Download

Get GSTNet Secure

End-to-end encrypted messaging, voice and video calls, and file transfer. New users get 90 days of full access, one introductory period per device. No credit card required.

📘 New here? Get the User Guide ↓
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iPhone & iPad

Get GSTNet Secure from the App Store. You can create your free account right in the app.

  • Messaging, voice, video and group calls
  • Encrypted file transfer
  • On-device message translation (about 20 languages)
  • Interface in English, Persian and Japanese
Download on theApp Store

Requires iOS 26.5 or later.

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Windows

Download the GSTNet Secure installer for Windows. Register on our website first to get your GST-ID.

  • Messaging, voice and video calls
  • Encrypted file transfer
  • Interface in 19 languages
Download for Windows

For Windows 10 and 11 (64-bit).

Important: one device per GST-ID

You cannot use the same GST-ID on your iPhone, iPad and Windows computer at the same time. Use each GST-ID on one device only. To switch devices, sign out on the old one first.

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★ Free User Guide

New to GSTNet? Start Here.

Step-by-step help for iPhone, iPad and Windows: create your GST-ID, add contacts, make calls, translate messages and more. Available in 8 languages.

English Deutsch Français 日本語 Indonesia 中文 Tiếng Việt فارسی
⬇ Download User GuidePDF · 8 languages 📖 Read Online
Getting Started

Three Steps

  1. Create your account. In the iPhone or iPad app, tap Create Account. On Windows, register on our website. You receive your GST-ID.
  2. Add a contact. Open the Contacts tab, tap Add Contact and enter the other person's GST-ID.
  3. Start talking. Send messages, make voice and video calls, and share files, all end-to-end encrypted. Need help? Read the User Guide.