Slows it down
Add a fixed or random delay. Find out what 300 ms of ping does to your loading spinner.
Test your app on a bad network
Bean Network Tester adds lag, packet loss and speed limits to a single Windows application. You get to see what your users see on a train, on hotel WiFi, or on a phone with one bar of signal.
Download for Windows See the code on GitHub
Free and open source under the GPLv3. Windows 10 and 11, 64-bit. No account, no telemetry.
What it does to your network
Loses packets
Drop, duplicate or corrupt them, then watch whether your app recovers or just hangs.
Caps the speed
Hold download or upload to a set number of KB per second, the way a weak mobile link does.
Breaks the link
Tear connections down, block a port or an address, or make the network come and go.
Aims at one app
Pick a process, a PID, an address or a port. The rest of the machine keeps working normally.
Repeats exactly
The same seed replays the same run. That is the difference between a bug report and a story.
Running it takes three steps
- Download the zip from the releases page and unpack it anywhere.
- Start
BeanNetworkTester.exe. It asks for administrator rights by itself, because capturing traffic needs them. - Pick a ready profile such as "3G network", press START, and use your app.
There is a text mode in the same file, so the whole thing also runs in a pipeline. One command is enough to check that your service survives 10 percent packet loss.
Who uses it
Testers who have to reproduce "it works on my machine". Developers who need a timeout to actually happen. Game developers checking what lag does to their netcode. Anyone who has ever been asked whether the app works on a weak connection and had no honest way to find out.