K vs Chart2020 Lite
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
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.
- 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
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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 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
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.
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.
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.
| Parameter | K | Chart2020 Lite |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 14 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPad | iPad |
| Requires iOS | 8.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 57 MB | 58 MB |
| Age rating | 12+ | 4+ |
| Developer | King-Devick Test, LLC | Shemesh Health Solutions PTY Ltd |
Customer experience
K
Chart2020 Lite
In-app purchases
K
No in-app purchases
Chart2020 Lite
- Weekly Subscription3 Days trial$7.997 Days
- Weekly Subscription1 Month trial$7.997 Days
- Monthly Subscription1 Month trial$19.991 Month
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- Yearly Subscription1 Month trial$149.991 Year









