Comparison

Kay Amblyopia Tracker vs Cullen Chart Digital

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

Head to head
About

Kay Amblyopia Tracker

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The Kay Amblyopia Tracker app lets eye professionals offer their patients a way to better understand and collaborate in their amblyopia journey by monitoring vision changes at home between eye test appointments. The app can only be accessed through a qualified eye professional, ensuring that a diagnosis and treatment plan are in place and ongoing. The test is simple and quick to do without any expertise. Once you’ve read the tutorial, just follow the on-screen instructions. The app displays the same letters and familiar pictures seen in a professional vision test, but with a unique testing process that is easy to use at home for children from 24 months of age. Regular home test scores are uploaded to a chart, making it easy to follow the child’s progress and giving useful feedback and encouragement Sharing the child’s progress chart with their eye professional could help to reduce the frequency of clinic appointments, so saving the time and costs. For patients: - Provides a fun, easy way to keep track of changes and improvements in your child’s amblyopia at home. - Gives you and your child a visual chart of their progress to encourage compliance with treatment. - Displays contact details for your child’s eye professional and an email link to them from the Test History Chart. - Tells you when you last tested and can be set to remind you when to test next. For eye professionals: - The app is configured to accurately display letter and picture optotypes that are validated for visual acuity measurement. - However, the scores given are not a visual acuity measurement, so ensuring no comparisons or treatment decisions are taken by the patient. - Access to the app test process is via activation codes provided only to qualified eye professionals and medical personnel. - Regular home testing and monitoring can aid patient understanding and compliance with treatment. - The progress chart can be shared with you, which may, in time, help you to decide on the frequency of follow up appointments. * Reference O’Connor, A., Waters, M., England, L., Milling, A. and Kay, H., 2021. Evaluation of a New Method to Track Changes in Vision at Home for Children Undergoing Amblyopia Treatment. British and Irish Orthoptic Journal, 17(1), pp.70–78. DOI: http://doi.org/10.22599/bioj.172

About

Cullen Chart Digital

Features
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This app is based on a previously validated paper chart (the Cullen chart) and used to assess visual fields. It is intended for use by a trained clinician and has been designed specifically for pituitary and parasellar pathology. The chart tests the central 25 degrees of the visual field. 30 years ago, a paper chart was developed in Edinburgh by Cullen et al. and validated as a swift, supplementary method for perimetric evaluation of visual fields. We have re-developed this concept in digital form (on smartphone screen) and assessed its sensitivity and specificity in detecting visual field loss, by comparison with formal machine-based perimetry. DISCLAIMER: For use by clinicians only. This app does not provide any medical advice. Support & Contact: https://www.eosurgical.com/pages/contact-us Read more about our terms and conditions and privacy policy here - https://www.eosurgical.com/pages/terms-and-conditions

Screenshots

Kay Amblyopia Tracker4 screens
Cullen Chart Digital4 screens

Verdict

The call

The clearest difference is update cadence: Kay Amblyopia Tracker at every 2 months against Cullen Chart Digital's every 5 months. 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Kay Amblyopia Tracker ships an update every 2 months, Cullen Chart Digital every 5 months. The most recent releases landed on October 4, 2026 and October 10, 2026 respectively.

Scorecard1 real difference · 5 level
Kay Amblyopia Tracker versus Cullen Chart Digital: the parameters behind the verdict, then further details
ParameterKay Amblyopia TrackerCullen Chart Digital
PriceFreeFree
Update frequencyEvery 2 months — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPod
Requires iOS14.113.0 — better
Further details — not scored
Size15 MB32 MB
Age rating17+4+
DeveloperKay Pictures LtdMark Hughes

In-app purchases

None

Kay Amblyopia Tracker

No in-app purchases

None

Cullen Chart Digital

No in-app purchases

Questions

Is Kay Amblyopia Tracker free?
Kay Amblyopia Tracker is free to download, with no in-app purchases.
Is Cullen Chart Digital free?
Cullen Chart Digital is free to download, with no in-app purchases.
Do Kay Amblyopia Tracker or Cullen Chart Digital have ads?
Neither Kay Amblyopia Tracker nor Cullen Chart Digital shows ads.
Which is updated more often, Kay Amblyopia Tracker or Cullen Chart Digital?
Kay Amblyopia Tracker ships an update every 2 months, and Cullen Chart Digital every 5 months. Most recently, Kay Amblyopia Tracker was updated on October 4, 2026 and Cullen Chart Digital on October 10, 2026.

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