LessonPad vs K
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LessonPad
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The best tool available to explain or analyze sports video recordings. LessonPad is an application for analyzing sports, and other activities, videos. (Like other expensive and exclusive software) It's an easy and simple way to analyze videos of your forms and training sessions. You can easily use it after recording or pick up your video stored in iPad. Easy Instruction video : http://NewtonJapan.com/LessonPad ■Videos You can choose video from camera roll or from video app. Recording feature also available. You can record videos and use them instantly. There's useful Grids on a recoding screen to measure camera angle. ■Compare two videos You can choose two videos to compare with. - Two players movement. - Today's video and yesterday's. Compare them side-by-side position or Layered view. Playback them together in slow motion, then you must find some good technics behind them. ■Slow motion Video can be played in slow motion. Using thumb-track bar, you can change playback speed precisely, and play slow forward and slow backward as you like. ■Movement analysis The markings can be drawn on the screen while the video plays in slow motion, or while playing step by step. This option can be used to easily point out ideal forms or movement. You can draw straight lines using two fingers in order to find out the axis of your body movement. ■Thumbnails Any video can be divided into thumbnails. You can choose one of them to jump to that point of the video. ■Pens A choice of seven different line colors at the bottom of the screen. Eraser also available. 3 line thicknesses are available to choose from. Just touch current pen to change thickness. All marks can be erased by tapping on the trash can icon. ■Screen snap shot After marking the video, a still picture can be taken of the final result. The marked-up picture can be saved as new item in camera roll on iPad. You can send it by email. To take marked-up picture, press home button and power button at the same time (iPad's original function). ■TV Output The iPad originally has functionality to output its display to TV screen (iPad2 or later). So you can share your drawing with your team or friend using huge screen while meetings. You need a cable to connect your iPad to a TV or a Projector.
K
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This is a score calculator for WKF Karate Kata matches that supports not only the new rule but also the old rule. (the new rules are only for 5-judge, 7-judge not supported). From Ver. 2.0, it has been modified to be able to calculate not only individual scores but also rankings. Even in cases where the highest and lowest scores are cut off and the scores are tied, the ranking can be made according to the rules.
Screenshots
Verdict
The clearest difference is price: K at Free against LessonPad's $15.99. K also leads on iOS requirement (14.0 vs 17.6). LessonPad's advantage is update cadence (every 6 weeks vs every 5 months). On ads, in-app purchases 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
K is free to download; LessonPad costs $15.99 up front. Neither carries in-app purchases, so what you see is what you pay.
LessonPad ships an update every 6 weeks, K every 5 months. The most recent releases landed on September 21, 2026 and May 16, 2026 respectively.
| Parameter | LessonPad | K |
|---|---|---|
| Price | $15.99 | Free — better |
| Update frequency | Every 6 weeks — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 22 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Newton Japan Inc. | SHIGERU OKADA |
In-app purchases
LessonPad
No in-app purchases
K
No in-app purchases









