# Polymail vs CosmoSia

The clearest difference is review sentiment: Polymail at 63% against CosmoSia's 18%. Polymail also leads on rating (3.9 vs 1.0) and in-app purchases (none vs 1). On price, update cadence, monetization model 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. Polymail asks for nothing beyond the download.

Polymail holds the better App Store score, 3.9 against 1.0. That said, the two scores are not equally well evidenced: Polymail has 86 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 63% of Polymail's written reviews are positive against 18% of CosmoSia's.

Polymail 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 | Polymail | CosmoSia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (86 ratings)](https://appshunter.io/ios/app/polymail-email-inbox/id1082058386/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/cosmosia/id1566565605/reviews) |
| Number of ratings | **86** | 1 |
| Positive reviews | **62.9% of reviews** | 17.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 40 MB | 219 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Polymail, Inc.](https://appshunter.io/developer/1082058385) | [ACCESS CO., LTD.](https://appshunter.io/developer/364885144) |

## What reviewers say

### Polymail

[App page](https://appshunter.io/ios/app/polymail-email-inbox/id1082058386)

This app acts as an email command center for professionals, offering features like real-time open tracking, scheduled sends, and message snoozing. It helps users manage their inbox efficiently for sales, fundraising, and deal-making.

**Highlights:** Real-time open tracking, Scheduled email sends, Snooze messages, Swipe actions for organization, Contact data and social context, Templates and reminders, Attachment and click tracking

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Smooth and intuitive interface
- 📨 Reliable email tracking and notifications
- 🔒 Secure and private
- 👍 Helpful features like send later and read later
- 💻 Seamless sync between mobile and desktop apps

**What reviewers complain about**

- 🐛 Buggy and unreliable sync between devices
- 🔍 Inconsistent search and email loading issues
- 💰 Expensive paid plans compared to alternatives
- 🔒 Privacy concerns around data collection

**Reported bugs**

- Frequent app crashes and freezes
- Unread email count not syncing properly
- Deleted emails reappearing in inbox
- Issues with email attachments and formatting

**Requested features**

- Customizable email templates
- Advanced email organization tools (e.g. flags, categories)
- Support for more email providers (IMAP, Exchange, etc.)
- Improved mobile app stability and performance


### 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 Polymail free?

Polymail 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, Polymail or CosmoSia?

Polymail is rated higher. Polymail averages 3.9 out of 5 from 86 ratings, while CosmoSia averages 1.0 from 1 ratings.

### Do Polymail or CosmoSia have ads?

CosmoSia shows ads; Polymail does not.

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

Polymail ships an update fortnightly, and CosmoSia every 3 weeks. Most recently, Polymail 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.*