# Surf Rack vs STEM Line Builder

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.

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.

## The numbers

| Metric | Surf Rack | STEM Line Builder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Weekly** |
| Size | 63 MB | 98 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [OCEAN LIBERTA LIMITED LIABILITY CO.](https://appshunter.io/developer/1621934040) | [Ryo Ogasawara](https://appshunter.io/developer/6793957355) |

## What reviewers say

### Surf Rack

[App page](https://appshunter.io/ios/app/surf-rack/id1621934038)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### STEM Line Builder

[App page](https://appshunter.io/ios/app/stem-line-builder-longboard/id6793957353)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Surf Rack free?

Surf Rack is free to download, with no in-app purchases.

### Is STEM Line Builder free?

STEM Line Builder is free to download, with no in-app purchases.

### Do Surf Rack or STEM Line Builder have ads?

Surf Rack shows ads; STEM Line Builder does not.

### Which is updated more often, Surf Rack or STEM Line Builder?

Surf Rack ships an update every 2 months, and STEM Line Builder weekly. Most recently, Surf Rack was updated on September 18, 2026 and STEM Line Builder on September 23, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*