# Voltage Mail vs Atrebo TREE

Voltage Mail and Atrebo TREE are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 1, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Voltage Mail | Atrebo TREE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.7 (736 ratings)](https://appshunter.io/ios/app/voltage-mail/id516444730/reviews)** | — |
| Number of ratings | **736** | — |
| Positive reviews | 8.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Freemium | — |
| Size | 24 MB | 60 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OpenText](https://appshunter.io/developer/415355796) | [Alteda](https://appshunter.io/developer/794504693) |

## What reviewers say

### Voltage Mail

[App page](https://appshunter.io/ios/app/voltage-mail/id516444730)

Securely read and compose encrypted emails on your mobile device. This app allows you to send and receive secure messages, integrating with your existing email accounts and offering robust security features for organizations.

**Highlights:** Read encrypted emails and attachments, Compose new secure email messages, Send and receive secure emails, Integrates with native email apps, Supports mobile policy restrictions, Simple self-registration and authentication

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 💡 Simple and effective email encryption
- 👍 Works well for external and internal users
- 👍 Easy to set up and use

**What reviewers complain about**

- 🐛 Doesn't work on iPhone or iPad
- 🐛 Crashes frequently
- 🐛 Confusing and unintuitive user experience
- 🐛 Unable to download or print attachments
- 🐛 Requires multiple steps to access messages

**Reported bugs**

- Login screen freezes
- Incompatible with older devices
- Frequent crashes and errors
- Unable to access or download messages

**Requested features**

- Add support for more mobile devices and operating systems
- Improve user interface and streamline the message access process
- Allow downloading and printing of attachments
- Better integration with popular email clients


### Atrebo TREE

[App page](https://appshunter.io/ios/app/atrebo-tree/id6753858908)

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

**In-app purchases:** none


## Frequently asked questions

### Is Voltage Mail free?

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

### Is Atrebo TREE free?

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

### Do Voltage Mail or Atrebo TREE have ads?

Neither Voltage Mail nor Atrebo TREE shows ads.

### Which is updated more often, Voltage Mail or Atrebo TREE?

Voltage Mail ships an update every 2 months, and Atrebo TREE every 2 months. Most recently, Voltage Mail was updated on November 1, 2026 and Atrebo TREE on October 25, 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.*