# BuildSec 4.0 vs Viewer by SEPPmail

The clearest difference is update cadence: BuildSec 4.0 at every 2 months against Viewer by SEPPmail's every 13 months. Viewer by SEPPmail's advantage is iOS requirement (12.4 vs 16.4). On price, ads, in-app purchases and device support there is nothing between them.

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

BuildSec 4.0 ships an update every 2 months, Viewer by SEPPmail every 13 months. The most recent releases landed on September 19, 2026 and August 24, 2026 respectively.

## The numbers

| Metric | BuildSec 4.0 | Viewer by SEPPmail |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/viewer-by-seppmail/id6446402452/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 13 months |
| Monetization | — | Free |
| Size | 204 MB | 19 MB |
| Requires iOS | 16.4 | **12.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Telenot Electronic GmbH](https://appshunter.io/developer/401623741) | [SEPPmail AG](https://appshunter.io/developer/586785754) |

## What reviewers say

### BuildSec 4.0

[App page](https://appshunter.io/ios/app/buildsec-40/id1472711329)

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

**In-app purchases:** none


### Viewer by SEPPmail

[App page](https://appshunter.io/ios/app/viewer-by-seppmail/id6446402452)

This application allows you to receive, decrypt, and read secure emails with "secure-email.html" attachments. It is designed for users who have received encrypted messages sent via a SEPPmail Appliance.

**Highlights:** Receive encrypted emails, Decrypt secure attachments, Read secure email content, Supports SEPPmail Appliance encryption

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

**In-app purchases:** none


## Frequently asked questions

### Is BuildSec 4.0 free?

BuildSec 4.0 is free to download, with no in-app purchases.

### Is Viewer by SEPPmail free?

Viewer by SEPPmail is free to download, with no in-app purchases.

### Do BuildSec 4.0 or Viewer by SEPPmail have ads?

Neither BuildSec 4.0 nor Viewer by SEPPmail shows ads.

### Which is updated more often, BuildSec 4.0 or Viewer by SEPPmail?

BuildSec 4.0 ships an update every 2 months, and Viewer by SEPPmail every 13 months. Most recently, BuildSec 4.0 was updated on September 19, 2026 and Viewer by SEPPmail on August 24, 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.*