Comparison

Eye Chart HD vs MobilEM

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

Head to head
About

Eye Chart HD

This app provides a clinically evaluated visual acuity screening tool for various settings. It offers randomized Snellen, Tumbling E, and other charts to help assess vision, especially when traditional charts are unavailable or memorized. Additional features are available through a monthly subscription.

Highlights
  • Randomized Snellen charts
  • Tumbling E charts
  • Pocket vision screener
  • Line randomization
  • Chart selector
  • Near vision chart (subscription)
  • Amsler Grid (subscription)
Read full description

Easy to use, clinically evaluated visual acuity screening app. Over 1M people have downloaded our mobile electronic eye charts for iOS. Read below for more information on the clinical evaluations. Useful for: - Triaging - House visits - Hospital rounds - Emergency rooms - Schools - Patients who have memorized the office chart Eye Chart HD is a pocket vision screener: randomized Snellen, Tumbling E, and other 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. Swipe right for the chart selector. 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 HD! Though this unique, pocket-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. Subscription: In addition to our free features, Eye Chart HD offers a subscription to exclusive paid features, including the Randomizable Near Vision Chart, Line Isolation, Amsler Grid, and Single Optotype Charts! The subscription costs $2.99 per month of access and has to be purchased specially within the app. Once purchased, it is available through an auto-renewing subscription which will renew each month for your convenience until you choose to turn it off. Please let us know if you have any questions about your subscription at eyechartapp@gmail.com. Below is further information on clinical evaluations that have been done. Please do check out the papers cited below if you have concerns. We didn't do these tests and can't speak to them, but we are providing them here for transparency and your reference:  Snellen & Tumbling E charts on Eye Chart HD on iPhone: “Comparison of Visual Acuity Measurement Using Three Methods: Standard ETDRS Chart, Near Chart and a Smartphone-Based Eye Chart Application” Clinical Ophthalmology. Conclusion: “VA measurements with the Near Chart and smartphone-based Eye Chart application corresponded well to the standard ETDRS chart, suggesting potential utility of alternative portable VA tests for in-office or remote vision monitoring, particularly during periods of physical distancing such as the Coronavirus disease 2019 (COVID-19) era” Sloan Chart on Eye Chart HD on iPhone: “Does the EyeChart App for iPhones Give Comparable Measurements to Traditional Visual Acuity Charts?” The British and Irish Orthoptic Journal. Conclusion: “This study found that the VA scores achieved on the EyeChart app are comparable to those achieved using the gold-standard ETDRS chart in a healthy young adult population. This is a promising finding; however, it is necessary for further large-scale studies to investigate the EyeChart app when used on a variety of patient population groups.” Snellen Chart on Eye Chart HD on iPad Mini: “Comparative Study of the Snellen iPad App versus Traditional Light Box Snellen Chart in Distance Visual Acuity” International Journal of Ophthalmology and Clinical Research. Conclusion: “It showed that the results from Eye Chart HD app used in an iPad Mini 2 agreed with the results of the traditional light-box Snellen Chart when used at the Outpatient Department.“ Rapid Vision Screening Chart on Eye Chart HD on iPhone/iPod: “Assessment of a rapid method to determine approximate visual acuity in large surveys and other such settings.” American Journal of Ophthalmology. Conclusion: “An iPod application requiring about a 1-minute testing time provides an objective, portable, rapid, and low-cost method to determine approximate VA, allowing VA testing to be performed efficiently in large surveys and other settings where approximate VA should be measured.”

About

MobilEM

Provides fast, evidence-based clinical guidance for emergency medicine professionals. Access updated recommendations on a wide range of topics, including antibiotics, toxicology, and critical care. Offers free content, individual purchases, and an all-access subscription.

