Continuous internet speed test tool

Download for Windows Download for Android Command line / Linux / MacOS... Frequently asked questions

Use cases


Assumption: you experience bad internet quality when you use an application: web site in browser, messenger, trading terminal, etc, you want to fix the problem, and you want to know what exactly happens - is it problem of internet provider, your device, wifi router, antenna location, or the app itself.

Run the test on Windows

Download installer for Windows

Run test on Android

Download APK

Run the internet test tool from command line with a web UI

Download for Linux x64 (Most desktop distributions like CentOS, Debian, Fedora, Ubuntu, Red Hat Enterprise Linux 6+, and derivatives)
Download for Linux ARM (Linux distributions running on ARM like Raspbian on Raspberry Pi Model 2+)
Download for Linux ARM64 (Linux distributions running on 64-bit ARM like Ubuntu Server 64-bit on Raspberry Pi Model 3+)
Download for MacOS (Minimum OS version is macOS 10.12 Sierra)
Download for Windows x64 (for desktop GUI see another installer)
Download for Windows x86
Note: please download the archive and extract into some clean folder. On Linux set 'executable' attribute to extracted file "CST.CrossPlatform" if needed:
# use this if needed for permissions: sudo -i
mkdir /usr/bin/startrinity_cst
cd /usr/bin/startrinity_cst
# if wget is missing on centos/rhel: sudo yum install wget
# or startrinity_cst_linux_arm.tar.gz or startrinity_cst_linux_arm64.tar.gz (see above)
tar xzvf startrinity_cst_linux_x64.tar.gz
./CST.CrossPlatform --download-limit 10 --upload-limit 10 --output-measurements

Command line example for Linux: ./CST.CrossPlatform --download-limit 10 --upload-limit 10 --output-measurements
Command line example for Windows: CST.CrossPlatform.exe --download-limit 10 --upload-limit 10 --output-measurements

Command line arguments

If you want to get binaries for some other OS from this list, please contact us.


This is exactly what I needed to align my 4G outdoor receiver to get the maximum possible speed. Instead of running a speed test or downloading a content after each alignment, this app makes it pretty easy.

Great work! I have used the continuous speed test several times to get my cable company to fix the internet connection.
someone in US

The Continuous Speed Test helped me narrow down a problem that had been plaguing my system for intermittent failure of a wireless card on one of my computers. The card only failed - and briefly - when a significant amount of data was being transferred through it. So, I set up the Continous Speed Test on the impacted device and on a laptop connected to the same WiFi. The failures on the internet stability test were obvious and helped me trace down the problem. I swapped out the bad card and the problem was fixed! Thank you!
someone in US

This is the only app I have found that runs continuously while I adjust my cellular modem antenna for not only the best speed but the best quality. Since I live in an area with low cellular signal, this is important to me. other apps just tell me the speed at a single moment. Thanks for the great app!

Great program. Used it to diagnose a connection issue, and it worked great. I bookmarked the site and will install it again in the future if I need it.

I love your test tool, it is helping me to understand the real issues with my internet connection. I have a VDSL connection with approx. 18Mbps down and 1Mbps up.
someone in New Zealand

First Review: App is good, You can check your internet connection speed in different areas of your room or any other place and know downtime and uptime for a specific speed as you set, I liked this new concept.
Edit: One problem I found is speed is not accurate, When my net speed is 100kbps it shows 200-250 kbps.

Change Log

2019-06-18 easy GUI to run the tool as your own server, to test your LAN and wifi routers
2020-05-12 improved CPU performance
2020-05-23 fixed "false downtime" issue
2020-06-02 added TCP download and upload tests
2020-06-02 published binaries for Linux (Ubuntu, CentOS, Red Hat, Raspberry Pi): now the tool runs with command line interface and it also opens a HTTP port for web UI
2020-08-08 new test mode: only continuous ICMP ping, without any download/upload
2020-08-23 improved performance for low bandwidths (20kbps)
2020-09-06 measuring jitter and packet loss burst length
2020-09-25 published binaries for "Center" and tutorial how to set up monitoring with custom server(s), center and MySQL database

Roadmap (planned features)