# Fishtank vs Moku

The clearest difference is in-app purchases: Moku at none against Fishtank's 4. Moku also leads on iOS requirement (13.0 vs 18.2). Fishtank's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Fishtank sells 4 one-off in-app purchases. Moku asks for nothing beyond the download.

Fishtank ships an update every 4 days, Moku every 3 weeks. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Fishtank | Moku |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/fishtank-focus-app/id6747935306/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 20 MB |
| Requires iOS | 18.2 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jiajun Zhang](https://appshunter.io/developer/1819165423) | [Atsushi Matsunami](https://appshunter.io/developer/6788283433) |

## What reviewers say

### Fishtank

[App page](https://appshunter.io/ios/app/fishtank-focus-app/id6747935306)

Enhance your concentration with a unique approach to productivity. This app gamifies focus sessions, allowing you to build a virtual aquarium filled with discovered fish. Earn rewards and track your progress as you stay on task.

**Highlights:** Customizable focus session lengths, App blocking for distraction prevention, Ambient background options, Progress tracking, Earn mystery lootboxes, Discover and collect rare fish, Virtual aquarium simulation

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Platinum Lootbox | $0.99 | one-time |
| Unlock Backgrounds | $1.99 | one-time |
| Speed Boost | $1.99 | one-time |
| 10x Platinum Lootboxes | $6.99 | one-time |


### Moku

[App page](https://appshunter.io/ios/app/moku-simple-focus-timer/id6790562993)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fishtank free?

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

### Is Moku free?

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

### Do Fishtank or Moku have ads?

Neither Fishtank nor Moku shows ads.

### Which is updated more often, Fishtank or Moku?

Fishtank ships an update every 4 days, and Moku every 3 weeks. Most recently, Fishtank was updated on October 16, 2026 and Moku on October 7, 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.*