# Email.cz vs CosmoSia

The clearest difference is rating: Email.cz at 4.6 against CosmoSia's 1.0. Email.cz also leads on in-app purchases (none vs 1) and ads (none vs shown). On price, review sentiment, update cadence and device support there is nothing between them.

Both are free to download. CosmoSia sells 1 in-app purchase, starting at $2.99 per month. Email.cz asks for nothing beyond the download.

Email.cz holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Email.cz has 58 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 13% of Email.cz's written reviews are positive against 18% of CosmoSia's, so the app with the better star average is not the one people write more warmly about.

Email.cz ships an update monthly, CosmoSia every 3 weeks. The most recent releases landed on November 10, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Email.cz | CosmoSia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (58 ratings)](https://appshunter.io/ios/app/emailcz/id965773009/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/cosmosia/id1566565605/reviews) |
| Number of ratings | **58** | 1 |
| Positive reviews | 13.1% of reviews | **17.9% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 27 MB | 219 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Seznam.cz a.s.](https://appshunter.io/developer/323858901) | [ACCESS CO., LTD.](https://appshunter.io/developer/364885144) |

## What reviewers say

### Email.cz

[App page](https://appshunter.io/ios/app/emailcz/id965773009)

Manage all your email accounts from one place with this app. Access your folders, search old messages, and send emails even when offline. It adapts to your device's dark or light mode and offers enhanced security.

**Highlights:** Unified inbox for multiple accounts, Offline email access and sending, Quick search for older messages, Dark/Light mode adaptation, Enhanced security features, Folder management

**Features:** Vision Pro support

**In-app purchases:** none


### 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 Email.cz free?

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

### Is CosmoSia free?

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

### Which has better reviews, Email.cz or CosmoSia?

Email.cz is rated higher. Email.cz averages 4.6 out of 5 from 58 ratings, while CosmoSia averages 1.0 from 1 ratings.

### Do Email.cz or CosmoSia have ads?

CosmoSia shows ads; Email.cz does not.

### Which is updated more often, Email.cz or CosmoSia?

Email.cz ships an update monthly, and CosmoSia every 3 weeks. Most recently, Email.cz was updated on November 10, 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.*