# CosmoSia vs black.com

The clearest difference is review sentiment: black.com at 67% against CosmoSia's 18%. black.com also leads on rating (3.6 vs 1.0) and ads (none vs shown). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. CosmoSia sells 1 in-app purchase, starting at $2.99 per month and black.com sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

black.com holds the better App Store score, 3.6 against 1.0. That said, the two scores are not equally well evidenced: black.com has 9 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 18% of CosmoSia's written reviews are positive against 67% of black.com's.

CosmoSia ships an update every 3 weeks, black.com every 6 weeks. The most recent releases landed on September 21, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | CosmoSia | black.com |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/cosmosia/id1566565605/reviews) | **[3.6 (9 ratings)](https://appshunter.io/ios/app/blackcom-encrypted-email/id1576695864/reviews)** |
| Number of ratings | 1 | **9** |
| Positive reviews | 17.9% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 219 MB | 14 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [ACCESS CO., LTD.](https://appshunter.io/developer/364885144) | [black.com GmbH](https://appshunter.io/developer/1576695866) |

## What reviewers say

### 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 |


### black.com

[App page](https://appshunter.io/ios/app/blackcom-encrypted-email/id1576695864)

Secure and encrypted email with a personalized @black.com address. Features AI writing tools for effortless composition, unlimited storage, and alias addresses to manage spam. Protects your data with zero-access encryption and app-based two-factor authentication.

**Highlights:** Personalized @black.com email address, Zero-access encryption, AI-powered email composition, Unlimited storage (25GB + annual increase), Spam-free alias addresses, App-based two-factor authentication

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Membership | $4.99 | per month |


## Frequently asked questions

### Is CosmoSia free?

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

### Is black.com free?

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

### Which has better reviews, CosmoSia or black.com?

black.com is rated higher. CosmoSia averages 1.0 out of 5 from 1 ratings, while black.com averages 3.6 from 9 ratings.

### Do CosmoSia or black.com have ads?

CosmoSia shows ads; black.com does not.

### Which is updated more often, CosmoSia or black.com?

CosmoSia ships an update every 3 weeks, and black.com every 6 weeks. Most recently, CosmoSia was updated on September 21, 2026 and black.com on September 17, 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.*