# Boulder Pass vs Japan SDF style Pull

The clearest difference is ads: Boulder Pass at none against Japan SDF style Pull's shown. Boulder Pass also leads on update cadence (every 3 weeks vs every 38 months). Japan SDF style Pull's advantage is iOS requirement (13.0 vs 15.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Boulder Pass ships an update every 3 weeks, Japan SDF style Pull every 38 months. The most recent releases landed on October 18, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Boulder Pass | Japan SDF style Pull |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 38 months |
| Size | 21 MB | 30 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Williams Kwan](https://appshunter.io/developer/1658651535) | [MINERVA K.K.](https://appshunter.io/developer/1597905460) |

## What reviewers say

### Boulder Pass

[App page](https://appshunter.io/ios/app/boulder-pass/id1658651533)

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

**In-app purchases:** none


### Japan SDF style Pull

[App page](https://appshunter.io/ios/app/japan-sdf-style-pull-upsarmy/id6448937189)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Boulder Pass free?

Boulder Pass is free to download, with no in-app purchases.

### Is Japan SDF style Pull free?

Japan SDF style Pull is free to download, with no in-app purchases.

### Do Boulder Pass or Japan SDF style Pull have ads?

Japan SDF style Pull shows ads; Boulder Pass does not.

### Which is updated more often, Boulder Pass or Japan SDF style Pull?

Boulder Pass ships an update every 3 weeks, and Japan SDF style Pull every 38 months. Most recently, Boulder Pass was updated on October 18, 2026 and Japan SDF style Pull on October 25, 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.*