Comparison

Eye Chart Pro vs i

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

Head to head
About

Eye Chart Pro

This app provides a randomized visual acuity exam, functioning like a projector-based eye chart. It's useful for quick vision screenings, house visits, or when patients may have memorized standard charts. The app offers both Snellen and Tumbling E charts with randomization options.

Highlights
  • Randomizable Snellen Chart
  • Randomizable Tumbling E Chart
  • Randomize entire chart or line by line
  • Smooth interface with animations
  • Basic remote control
  • Metric / Feet functionality
Features
Read full description

**A Top Downloaded Medical App - Over 500,000 Installs** Eye Chart Pro is a clinically-reviewed, randomizable visual acuity exam. It’s remote-controlled, pleasant for patients and providers, and FREE. Similar chart projector functionality usually costs over $1000. Check out the last screenshot to see more information on the clinical reviews in peer-reviewed publications and their conclusions. Useful for: - Triaging - House visits - Patients who have memorized the office chart Features: - Randomizable Snellen Chart - Randomizable Tumbling E Chart - Randomize the whole chart or one line at a time - Smooth interface with animations - Basic remote - Metric / Feet functionality Description: Eye Chart Pro is a generator for randomized Snellen and Tumbling E charts to offer a rough but useful screen of visual acuity. Simply press a button to randomize the entire eye chart, or touch an individual line of the chart to randomize that line. Tap another button to toggle between Snellen and Tumbling E charts. Eye care professionals around the world use Snellen Eye Charts to measure visual acuity. However, patients often memorize the classic Snellen chart, leading to less accurate vision measurements. Enter Eye Chart Pro! Though this unique, notebook sized randomizable eye chart should not be used as a primary visual acuity measuring tool, it can provide a handy rough vision screen when a chart is not available, or it can be used to complement static, wall-based Snellen charts. Eye Chart Pro was made with the best of intentions, and we hope to continue improving it. Your feedback is appreciated! Here is a summary of clinical evaluations we have found: ETDRS Chart on Eye Chart Pro on iPad: “Validation of the visual acuity iPad app Eye Chart Pro compared to the standard Early Treatment Diabetic Retinopathy Study chart in a low-vision population” Journal of Telemedicine and Telecare. Conclusion (summary quote): “The ETDRS chart function on the Eye Chart Pro application can reliably measure VA across a range, from normally sighted patients to those with low vision.” Sloan Chart on Eye Chart Pro on iPad: “The validity of visual acuity assessment using mobile technology devices in the primary care setting.” Australian Family Physician. Conclusion (summary quote): “The high level of agreement of visual acuity results between the Snellen wall chart and both mobile technology devices suggests that clinicians can use this technology with confidence in the primary care setting.” Tumbling E Chart on Eye Chart Pro on iPad: “A Pilot Trial of the Ipad Tablet Computer as a Portable Device for Visual Acuity Testing” Journal of Telemedicine and Telecare. Conclusion (summary quote): “Bland-Altman analysis revealed a mean difference (bias) of 0.02 logMAR units between the VA results from the iPad chart and the light-box chart, with 95% limits of agreement of -0.14 to 0.19.” We are not responsible for the above studies, so please check out the papers above if you have further questions.

About

i

Features
Read full description

Medical reminder: Our hardwares have obtained medical certificates issued by CFDA and FDA, that is, the hardware that interacts with this app has received regulatory clearance from China and US. CV-7800 Auto Phoropter @i-Optik is a complete optometry examination solution for your office workflow, which is kept safety with customers. 1.Powerful and simple operation interface. 2.Lens switch fast and smoothly, provide more comfortable optometry experience. 3.Built-in client files management function, easy to retrieve client file. 4.Support data transmission with external devices such as Auto refractometer/Chart Monitor etc. Contact us at webmaster@nbmingsing.com

Verdict

The call

The clearest difference is in-app purchases: i at none against Eye Chart Pro's 11. i also leads on update cadence (every 5 weeks vs every 3 months). On price, ads, device support and iOS requirement 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. Eye Chart Pro sells 11 one-off in-app purchases. i asks for nothing beyond the download.

UpkeepUpdate frequency

Eye Chart Pro ships an update every 3 months, i every 5 weeks. The most recent releases landed on July 27, 2026 and September 18, 2026 respectively.

Scorecard2 real differences · 8 level
Eye Chart Pro versus i: the parameters behind the verdict, then further details
ParameterEye Chart Proi
PriceFreeFree
Rating4.0 (2 ratings) — better—
Positive reviews53.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 3 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPadiPad
Requires iOS12.012.0
Further details — not scored
Size29 MB166 MB
Age rating4+12+
DeveloperManu Lakkur宁波明星科技发展有限公司

In-app purchases

11 purchases

Eye Chart Pro

One-time11
  • Amsler Grid in Portrait and Landscape.$9.99
  • Premium Home Edition of Eye Chart Pro$19.99
  • HOTV Chart$19.99
Show 8 more
  • Sloan Letters Chart$19.99
  • ETDRS Chart 1$39.99
  • Professional Version with ALL Features$39.99
  • Advanced Remote Control$39.99
  • All Charts$39.99
  • Sloan Duochrome Chart$39.99
  • Value Pack$59.99
  • Professional Package$199.99
None

i

No in-app purchases

Questions

Is Eye Chart Pro free?
Eye Chart Pro is free to download, with in-app purchases available.
Is i free?
i is free to download, with no in-app purchases.
Do Eye Chart Pro or i have ads?
Neither Eye Chart Pro nor i shows ads.
Which is updated more often, Eye Chart Pro or i?
Eye Chart Pro ships an update every 3 months, and i every 5 weeks. Most recently, Eye Chart Pro was updated on July 27, 2026 and i on September 18, 2026.

Other comparisons