K vs JSKA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
JSKA
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Our mobile app provides convenient access to the JSKA Passport, the official certificate that serves as proof of membership and technical status recognized by the Japan Shotokan Karate Association's headquarters.
Screenshots
Verdict
The clearest difference is update cadence: JSKA at every 6 weeks against K's every 5 months. On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
K ships an update every 5 months, JSKA every 6 weeks. The most recent releases landed on May 16, 2026 and September 18, 2026 respectively.
| Parameter | K | JSKA |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | SHIGERU OKADA | MVM INFOTECH COMPANY LIMITED |
In-app purchases
K
No in-app purchases
JSKA
No in-app purchases
