# SpamBlocker vs CosmoSia

The clearest difference is rating: SpamBlocker at 2.8 against CosmoSia's 1.0. SpamBlocker also leads on ads (none vs shown) and monetization model (free vs free with in-app purchases). CosmoSia's advantage is update cadence (every 3 weeks vs every 3 months). On price, review sentiment, in-app purchases and device support there is nothing between them.

Both are free to download. SpamBlocker sells 1 one-off in-app purchase 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.

SpamBlocker holds the better App Store score, 2.8 against 1.0. That said, the two scores are not equally well evidenced: SpamBlocker has 6 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 14% of SpamBlocker'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.

SpamBlocker ships an update every 3 months, CosmoSia every 3 weeks. The most recent releases landed on June 25, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | SpamBlocker | CosmoSia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.8 (6 ratings)](https://appshunter.io/ios/app/spamblocker/id570617592/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/cosmosia/id1566565605/reviews) |
| Number of ratings | **6** | 1 |
| Positive reviews | 13.9% of reviews | **17.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 219 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Seimitsusakufu LLC](https://appshunter.io/developer/459361672) | [ACCESS CO., LTD.](https://appshunter.io/developer/364885144) |

## What reviewers say

### SpamBlocker

[App page](https://appshunter.io/ios/app/spamblocker/id570617592)

This app helps manage unwanted emails by reassigning spam mailboxes and filtering incoming messages. It uses machine learning and rule-based systems to identify and block junk mail, supporting IMAP/POP3 accounts. It does not have mail sending capabilities.

**Highlights:** Spam/Trash mailbox reassignment, Machine learning spam filtering, Rule-based filtering (sender, subject), IMAP/POP3 support, HTML image blocking, Multi-account support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ad&Limitation | $0.99 | one-time |


### 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 SpamBlocker free?

SpamBlocker 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, SpamBlocker or CosmoSia?

SpamBlocker is rated higher. SpamBlocker averages 2.8 out of 5 from 6 ratings, while CosmoSia averages 1.0 from 1 ratings.

### Do SpamBlocker or CosmoSia have ads?

CosmoSia shows ads; SpamBlocker does not.

### Which is updated more often, SpamBlocker or CosmoSia?

SpamBlocker ships an update every 3 months, and CosmoSia every 3 weeks. Most recently, SpamBlocker was updated on June 25, 2026 and CosmoSia on September 21, 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.*