# Swismail vs Zero Carbon

The clearest difference is iOS requirement: Zero Carbon at 11.0 against Swismail's 13. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Swismail ships an update every 5 weeks, Zero Carbon monthly. The most recent releases landed on September 10, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Swismail | Zero Carbon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/swismail/id1667190642/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | Free | — |
| Size | 90 MB | 22 MB |
| Requires iOS | 13 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Anisoft](https://appshunter.io/developer/1611832381) | [TheTowerTech](https://appshunter.io/developer/1259751444) |

## What reviewers say

### Swismail

[App page](https://appshunter.io/ios/app/swismail/id1667190642)

A secure email service designed to evolve with future technological trends. Protect your private conversations by downloading this application.

**Highlights:** Secure email service, Technologically evolving, Future trend adaptation, Private conversation security

**Features:** macOS Compatibility

**In-app purchases:** none


### Zero Carbon

[App page](https://appshunter.io/ios/app/zero-carbon-connect/id6447286723)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Swismail free?

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

### Is Zero Carbon free?

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

### Do Swismail or Zero Carbon have ads?

Neither Swismail nor Zero Carbon shows ads.

### Which is updated more often, Swismail or Zero Carbon?

Swismail ships an update every 5 weeks, and Zero Carbon monthly. Most recently, Swismail was updated on September 10, 2026 and Zero Carbon on September 12, 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.*