking, and peripheral vision for sharper focus.

Highlights
  • Vision therapy and training
  • 28+ engaging games
  • Personalized daily workouts
  • Improve convergence and divergence
  • Enhance stereo acuity and binocular fusion
  • Test visual memory and tracking
Features
Read full description

Elevate Your Vision with the ultimate vision therapy and training app designed to enhance: - Convergence - Divergence - Stereo Acuity - Binocular Fusion 28+ Engaging Games for Vision Training & Eye Exercise Stay motivated and have fun while building stronger visual skills. Personalized Daily Workouts Your workouts automatically adjust to your progress, keeping you on track toward your goals. Test and improve: - Multiple Object Tracking - Visual Memory - Visual Discrimination - Peripheral Vision - Depth Perception Sharper Vision. Stronger Focus. Your journey begins now! Terms of Use - https://www.opticstrainer.com/terms-of-service/ Privacy Policy - https://www.opticstrainer.com/privacy-policy/

Screenshots

Vision Training & Eye Exercise4 screens

Verdict

The call

The clearest difference is rating: King at 5.0 against Vision Training & Eye Exercise's 4.5. King also leads on in-app purchases (none vs 3) and ads (none vs shown). Vision Training & Eye Exercise's advantage is update cadence (weekly vs every 2 months) and ratings volume (299 vs 2). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Vision Training & Eye Exercise sells 3 in-app purchases, starting at $4.99 per 7 days. King asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

King holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Vision Training & Eye Exercise has 299 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

King ships an update every 2 months, Vision Training & Eye Exercise weekly. The most recent releases landed on September 15, 2026 and August 26, 2026 respectively.

Scorecard8 real differences · 2 level
King versus Vision Training & Eye Exercise: the parameters behind the verdict, then further details
ParameterKingVision Training & Eye Exercise
PriceFreeFree
Rating5.0 (2 ratings) — better4.5 (299 ratings)
Positive reviews—64.7% of reviews
Number of ratings2299 — better
Update frequencyEvery 2 monthsWeekly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPadiPhone, iPad, iPod — better
Requires iOS9.0 — better15.0
Further details — not scored
Size243 MB378 MB
Age rating4+4+
DeveloperKing-Devick Test, LLCOptics Trainer LLC

Customer experience

King

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Vision Training & Eye Exercise

All ratings299 ratings
Positive90.0%
Neutral2.7%
Negative7.4%
Written reviews17 reviews
Positive64.7%
Neutral5.9%
Negative29.4%

In-app purchases

None

King

No in-app purchases

3 purchases

Vision Training & Eye Exercise

Subscriptions3
  • Weekly Subscription$4.997 Days
  • Monthly Subscription1 Month trial$14.991 Month
  • Annual Subscription1 Month trial$149.991 Year

Questions

Is King free?
King is free to download, with no in-app purchases.
Is Vision Training & Eye Exercise free?
Vision Training & Eye Exercise is free to download, with in-app purchases available.
Which has better reviews, King or Vision Training & Eye Exercise?
King is rated higher. King averages 5.0 out of 5 from 2 ratings, while Vision Training & Eye Exercise averages 4.5 from 299 ratings.
Do King or Vision Training & Eye Exercise have ads?
Vision Training & Eye Exercise shows ads; King does not.
Which is updated more often, King or Vision Training & Eye Exercise?
King ships an update every 2 months, and Vision Training & Eye Exercise weekly. Most recently, King was updated on September 15, 2026 and Vision Training & Eye Exercise on August 26, 2026.

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