Highlights
  • Evidence-based recommendations
  • Antibiotic and toxicology guidance
  • EKG and orthopedic injury protocols
  • Airway and pediatric emergency management
  • Critical care medication information
  • Fast navigation and universal search
  • Bookmarking and note-taking
Features
Currently charting
Read full description

One of our greatest privileges at EMRA is offering resources that can help make every clinical shift easier, through evidence-based guidance in your pocket. Get updated recommendations for antibiotics, toxicology, EKGs, orthopedic injuries, airway management, pediatric emergencies, splinting, critical care medications, and more. Enjoy free content, purchase our resources a la carte, or subscribe to our all-access pass (best value!) to take full advantage of these key features: • Fast, easy navigation • Powerful universal search • Bookmarking • Note-taking fields • Continual updates that require no action on your part We hope you find MobilEM to be useful; check back often, as we will be adding new content on a regular basis. Please note: EMRA is committed to your privacy. See our policy at https://www.emra.org/about-emra/privacy-policy/. Terms of Use: This and all other digital reference content, including all content offered under subscription is intended for a single user on devices belonging to that user. Use of this app running on a common device shared by an organization is disallowed. For further information on terms of use and EULA please see: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ This app is intended for the US healthcare market.

Screenshots

Eye Chart HD4 screens
MobilEM4 screens

Verdict

The call

The clearest difference is rating: Eye Chart HD at 5.0 against MobilEM's 3.6. Eye Chart HD also leads on iOS requirement (12.0 vs 15.0). MobilEM's advantage is ads (none vs shown) and update cadence (every 2 months vs every 6 months). On price, in-app purchases, monetization model 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. Eye Chart HD sells 2 in-app purchases, starting at $2.99 per month and MobilEM sells 12 in-app purchases, starting at $1.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Eye Chart HD holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: MobilEM has 39 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 34% of Eye Chart HD's written reviews are positive against 45% of MobilEM's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Eye Chart HD ships an update every 6 months, MobilEM every 2 months. Both last shipped on September 29, 2026.

Scorecard7 real differences · 4 level
Eye Chart HD versus MobilEM: the parameters behind the verdict, then further details
ParameterEye Chart HDMobilEM
PriceFreeFree
Rating5.0 (5 ratings) — better3.6 (39 ratings)
Positive reviews34.5% of reviews45.0% of reviews — better
Number of ratings539 — better
Update frequencyEvery 6 monthsEvery 2 months — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank—#40 — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS12.0 — better15.0
Further details — not scored
Size31 MB205 MB
Age rating4+17+
DeveloperDok LLCEmergency Medicine Residents' Association

Customer experience

Eye Chart HD

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews29 reviews
Positive34.5%
Neutral10.3%
Negative55.2%

MobilEM

All ratings39 ratings
Positive61.5%
Neutral10.3%
Negative28.2%
Written reviews20 reviews
Positive45.0%
Neutral15.0%
Negative40.0%

In-app purchases

2 purchases

Eye Chart HD

Subscriptions1
  • Professional Subscription$2.991 Month
One-time1
  • Eye Chart HD Full Version$0.99
12 purchases

MobilEM

Subscriptions12
  • Ventilator Mgmt. Subscription$1.991 Year
  • Pediatric Qwic$1.991 Year
  • MobilEm Airway Management$4.991 Year
Show 9 more
  • Trauma Guide$4.991 Year
  • Antibiotic Guide Subscription$9.991 Year
  • MobilEm Ortho Guide$9.991 Year
  • MobilEM Tox Guide$9.991 Year
  • PressorDex$9.991 Year
  • EKG Guide Subscription$9.991 Year
  • Pain Management$9.991 Year
  • PEM Fundamentals Subscription$9.991 Year
  • MobilEm All Access Pass1 Month trial$39.991 Year

Questions

Is Eye Chart HD free?
Eye Chart HD is free to download, with in-app purchases available.
Is MobilEM free?
MobilEM is free to download, with in-app purchases available.
Which has better reviews, Eye Chart HD or MobilEM?
Eye Chart HD is rated higher. Eye Chart HD averages 5.0 out of 5 from 5 ratings, while MobilEM averages 3.6 from 39 ratings.
Do Eye Chart HD or MobilEM have ads?
Eye Chart HD shows ads; MobilEM does not.
Which is updated more often, Eye Chart HD or MobilEM?
Eye Chart HD ships an update every 6 months, and MobilEM every 2 months. Most recently, Eye Chart HD was updated on September 29, 2026 and MobilEM on September 29, 2026.

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