Comparison

Eye Handbook vs 9 Gaze

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

Head to head
About

Eye Handbook

A comprehensive eye care reference app for ophthalmologists, optometrists, and students. It offers diagnostic tools, treatment references, calculators, educational resources, and community forums to support eye care professionals.

Highlights
  • Diagnostic and treatment reference
  • Eye calculators (visual acuity, diabetic retinopathy, etc.)
  • Medication and pharmacopeia
  • Ophthalmology and optometry journals
  • Patient education tools
  • Peer-to-peer forums
  • Eye atlas and diagrams
Features
Read full description

Eye Handbook (EHB) is an eye care reference book and an all-in-one app for Ophthalmologists, Optometrists as well as Students/Residents pursuing the field of eye care. The Eye Handbook is a smartphone diagnostic and treatment reference app for Ophthalmologists and Optometrists. Below is a list of some of the common features. -Eye Calculators -Transposition Calculator -Visual Acuity Calculator -Age to bifocal -Diabetic Retinopathy Severity Calculator -Dry Eye Disease Calculator -Glaucoma Risk Calculator -Thyroid Eye Disease Calculator -Retinoblastoma Calculator -EHB Indirect Camera -Ocular Trauma Score -Plaquenil Dosing -IOP-CCT -Pupillary Distance -DDX -Testing -ICD9 coding -ICD9 to ICD10 converter -ICD10 coding -Audio, Video downloads -Directory -Eye Atlas -Eye Wiki -Peer-to-peer Forums -Connecting with patients -Ophthalmology and Optometry Journals -Medication and Pharmacopeia -Journals -Eye Diagrams -Patient Education tools -RSS Feeds -Acronym List -Dictionary -Eponyms -Genetics -Mnemonics -Workups -Treatment Reference -Vision Symptoms Cards If you have content that you would like to contribute; please contact us at eyehandbook@gmail.com. Please feel free to contact us with any questions you may have. We are constantly striving to improve this application and welcome your feedback. www.eyehandbook.com The Eye Handbook Team

About

9 Gaze

This app helps document eye motility and strabismus in nine cardinal positions. It offers an on-screen guide for consistent eye positioning and automatically creates composite images for easy exporting. Users can add strabismus measurements and email or save images for medical records.

Highlights
  • Document eye motility and strabismus
  • On-screen guide for eye positioning
  • Automatic composite image creation
  • Add strabismus measurements
  • Selfie or standard mode
  • Email or save images
Features
Read full description

9 Gaze is an easy, quick, and efficient way to document eye motility and strabismus in the nine cardinal positions of gaze (and 2 head tilts, abnormal head position). The app provides an on-screen guide for eye positioning to assist with image consistency through all photographs. 9Gaze app automatically creates a composite image of the photographs for easy exporting. Designed for a touch-screen interface, you can also quickly add strabismus measurements to your photograph or as a stand-alone image. You can email the images to yourself for importing into your record or save to your camera roll. Features: - Selfie mode or standard mode - On-screen guide for placement of eyes (with autocrop) - Automatic creation of the composite image of all 9(+2) positions of gaze - Ability to skip gaze directions (or skip to end) - Re-take any picture - Turn flash on or off - Landscape and portrait modes - Ability to document name, ID number, date of birth, and date of picture Save time with 9 Gaze! Disclaimer: No information or photos are ever saved within the app. It is the user's responsibility to protect any and all protected health information (PHI) obtained by the user. If you choose to save images to camera roll, it is highly suggested to encrypt your phone and turn off iCloud photo backup. When emailing photos, please make sure your email is HIPAA secure. This is not a medical device. Do not use app to diagnose or treat any medical conditions.

Screenshots

Eye Handbook4 screens
9 Gaze4 screens

Verdict

The call

The clearest difference is ads: 9 Gaze at none against Eye Handbook's shown. 9 Gaze also leads on monetization model (free vs ad-supported) and iOS requirement (13.0 vs 16.0). Eye Handbook's advantage is ratings volume (1.2K vs 22) and rating (4.8 vs 4.6). On price, review sentiment, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Eye Handbook holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Eye Handbook has 1.2K ratings behind it against 22, so its average is the more settled of the two. Written reviews complicate that: 82% of Eye Handbook's written reviews are positive against 86% of 9 Gaze's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Eye Handbook ships an update every 3 weeks, 9 Gaze every 2 months. Both last shipped on November 6, 2026.

Scorecard6 real differences · 4 level
Eye Handbook versus 9 Gaze: the parameters behind the verdict, then further details
ParameterEye Handbook9 Gaze
PriceFreeFree
Rating4.8 (1.2K ratings) — better4.6 (22 ratings)
Positive reviews82.2% of reviews85.7% of reviews — better
Number of ratings1.2K — better22
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.013.0 — better
Further details — not scored
Size480 MB36 MB
Age rating17+12+
DeveloperCloud Nine Development LLCSee Vision, LLC

Customer experience

Eye Handbook

All ratings1,157 ratings
Positive95.8%
Neutral1.3%
Negative2.9%
Written reviews163 reviews
Positive82.2%
Neutral5.5%
Negative12.3%

9 Gaze

All ratings22 ratings
Positive90.9%
Neutral0.0%
Negative9.1%
Written reviews14 reviews
Positive85.7%
Neutral0.0%
Negative14.3%

Bugs and requests

Eye Handbook

Reported bugs

3 issues
  • Registration process issues
  • Compatibility problems with newer iOS versions
  • Incorrect medication information

Requested features

4 requests
  • Add Tumbling E and Landolt C charts
  • Improve search functionality
  • Provide a paid ad-free version
  • Optimize for larger screens (iPad)

9 Gaze

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Eye Handbook

No in-app purchases

None

9 Gaze

No in-app purchases

Questions

Is Eye Handbook free?
Eye Handbook is free to download, with no in-app purchases.
Is 9 Gaze free?
9 Gaze is free to download, with no in-app purchases.
Which has better reviews, Eye Handbook or 9 Gaze?
Eye Handbook is rated higher. Eye Handbook averages 4.8 out of 5 from 1.2K ratings, while 9 Gaze averages 4.6 from 22 ratings.
Do Eye Handbook or 9 Gaze have ads?
Eye Handbook shows ads; 9 Gaze does not.
Which is updated more often, Eye Handbook or 9 Gaze?
Eye Handbook ships an update every 3 weeks, and 9 Gaze every 2 months. Most recently, Eye Handbook was updated on November 6, 2026 and 9 Gaze on November 6, 2026.

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