山形工房 けん玉 大空 OZORA KENDAMA vs STEM Line Builder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
山形工房 けん玉 大空 OZORA KENDAMA
This official app from Yamagata Koubou provides resources for learning and mastering kendama. It features tutorials, skill level guides, event information, and a video channel to help users improve their techniques. Members can also access coupons for the online shop.
- Kendama basic explanations
- Trick tutorial videos
- Skill level guides
- Event information
- Video channel
- Member coupons
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山形県長井市で競技用けん玉 大空を製造・販売している山形工房の公式アプリです。 It is the official application of Yamagata Koubou, which manufactures and sells OZORA KENDAMA for competition. 【アプリの機能】 ・新着情報(NEWS) ・けん玉の基本解説(BASIC DESCRIPTION) ・技の解説動画(HOW TO) ・認定表(LEVEL SKILL) （各レベル毎に動画を見ながら練習ができます） ・イベント情報(EVENT) ・動画チャンネル(MOVIE) ・クーポン(COUPON) （会員登録頂くとオンラインショップで使えるクーポンを差し上げます） ・会員登録(MEMBER REGISTRATION) ・友達紹介(INTRODUCE FRIENDS) がご利用頂けます
STEM Line Builder
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STEM Line Builder helps you design "lines" (routines) for longboard dancing. Upload a carving video filmed head-on and the AI reads your posture to draw your board's trajectory as a top-down map. Then just tap a carve on the path and place a step you've learned -- only steps that fit the carves before and after are offered, so your line always flows. --- About subscriptions - Yearly plan: 4,000 JPY / year (auto-renewing) - Monthly plan: 500 JPY / month (auto-renewing) - Lifetime: 8,000 JPY (one-time purchase, does not renew) Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period, and are billed to your Apple ID. You can cancel anytime in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://ryoogasawara981.github.io/stem-line-designer/privacy.html
Screenshots
Verdict
The clearest difference is iOS requirement: 山形工房 けん玉 大空 OZORA KENDAMA at 11.0 against STEM Line Builder's 15.0. On price, update cadence, ads and in-app purchases 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.
山形工房 けん玉 大空 OZORA KENDAMA ships an update every 3 weeks, STEM Line Builder every 2 weeks. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.
| Parameter | 山形工房 けん玉 大空 OZORA KENDAMA | STEM Line Builder |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 3 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 60 MB | 118 MB |
| Age rating | 12+ | 4+ |
| Developer | DCS CO.,LTD. | Ryo Ogasawara |
In-app purchases
山形工房 けん玉 大空 OZORA KENDAMA
No in-app purchases
STEM Line Builder
No in-app purchases
Questions
Is 山形工房 けん玉 大空 OZORA KENDAMA free?
Is STEM Line Builder free?
Do 山形工房 けん玉 大空 OZORA KENDAMA or STEM Line Builder have ads?
Which is updated more often, 山形工房 けん玉 大空 OZORA KENDAMA or STEM Line Builder?
Other comparisons
