# Flow vs PostFox

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

Both are free to download. PostFox sells 4 in-app purchases, starting at $17.99 per month. Flow asks for nothing beyond the download.

Flow ships an update every 3 weeks, PostFox every 3 months. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Flow | PostFox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 528 MB | 13 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 12+ | 4+ |
| Developer | [Rheosoph GmbH](https://appshunter.io/developer/1663636734) | [Sergei Penskii](https://appshunter.io/developer/1762100315) |

## What reviewers say

### Flow

[App page](https://appshunter.io/ios/app/flow-like-workflow-engine/id6746481584)

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

**In-app purchases:** none


### PostFox

[App page](https://appshunter.io/ios/app/postfox/id6754407815)

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PostFox Pro (Monthly) | $17.99 | per month |
| PostFox Business (Monthly) | $64.99 | per month |
| PostFox Pro (Yearly) | $179.99 | per year |
| PostFox Business (Yearly) | $649.99 | per year |


## Frequently asked questions

### Is Flow free?

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

### Is PostFox free?

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

### Do Flow or PostFox have ads?

Neither Flow nor PostFox shows ads.

### Which is updated more often, Flow or PostFox?

Flow ships an update every 3 weeks, and PostFox every 3 months. Most recently, Flow was updated on October 11, 2026 and PostFox 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.*