# FLOWin vs Duodoku

The clearest difference is update cadence: Duodoku at every 3 weeks against FLOWin's every 32 months. FLOWin's advantage is iOS requirement (13.0 vs 16.4). On price, in-app purchases and device support there is nothing between them.

Both are free to download. FLOWin sells 5 one-off in-app purchases and Duodoku sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

FLOWin ships an update every 32 months, Duodoku every 3 weeks. The most recent releases landed on October 14, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | FLOWin | Duodoku |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | — | Yes |
| Update frequency | Every 32 months | **Every 3 weeks** |
| Size | 157 MB | 91 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Jan Kot](https://appshunter.io/developer/1506831182) | [Al Firma](https://appshunter.io/developer/1683492148) |

## What reviewers say

### FLOWin

[App page](https://appshunter.io/ios/app/flowin/id1539927147)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Starter Pack | $1.99 | one-time |
| 20k Energy | $1.99 | one-time |
| 50k Energy | $3.99 | one-time |
| 100k Energy | $6.99 | one-time |
| 200k Energy | $12.99 | one-time |


### Duodoku

[App page](https://appshunter.io/ios/app/duodoku-multiplayer-sudoku/id6448099658)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Subscription | $1.99 | per 7 days |
| Premium Subscription | $3.99 | per month |
| Premium Subscription | $24.99 | per year |


## Frequently asked questions

### Is FLOWin free?

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

### Is Duodoku free?

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

### Which is updated more often, FLOWin or Duodoku?

FLOWin ships an update every 32 months, and Duodoku every 3 weeks. Most recently, FLOWin was updated on October 14, 2026 and Duodoku on October 24, 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.*