# Mailbux vs PostFluency

The clearest difference is in-app purchases: Mailbux at none against PostFluency's 2. Mailbux also leads on update cadence (every 4 days vs every 8 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PostFluency sells 2 in-app purchases, starting at $9.99 per month. Mailbux asks for nothing beyond the download.

Mailbux ships an update every 4 days, PostFluency every 8 days. The most recent releases landed on October 3, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Mailbux | PostFluency |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mailbux/id6755738754/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 8 days |
| Monetization | Free | — |
| Size | 24 MB | 37 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CloudWish LLC](https://appshunter.io/developer/1778325497) | [PostFluency](https://appshunter.io/developer/1896588532) |

## What reviewers say

### Mailbux

[App page](https://appshunter.io/ios/app/mailbux/id6755738754)

A fast, secure, and beautifully designed email client for managing multiple accounts. It offers free business email hosting with professional features like custom domains, contacts, calendar, and cloud storage.

**Highlights:** Free business email hosting, Unified inbox for multiple accounts, Real-time notifications, Powerful search functionality, Customizable folders and labels, Seamless cross-device sync

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

**In-app purchases:** none


### PostFluency

[App page](https://appshunter.io/ios/app/postfluency-ai-caption-writer/id6768597919)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PostFluency Monthly Subscription | $9.99 | per month |
| PostFluency Pro Yearly | $49.99 | per year |


## Frequently asked questions

### Is Mailbux free?

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

### Is PostFluency free?

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

### Do Mailbux or PostFluency have ads?

Neither Mailbux nor PostFluency shows ads.

### Which is updated more often, Mailbux or PostFluency?

Mailbux ships an update every 4 days, and PostFluency every 8 days. Most recently, Mailbux was updated on October 3, 2026 and PostFluency on September 30, 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.*