# Email Aqua Mail Secure Client vs SISMS

The clearest difference is in-app purchases: SISMS at none against Email Aqua Mail Secure Client's 16. SISMS also leads on iOS requirement (15.2 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Email Aqua Mail Secure Client sells 12 in-app purchases, starting at $2.99 per 7 days. SISMS asks for nothing beyond the download.

Email Aqua Mail Secure Client ships an update monthly, SISMS every 3 weeks. The most recent releases landed on October 21, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Email Aqua Mail Secure Client | SISMS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (286 ratings)](https://appshunter.io/ios/app/email-aqua-mail-secure-client/id1633468505/reviews)** | — |
| Number of ratings | **286** | — |
| Positive reviews | 21.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Freemium | — |
| Size | 62 MB | 26 MB |
| Requires iOS | 17.0 | **15.2** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aqua Mail Inc.](https://appshunter.io/developer/1633468507) | [sami radhi](https://appshunter.io/developer/1858182458) |

## What reviewers say

### Email Aqua Mail Secure Client

[App page](https://appshunter.io/ios/app/email-aqua-mail-secure-client/id1633468505)

Consolidate all your email accounts into a single, secure inbox. This app offers smart features like a unified inbox, conversation view, and quick unsubscribe options to enhance productivity and protect your privacy.

**Highlights:** Unified inbox for multiple accounts, Smart inbox organization, Privacy and security focused, Easy account setup, One-tap unsubscribe, Fast search functionality, Bulk email actions

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get Full Access | $2.99 | per 7 days |
| Unlock Premium Features | $3.99 | per 7 days |
| Pro Monthly | $5.99 | per month |
| Unlock Pro features | $9.99 | per month |
| AquAI Monthly | $9.99 | per month |
| Pro Yearly | $19.99 | per year |
| Get Full Access | $29.99 | per year |
| Pro Yearly | $29.99 | per year |
| Get Full Access | $29.99 | per year |
| Pro Yearly | $29.99 | per year |
| Premium Yearly | $29.99 | per year |
| Get Full Access | $29.99 | per year |


### SISMS

[App page](https://appshunter.io/ios/app/sisms/id6756169410)

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

**In-app purchases:** none


## Frequently asked questions

### Is Email Aqua Mail Secure Client free?

Email Aqua Mail Secure Client is free to download, with in-app purchases available.

### Is SISMS free?

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

### Do Email Aqua Mail Secure Client or SISMS have ads?

Neither Email Aqua Mail Secure Client nor SISMS shows ads.

### Which is updated more often, Email Aqua Mail Secure Client or SISMS?

Email Aqua Mail Secure Client ships an update monthly, and SISMS every 3 weeks. Most recently, Email Aqua Mail Secure Client was updated on October 21, 2026 and SISMS on October 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*