Optics Trainer vs King
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Optics Trainer
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.
- 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
Read full descriptionHide full description
Elevate your vision and sharpen your mind with the ultimate vision therapy and brain training app, designed to enhance: - Convergence - Divergence - Stereo Acuity - Binocular Fusion 30 Engaging Games for Vision Training, Eye Exercise & Brain Training Stay motivated and have fun while building stronger visual and cognitive skills: attention, memory, speed, tracking and problem solving. Personalized Daily Workouts A new workout every day. Every game adapts its level to you, keeping you on track toward your goals. 3D Glasses Mode Put on red-blue glasses and play games designed to train both eyes together. Test and improve: - Multiple Object Tracking - Visual Memory - Visual Discrimination - Peripheral Vision - Depth Perception Track Your Progress Follow your streak, your level in every game, and your training scores by category. Sign in to keep your progress on all your devices. Premium Unlimited play with no ads, 3D Glasses games, progress charts, and your choice of level. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your App Store account settings. Sharper Vision. Stronger Focus. Your journey begins now! This app is for training and does not diagnose or treat any condition. Ask your eye care professional about your vision. Terms of Use - https://www.opticstrainer.com/terms-of-service/ Privacy Policy - https://www.opticstrainer.com/privacy-policy/
King
This app allows remote administration of the King-Devick Test, a sideline concussion screening tool. It's designed for users with an existing King-Devick account and can be used by parents, coaches, trainers, or medical professionals to help identify concussions or monitor neurodegenerative diseases.
- Remote administration of King-Devick Test
- Concussion screening for athletes
- Monitoring neurodegenerative diseases
- Companion app for existing users
- Objective and reliable testing
- Digital Health adaptation
Read full descriptionHide full description
This app is intended as a companion app for users with an existing King-Devick account. The King-Devick Remote App may be used to remotely administer the King-Devick Test in association with Mayo Clinic Concussion Screening Test and other King-Devick products such as King-Devick Pro Monitoring. The King-Devick Test in association with Mayo Clinic 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 in association with Mayo Clinic is an accurate and reliable method to help identify athletes with concussion on the sidelines. Peer reviewed published articles have also shown that King-Devick Test can be an effective tool in monitoring that progression of disease in chronic neurodegenerative diseases such as Parkinson’s disease, Alzheimer’s disease, multiple sclerosis, migraine, Huntington’s disease, hypoxia, age related macular degeneration and other chronic neurodegenerative diseases. With the rapid adaptation of Digital Health the King-Devick Remote App can allow health care providers to administer King-Devick products when the subject/patients are not required to be physically evaluated in person by that health care provider
Screenshots
Verdict
The clearest difference is rating: King at 5.0 against Optics Trainer's 4.5. King also leads on in-app purchases (none vs 3) and ads (none vs shown). Optics Trainer's advantage is update cadence (every 8 days vs every 8 months) and ratings volume (302 vs 1). On price 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. Optics Trainer sells 3 in-app purchases, starting at $4.99 per 7 days. King asks for nothing beyond the download.
King holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Optics Trainer has 302 ratings behind it against 1, so its average is the more settled of the two.
Optics Trainer ships an update every 8 days, King every 8 months. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.
| Parameter | Optics Trainer | King |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (302 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 64.7% of reviews | — |
| Number of ratings | 302 — better | 1 |
| Update frequency | Every 8 days — better | Every 8 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 9.0 — better |
| Further details — not scored | ||
| Size | 476 MB | 119 MB |
| Age rating | 4+ | 4+ |
| Developer | Optics Trainer LLC | King-Devick Test, LLC |
Customer experience
Optics Trainer
King
Bugs and requests
Optics Trainer
Reported bugs
5 issues- Number flip game has blank tiles
- Flower power stopped working
- Letter delivery letter goes off-screen
- Attention exercises stuck on level one
- Ice flow impossible to level up
Requested features
5 requests- Customize peripheral vision symbols
- Option to change symbol colors
- Adjust number of targets in Dynamic Acuity
- Add introductory level for Dynamic Acuity
- Allow offline play in free version
King
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Optics Trainer
- Weekly Subscription$4.997 Days
- Monthly Subscription1 Month trial$14.991 Month
- Annual Subscription1 Month trial$149.991 Year
King
No in-app purchases








