# Jake for stratigraphy vs RockSpin

The clearest difference is in-app purchases: Jake for stratigraphy at none against RockSpin's 3. RockSpin's advantage is update cadence (every 2 days vs every 22 months) and iOS requirement (16.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. RockSpin sells 3 in-app purchases, starting at $9.99 per month. Jake for stratigraphy asks for nothing beyond the download.

Jake for stratigraphy ships an update every 22 months, RockSpin every 2 days. Both last shipped on October 4, 2026.

## The numbers

| Metric | Jake for stratigraphy | RockSpin |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 2 days** |
| Size | 1 MB | 81 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hunt Mountain Software](https://appshunter.io/developer/328710008) | [WOOHYUN JEON](https://appshunter.io/developer/1823158371) |

## What reviewers say

### Jake for stratigraphy

[App page](https://appshunter.io/ios/app/jake-for-stratigraphy/id1486090789)

**In-app purchases:** none


### RockSpin

[App page](https://appshunter.io/ios/app/rockspin/id6747876962)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Yearly | $99.99 | per year |
| 1,000 Credits | $14.99 | one-time |


## Frequently asked questions

### Is Jake for stratigraphy free?

Jake for stratigraphy is free to download, with no in-app purchases.

### Is RockSpin free?

RockSpin is free to download, with in-app purchases available.

### Do Jake for stratigraphy or RockSpin have ads?

Neither Jake for stratigraphy nor RockSpin shows ads.

### Which is updated more often, Jake for stratigraphy or RockSpin?

Jake for stratigraphy ships an update every 22 months, and RockSpin every 2 days. Most recently, Jake for stratigraphy was updated on October 4, 2026 and RockSpin on October 4, 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.*