Grippy vs STEM Line Builder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Grippy
This app provides access to a curated network of workouts designed by top coaches. It focuses on helping users improve their grip strength and overall progression in their training. The application is developed in partnership with Beastmaker.
- Workouts from top coaches
- Progression tracking
- Grip strength focus
- Beastmaker partnership
- Global coach network
Read full descriptionHide full description
Griptonite teams up with Beastmaker to bring you Grippy! The app brings you workouts from a network of top coaches around the world. Get a Grip on your progression.
STEM Line Builder
Read full descriptionHide full description
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 update cadence: STEM Line Builder at every 2 weeks against Grippy's every 6 weeks. Grippy's advantage is iOS requirement (12.1 vs 15.0). 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.
Grippy ships an update every 6 weeks, STEM Line Builder every 2 weeks. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.
| Parameter | Grippy | STEM Line Builder |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (18 ratings) — better | — |
| Positive reviews | 45.2% of reviews | — |
| Number of ratings | 18 — better | — |
| Update frequency | Every 6 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.1 — better | 15.0 |
| Further details — not scored | ||
| Size | 47 MB | 118 MB |
| Age rating | 4+ | 4+ |
| Developer | Cascom Ltd | Ryo Ogasawara |
In-app purchases
Grippy
No in-app purchases
STEM Line Builder
No in-app purchases
Questions
Is Grippy free?
Is STEM Line Builder free?
Do Grippy or STEM Line Builder have ads?
Which is updated more often, Grippy or STEM Line Builder?
Other comparisons
