Support

Support Contacts

Response time: up to 3 business days

We strive to respond to all inquiries as quickly as possible. When contacting us, please specify the app version and a detailed description of the issue.

Frequently Asked Questions

How to run a speed test?

Open the app, enter the iperf3 server address and port (default 5201), select the test type (TCP or UDP), and tap "Start Test". Make sure you have a stable internet connection.

What are the requirements for iperf3 server?

The server must run iperf3 version 3.0 or higher. The server port (usually 5201) must be open for incoming connections. The server should be started with the -s flag.

How to export test results?

After the test completes, tap the "Share" or "Export" button. You can choose the export format (CSV, JSON, TXT) and send results via email or messenger.

Why doesn't the test start?

Check your internet connection, server address, and port correctness. Ensure the server is running and accessible. Some networks may block non-standard ports.

Is my data secure?

Yes, the app does not share your personal data with third parties. Test results are stored locally on the device. Read more in our Privacy Policy.

How to add a custom server?

In the app settings, select "Server Profiles", tap "Add Server" and enter the profile name, server address, and port. Saved servers will be available for quick selection.

How to use server mode?

From the main menu, select "Server Mode", configure the port (default 5201) and tap "Start Server". Your phone will become an iperf3 server that other devices can connect to for testing.

What is Advanced mode?

Advanced mode allows you to manually configure all iperf3 launch parameters. You can add any command flags for precise test tuning: change buffer size, number of streams, output format, and other parameters.

Download the App

The iperf3 Client app is available in the following stores: