Smart Optometry vs OKN Drum
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Smart Optometry
This app offers eye care professionals a suite of 15 interactive and precise digital eye exams for patient screening and testing. It simplifies the examination process with clear guidelines, fast execution, and automated calculations, supporting a more efficient and accurate diagnostic workflow.
- 15 interactive digital eye exams
- Automated calculation and diagnosis
- Multi-language support
- Vertex and visual acuity calculators
- Simple and fast user interface
- Precise and reliable results
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Smart Optometry is #1 choice for eye care professionals around the world! Give your patients’ best care with 15 FREE INTERACTIVE, PRECISE and SIMPLE eye exams in 9 languages. Join 100.000+ eye care specialists using Smart Optometry for eye examinations! Why should your customers undergo the same tests they always go through when they have their eyes tested? Why should this advanced industry stick with old and outdated practices? Smart Optometry includes 15 TESTS are available for FREE: – Colour Vision – Contrast – Visual Acuity – Worth Four Dot – Schober – OKN Stripes – Flourescin Light – Red Desaturation – Hirschberg – Accommodation – Duochrome – Aniseikonia – Amsler Grid – MEM Retinoscopy – Visual Acuity + To help you make your work simpler, we also included 2 CALCULATORS: – Vertex Conversion – Visual Acuity Conversion Because we know language barrier can be a problem, we localised our application to 11 LANGUAGES: English, Spanish, German, French, Russian, Italian, Polish, Norwegian, Czech, Croatian and Slovenian! Want your language added? Let us know at: info@smart-optometry.com. Still not convinced? Read what sets us apart! Our solution is SIMPLE to use! Eye screening and testing shouldn’t be difficult and inconvenient for neither practitioner or customer! Smart Optometry application is very simple to use: just select the test, read through short guidelines for performing the test, execute it and let our application give you the basic diagnosis – final result or point you in the direction of possible problems that need more thorough examinations! Tests are FAST! While you are filling out paperwork for a patient, he or she can already test his or her eyesight with basic tests provided by Smart Optometry application. There is no logistics involved in performing the tests: just pick up your iPad and test-away! Results provided are PRECISE and reliable! Eye testing and screening often requires eye-care professionals to make calculations – giving the room for error. Eliminate this risk with precise calculations and interpretations done by our Smart Optometry application. Our tests are as precise if not more than the currently used on-the-wall testing equipment. All tests are INTERACTIVE and fun! Wouldn’t it be easier to let patients do the things you ask them, rather than try to explain what they see to you? Smart Optometry application is uniquely interactive: user presses buttons, draws on the screen and this way provides precise results – while having fun! Interactive handling with the Smart Optometry application also enables it to give you result interpretations.
OKN Drum
This app offers a digital optokinetic drum for vision testing and exercises. Customize stripe width, speed, and color, with options for pediatric targets. It also features a metronome and camera recording for eye movements.
- Adjustable stripe width and speed
- Selectable black or red stripes
- Pediatric targets (puppies, dinosaurs, animals)
- Full-screen mode
- Integrated metronome
- Record eye movements with camera
- Upload custom images for drum
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IN-APP PURCHASE REQUIRED FOR USE · OKN Drum Pro provides an Optokinetic Nystagmus (OKN) Drum featuring multiple modes for optokinetic testing and exercises. Users can adjust the stripe width to their preference using the pinch-to-zoom functionality. · The speed of the OKN stripes is easily adjustable, enabling quick increases or decreases as desired. · Users have the option to select either black or red stripes to suit their visual requirements. · Includes multiple pediatric targets, such as puppies, dinosaurs, and various animal targets. · By tapping the stripes, users can enter full-screen mode for an immersive experience. · A metronome is also available to assist with timing exercises, enhancing the overall utility of the app for therapeutic and testing purposes. · Record eye movements with the front facing camera · Upload images for a custom OKN drum · Flick the OKN graphic to simulate rotating an OKN drum This app is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or a qualified healthcare provider before making any medical decisions. If you think you may have a medical emergency, call emergency services immediately.
Screenshots
Verdict
The clearest difference is update cadence: OKN Drum at every 9 days against Smart Optometry's every 4 months. Smart Optometry's advantage is rating (4.4 vs 4.1) and ratings volume (529 vs 16). On price, review sentiment, ads and in-app purchases 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. Smart Optometry sells 10 in-app purchases, starting at $2.99 per month and OKN Drum sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Smart Optometry holds the better App Store score, 4.4 against 4.1. That said, the two scores are not equally well evidenced: Smart Optometry has 529 ratings behind it against 16, so its average is the more settled of the two. Written reviews complicate that: 42% of Smart Optometry's written reviews are positive against 46% of OKN Drum's, so the app with the better star average is not the one people write more warmly about.
Smart Optometry ships an update every 4 months, OKN Drum every 9 days. The most recent releases landed on September 20, 2026 and September 22, 2026 respectively.
| Parameter | Smart Optometry | OKN Drum |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (529 ratings) — better | 4.1 (16 ratings) |
| Positive reviews | 42.3% of reviews | 46.2% of reviews — better |
| Number of ratings | 529 — better | 16 |
| Update frequency | Every 4 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13 — better | 17.0 |
| Further details — not scored | ||
| Size | 28 MB | 13 MB |
| Age rating | 12+ | 4+ |
| Developer | Hundred Vision d.o.o. | My Call Bag LLC |
Customer experience
Smart Optometry
OKN Drum
Bugs and requests
Smart Optometry
Reported bugs
5 issues- App crashes on startup
- App closes automatically after login
- App stops working after update
- Tests demand payment for Pro version
- Visual acuity unit converter plus button not working
Requested features
5 requests- Update visual acuity unit converter plus button
- Add inches option for measurement
- Provide explanations for test procedures and expected results
- Make Arabic language available
- Allow calibration of acuity test for different distances
OKN Drum
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Smart Optometry
- PRO Monthly Subscription$2.991 Month
- PRO Yearly Subscription$22.991 Year
- Visual Acuity + Test$1.99
- Red Desaturation Test$1.99
- Generous Tip$4.99
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- Generous Tip!$4.99
- Smart Optometry PRO$9.99
- PRO Bundle$9.99
- Massive Tip!$9.99
- Amazing Tip!$14.99
OKN Drum
- Lifetime Access$4.99
Questions
Is Smart Optometry free?
Is OKN Drum free?
Which has better reviews, Smart Optometry or OKN Drum?
Do Smart Optometry or OKN Drum have ads?
Which is updated more often, Smart Optometry or OKN Drum?
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