Surf Rack vs STEM Line Builder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Surf Rack
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サーフィンするには必要なのは「波」「自分」と「サーフボード」だけ！ サーファーであれば自分のパーフェクトボードを見つけるのは一生の楽しみ、そしてそのボードに巡り合うまで、様々なボードを試したいと思ってる人もいるだろう。 ただ、買った全てのボードを保持するのも難しく場所的にも。。。 そんな時、簡単にサーファーならでは知りたい情報をまとめて掲載し販売が可能になります！そして、暇な時インスタグラムを見る感覚で全国で売られているサーフボードを閲覧できます！
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 ads: STEM Line Builder at none against Surf Rack's shown. STEM Line Builder also leads on update cadence (weekly vs every 2 months). On price, in-app purchases, device support and iOS requirement 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.
Surf Rack ships an update every 2 months, STEM Line Builder weekly. The most recent releases landed on September 18, 2026 and September 23, 2026 respectively.
| Parameter | Surf Rack | STEM Line Builder |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Weekly — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 63 MB | 98 MB |
| Age rating | 17+ | 4+ |
| Developer | OCEAN LIBERTA LIMITED LIABILITY CO. | Ryo Ogasawara |
In-app purchases
Surf Rack
No in-app purchases
STEM Line Builder
No in-app purchases
