Continuous internet speed test tool

Internet speed stress test with long duration: long-term download and upload bandwidth (speed) test tool
Cross-platform: HTML (online), Windows, Linux, Android versions, free for non-commercial use (please contact us to get a commercial license)
Measures download and upload bandwidth, packet loss and round trip time (RTT, ping)
Measures and tracks bandwidth of your internet connection during a long (unlimited) period of time
Measures stability of internet connection (uptime in percents, bandwidth measurements)
Tracks connection outages and drops of bandwidth
Runs on your own Windows PC as a server, to check stability of your LAN/wifi router(s)

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

Use cases

Narrowing down the problem with internet, and finding root cause of the issue: ISP or hardware
Selecting the fastest and most reliable internet provider - 3G, 4G LTE, wifi, satellite, ADSL, FTTx
Internet stability test
Testing hardware: wifi/3G/4G routers, network adapters
Selecting best wifi/3G/4G router/modem/receiver location, best antenna orientation
Monitoring quality of satellite links, VPNs, IPSec tunnels, SD-WAN and regular internet connections
Measuring reliability of internet connection for mission critical applications, for consumer applications (e.g. youtube)
Measuring bandwidth of hosted servers - is it stable or not?
Troubleshooting internet problems when you work from home - connection drops with VPN, web meeting, skype, zoom, trader terminals
Internet stability tests at moving vehicles, trains, ships
Assuring ISP bandwidth for video streaming service providers
Monitoring quality and stability of own IP networks for internet service providers

Instructions

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 Continuous Speed Test tool, install it
Use your application, with the internet stress test tool running in background
When you experience a problem with the application - look into results of this test
If the test detects a downtime or low internet speed - it is problem of internet provider or hardware. If no problems detected - it is a problem of the application
Run the same internet stability test on another hardware: another device or another wifi router, or change location of antenna. You can run test on multiple devices at same time to see difference
If the test reports downtimes on multiple different devices - it is exactly problem of internet provider: send the results to the provider and let them fix the problem. If they are not able to fix it - use another internet provider
Contact us by email: support [at] startrinity [dot] com if you need an advice how to fix internet issues. We maintain a database of known issues with providers and hardware vendors

Run the test on Windows

Download installer for Windows

Screenshots:

Run test on Android

Download APK

Screenshots:

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

            wget http://startrinity.com/InternetQuality/startrinity_cst_linux_x64.tar.gz

            # 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

--output-measurements or -om [csv_file_path] - outputs measurements to a CSV file (if specified) or to console (stdout)
--download-limit or -d - max. download bandwidth in Mbps
--upload-limit or -u - max. upload bandwidth in Mbps
--mode or -m - one of the following modes:
- custom-server-as-server or csas - TCP and UDP test, upload and download without pauses, using your own server. This instance runs as server. Example: CST.CrossPlatform.exe --mode custom-server-as-server --server-port 9200 --output-measurements
- custom-server-as-client or csac - TCP and UDP test, upload and download without pauses. This instance runs as 'client'; you should run the same app on another device as a 'server'. Example: CST.CrossPlatform.exe --mode custom-server-as-client --server-host 192.168.0.10 --server-port 9200 --output-measurements --download-limit 10 --upload-limit 10

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

Reviews

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 months...an 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)

Charts to display the measurements
Measure jitter
Measure ping to default gateway to see difference between LAN/WAN issues
Traceroute statistics to detect problematic hop
Display RTT statistics towards multiple servers, with server's IP geolocation
Need something else? Please contact us to request new features, or to express your interest in already planned features.