VisionC (ETDRS Visual Acuity) vs Keraring Planner
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VisionC (ETDRS Visual Acuity)
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VisionC is the first ETDRS chart completely configurable to be presented at any distance from 20 cm to 400 cm (1 cm step) and for any Contrast from 0 to 100% (1% step). It is the only one that allows you to control de luminance of the background and the optotype with a low-cost external luminance meter. You can use PicoDisplay App and Pico (Palette) device for this purpose. The visual acuity with the ETDRS is usually measured at three distances (far, intermediate and near) but research studies sometimes differ in the specific distance for each one of the categories. With VisionC you can select the specific distance for each one of these three configurations in such a way you can rapidly access to the specific distance you desire. The App comes with a different set of letters in order to avoid memorization. Therefore either letters for distance, intermediate and near or right, left and both eyes differ to prevent memorization. You can join our community in order to ask any question or to receive support: www.facebook.com/groups/qvisionacademy/
Keraring Planner
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Keraring Planner is an advanced tool designed to streamline the surgical planning process for Keraring procedures and enhance communication between surgeons and Mediphacos. This user-friendly app offers comprehensive features to support surgeons in planning and executing Keraring surgeries with precision and efficiency.
Screenshots
Verdict
The clearest difference is price: Keraring Planner at Free against VisionC (ETDRS Visual Acuity)'s $79.99. Keraring Planner also leads on update cadence (every 5 weeks vs every 8 months) and device support (3 vs 1). VisionC (ETDRS Visual Acuity)'s advantage is iOS requirement (10.0 vs 13.0). On 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
Keraring Planner is free to download; VisionC (ETDRS Visual Acuity) costs $79.99 up front. Neither carries in-app purchases, so what you see is what you pay.
VisionC (ETDRS Visual Acuity) ships an update every 8 months, Keraring Planner every 5 weeks. The most recent releases landed on September 26, 2026 and October 10, 2026 respectively.
| Parameter | VisionC (ETDRS Visual Acuity) | Keraring Planner |
|---|---|---|
| Price | $79.99 | Free — better |
| Update frequency | Every 8 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 10.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 9 MB | 30 MB |
| Age rating | 4+ | 17+ |
| Developer | Qvision, Departamento de Oftalmología | Claudio Curi |
In-app purchases
VisionC (ETDRS Visual Acuity)
No in-app purchases
Keraring Planner
No in-app purchases
Questions
Is VisionC (ETDRS Visual Acuity) free?
Is Keraring Planner free?
Do VisionC (ETDRS Visual Acuity) or Keraring Planner have ads?
Which is updated more often, VisionC (ETDRS Visual Acuity) or Keraring Planner?
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