# MailBuzzr for Outlook vs CosmoSia

The clearest difference is review sentiment: MailBuzzr for Outlook at 66% against CosmoSia's 18%. MailBuzzr for Outlook also leads on rating (4.1 vs 1.0) and ratings volume (518 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. MailBuzzr for Outlook sells 9 in-app purchases, starting at $9.99 per month and CosmoSia sells 1 in-app purchase, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

MailBuzzr for Outlook holds the better App Store score, 4.1 against 1.0. That said, the two scores are not equally well evidenced: MailBuzzr for Outlook has 518 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 66% of MailBuzzr for Outlook's written reviews are positive against 18% of CosmoSia's.

MailBuzzr for Outlook ships an update fortnightly, CosmoSia every 3 weeks. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | MailBuzzr for Outlook | CosmoSia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (518 ratings)](https://appshunter.io/ios/app/mailbuzzr-for-outlook/id476346562/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/cosmosia/id1566565605/reviews) |
| Number of ratings | **518** | 1 |
| Positive reviews | **65.7% of reviews** | 17.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 38 MB | 219 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [AverSys Mobile](https://appshunter.io/developer/476346565) | [ACCESS CO., LTD.](https://appshunter.io/developer/364885144) |

## What reviewers say

### MailBuzzr for Outlook

[App page](https://appshunter.io/ios/app/mailbuzzr-for-outlook/id476346562)

Manage your Outlook, Hotmail, and Live email accounts with this app. It offers a unified inbox, smart sorting of important mail like travel and bills, and tools to unsubscribe from unwanted newsletters. Features include customizable alerts, quick cleanup routines, and privacy controls.

**Highlights:** Unified inbox for multiple accounts, Smart sorting of travel, bills, and subscriptions, One-tap unsubscribe from newsletters, Customizable smart alerts, Quick email cleanup routines, Attachment and contact management, App Lock for privacy

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited - Monthly | $9.99 | per month |
| Unlimited - Yearly | $39.99 | per year |
| No Ads | $1.99 | one-time |
| Upgrade to Lite | $2.99 | one-time |
| Upgrade to Pro | $2.99 | one-time |
| Lite | $3.99 | one-time |
| Upgrade to Pro | $3.99 | one-time |
| Remove ads | $9.99 | one-time |
| Pro | $12.99 | one-time |

**What reviewers like**

- 🚀 Fast and reliable
- 👍 Easy to use
- 🔒 Secure email access
- 💡 Convenient email management
- 👍 Great app design and interface

**What reviewers complain about**

- 🐛 Crashes and freezes
- 🐛 Sync and connectivity issues
- 🐛 Deleted emails reappearing
- 🐛 Attachment and draft handling problems
- 🔋 High battery consumption

**Reported bugs**

- Login issues and password problems
- Notifications not working properly
- Compatibility problems with newer iOS versions
- Slow email loading and refreshing

**Requested features**

- Add more email account support
- Improve email organization and search
- Implement a junk mail folder
- Allow bulk email deletion
- Add customization options


### CosmoSia

[App page](https://appshunter.io/ios/app/cosmosia/id1566565605)

Create a personalized email address with your own domain, offering carrier-like ease of use and robust privacy features. Manage multiple email accounts, block unwanted messages, and enjoy a user-friendly interface. Ideal for those seeking a professional or custom email solution.

**Highlights:** Create custom email addresses, Manage multiple email accounts, Block unwanted emails, Easy setup, Carrier-like usability, Privacy-focused

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CosmoSia Mail Plan(Monthly) | $2.99 | per month |


## Frequently asked questions

### Is MailBuzzr for Outlook free?

MailBuzzr for Outlook is free to download, with in-app purchases available.

### Is CosmoSia free?

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

### Which has better reviews, MailBuzzr for Outlook or CosmoSia?

MailBuzzr for Outlook is rated higher. MailBuzzr for Outlook averages 4.1 out of 5 from 518 ratings, while CosmoSia averages 1.0 from 1 ratings.

### Do MailBuzzr for Outlook or CosmoSia have ads?

Both MailBuzzr for Outlook and CosmoSia show ads.

### Which is updated more often, MailBuzzr for Outlook or CosmoSia?

MailBuzzr for Outlook ships an update fortnightly, and CosmoSia every 3 weeks. Most recently, MailBuzzr for Outlook was updated on November 6, 2026 and CosmoSia on November 3, 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.*