# Nautilus vs Cat's Study

The clearest difference is in-app purchases: Nautilus at none against Cat's Study's 6. Nautilus also leads on ads (none vs shown). Cat's Study's advantage is iOS requirement (16.6 vs 18.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Cat's Study sells 6 in-app purchases, starting at $2.49 per month. Nautilus asks for nothing beyond the download.

Nautilus ships an update every 5 days, Cat's Study every 4 days. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Nautilus | Cat's Study |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 days | **Every 4 days** |
| Size | 36 MB | 162 MB |
| Requires iOS | 18.0 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HIROTO IGUCHI](https://appshunter.io/developer/1860756373) | [Lo-Fi Labs Inc.](https://appshunter.io/developer/6796905768) |

## What reviewers say

### Nautilus

[App page](https://appshunter.io/ios/app/nautilus-focus-and-app-blocker/id6780439827)

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

**In-app purchases:** none


### Cat's Study

[App page](https://appshunter.io/ios/app/cats-study-focus-timer/id6816829300)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cat's Study Pro Monthly | $2.49 | per month |
| Cat's Study Pro Annual | $14.49 | per year |
| 100 Coins | $1.49 | one-time |
| 500 Coins | $6.49 | one-time |
| 1,000 Coins | $9.99 | one-time |
| Cat's Study Pro Lifetime | $33.49 | one-time |


## Frequently asked questions

### Is Nautilus free?

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

### Is Cat's Study free?

Cat's Study is free to download, with in-app purchases available.

### Do Nautilus or Cat's Study have ads?

Cat's Study shows ads; Nautilus does not.

### Which is updated more often, Nautilus or Cat's Study?

Nautilus ships an update every 5 days, and Cat's Study every 4 days. Most recently, Nautilus was updated on October 11, 2026 and Cat's Study 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.*