# Concentrations vs Mole OTG

The clearest difference is ads: Concentrations at none against Mole OTG's shown. Mole OTG's advantage is update cadence (daily vs every 3 months) and device support (3 vs 1). On price and in-app purchases there is nothing between them.

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

Concentrations ships an update every 3 months, Mole OTG daily. The most recent releases landed on October 17, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Concentrations | Mole OTG |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Daily** |
| Size | 7 MB | 31 MB |
| Requires iOS | 18.5 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Marcal Casas Cartagena](https://appshunter.io/developer/468150889) | [Japality Limited](https://appshunter.io/developer/1574046707) |

## What reviewers say

### Concentrations

[App page](https://appshunter.io/ios/app/concentrations/id468150886)

**In-app purchases:** none


### Mole OTG

[App page](https://appshunter.io/ios/app/mole-otg/id6749512146)

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

**In-app purchases:** none


## Frequently asked questions

### Is Concentrations free?

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

### Is Mole OTG free?

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

### Do Concentrations or Mole OTG have ads?

Mole OTG shows ads; Concentrations does not.

### Which is updated more often, Concentrations or Mole OTG?

Concentrations ships an update every 3 months, and Mole OTG daily. Most recently, Concentrations was updated on October 17, 2026 and Mole OTG on October 20, 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.*