Comparison

K vs Chart2020 Lite

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

Head to head
About

K

This application facilitates the administration of a rapid eye movement test for reading assessment. It compares performance against age-related norms for individuals aged 6-14+, helping to identify potential candidates for reading intervention programs.

Highlights
  • Reads numbers from test cards
  • Measures speed and accuracy
  • Compares results to age norms
  • Identifies candidates for intervention
  • Administered in under two minutes
  • Validated by peer-reviewed studies
Features
Read full description

The King-Devick Test involves reading aloud a series of single digit numbers from left to right on three test cards. Performance is based on speed and accuracy and results are instantly compared to age-related normative data for subjects 6-14+ years old. Testing administrators can quickly identify subjects that may be prime candidates for the King-Devick Reading Acceleration Program as an effective intervention. -Reliable: K-D Test has been extensively researched and validated by peer-reviewed studies -Quick: K-D Test Pro Reading can be easily administered in two minutes or less -Objective: Performance immediately compared to age-related normative data for subjects 6-14+ years old This app is intended ONLY for professional users with an existing K-D Test Pro Reading account.

About

Chart2020 Lite

This app provides a digital eye chart with various testing options, including different chart types and masking features. It offers remote control capabilities via a companion iPhone app or an optional Bluetooth remote, making it suitable for professional and home use.

Highlights
  • Multiple chart types (Sloan/Snellen, Balancing, Astigmatism)
  • Customizable testing distance
  • Variety of letter/number/symbol sets
  • Masking and randomization options
  • Companion iPhone app for remote control
  • Optional Bluetooth remote control
Features
Read full description

Chart Types * Sloan / Snellen Charts * Balancing Charts * Astigmatism Charts Chart Features * Set exact testing testing distance * Quickly switch to near distance testing with distance selector * Letters, Numbers, Kids, E, C, HOTV, 6 Global Fonts * 4 Masking options * Randomize letter set Controllers * Control direct on the iPad * Use the companion iPhone app * See the displayed letters on the iPhone (no neck turning) * Control every feature from the iPhone * Order the Bluetooth Remote Control to control with a 6 button controller Uses * Ophthalmologist and Optometrists * Completely mobile for school testing * Emergency Room * Functional Evaluation Capacity for Companies * Home Use * Students The Chart2020 iPad App comes with a 30 day free trial. After this period you may purchase an auto-renewing subscription through an In-App Purchase. (If you do not maintain a subscription you can only use the App for thirty days and then it will expire) • Auto-renewable subscription • 1 month ($29.99) / 1 Year ($199.99) • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase. http://chart2020.com/privacy-policy https://www.chart2020.com/terms-of-use

Verdict

The call

The clearest difference is rating: K at 5.0 against Chart2020 Lite's 1.0. K also leads on in-app purchases (none vs 4) and iOS requirement (8.0 vs 12.0). Chart2020 Lite's advantage is update cadence (every 3 months vs every 14 months). On price, ratings volume, ads 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. Chart2020 Lite sells 4 in-app purchases, starting at $7.99 per 7 days. K asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

K holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

K ships an update every 14 months, Chart2020 Lite every 3 months. The most recent releases landed on September 30, 2026 and October 14, 2026 respectively.

Scorecard5 real differences · 5 level
K versus Chart2020 Lite: the parameters behind the verdict, then further details
ParameterKChart2020 Lite
PriceFreeFree
Rating5.0 (1 ratings) — better1.0 (1 ratings)
Positive reviews—0.0% of reviews
Number of ratings11
Update frequencyEvery 14 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPadiPad
Requires iOS8.0 — better12.0
Further details — not scored
Size57 MB58 MB
Age rating12+4+
DeveloperKing-Devick Test, LLCShemesh Health Solutions PTY Ltd

Customer experience

K

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Chart2020 Lite

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

K

No in-app purchases

4 purchases

Chart2020 Lite

Subscriptions4
  • Weekly Subscription3 Days trial$7.997 Days
  • Weekly Subscription1 Month trial$7.997 Days
  • Monthly Subscription1 Month trial$19.991 Month
Show 1 more
  • Yearly Subscription1 Month trial$149.991 Year

Questions

Is K free?
K is free to download, with no in-app purchases.
Is Chart2020 Lite free?
Chart2020 Lite is free to download, with in-app purchases available.
Which has better reviews, K or Chart2020 Lite?
K is rated higher. K averages 5.0 out of 5 from 1 ratings, while Chart2020 Lite averages 1.0 from 1 ratings.
Do K or Chart2020 Lite have ads?
Neither K nor Chart2020 Lite shows ads.
Which is updated more often, K or Chart2020 Lite?
K ships an update every 14 months, and Chart2020 Lite every 3 months. Most recently, K was updated on September 30, 2026 and Chart2020 Lite on October 14, 2026.

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