# Eruditus vs Underfoot

The clearest difference is in-app purchases: Eruditus at none against Underfoot's 2. Eruditus also leads on update cadence (every 2 days vs every 2 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Underfoot sells 2 in-app purchases, starting at $2.99 per month. Eruditus asks for nothing beyond the download.

Eruditus ships an update every 2 days, Underfoot every 2 months. The most recent releases landed on October 14, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Eruditus | Underfoot |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 2 months |
| Size | 50 MB | 102 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dust Productions, LLC](https://appshunter.io/developer/1530436091) | [Jason Brannon](https://appshunter.io/developer/1868090060) |

## What reviewers say

### Eruditus

[App page](https://appshunter.io/ios/app/eruditus/id1530436089)

**Features:** macOS Compatibility

**In-app purchases:** none


### Underfoot

[App page](https://appshunter.io/ios/app/underfoot-bug-field-guide/id6786962032)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Underfoot Pro | $2.99 | per month |
| Underfoot Pro Annual | $24.99 | per year |


## Frequently asked questions

### Is Eruditus free?

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

### Is Underfoot free?

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

### Do Eruditus or Underfoot have ads?

Neither Eruditus nor Underfoot shows ads.

### Which is updated more often, Eruditus or Underfoot?

Eruditus ships an update every 2 days, and Underfoot every 2 months. Most recently, Eruditus was updated on October 14, 2026 and Underfoot on October 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.*