Note: As of June 2026, Clumsy remains a widely trusted open-source tool. Avoid third-party websites offering "cracked" or "re-packed" versions to prevent malware. How to Use Clumsy 0.4 v2
Visit the jagt/clumsy GitHub page to access the latest releases.
: Randomly discards packets based on a chosen percentage chance to simulate severe packet loss.
One of Clumsy's best features is that it doesn't require a formal installation process. It's a portable tool. Simply and run the clumsy.exe file. As it operates at a system level to intercept your network traffic, you will need to grant it administrative privileges to run. clumsy 04 v2 download full
: Developers use it to track down bugs that only appear under unstable network conditions, such as "hanging" UI components or timeout errors.
For more in-depth information, you can read the developer's blog on the origins of Clumsy .
: You can turn simulations on or off and alter parameters instantly while your target application is running. Core Functions of Clumsy Note: As of June 2026, Clumsy remains a
Restricts network traffic by holding back packets for a specific timeframe and then releasing them in a single batch.
Check the box next to your desired modifier (e.g., ), set your value to 250 (for 250ms of artificial ping), and click the Start button. Click Stop at any point to instantly normalize your network performance. Troubleshooting Common Issues "WinDivert driver failed to start" or Error 5
Ability to lag, drop, throttle, reorder, and duplicate packets [1]. : Randomly discards packets based on a chosen
However, it's crucial to note that the official Clumsy project's latest releases are newer, with version 0.3 being the last major stable version. This indicates that version 0.4 might be an unofficial fork, a very old development snapshot, or a mislabeled version of the tool.
Use sophisticated filtering expressions (similar to Wireshark) to target specific traffic (e.g., specific IPs, ports, or protocols like TCP/UDP) [1].
This is often the most powerful method. In Google, you can use the site: command to limit your search to a specific website. Here are some targeted searches you can try:
: Lightly nudges and modifies bits of the packet's contents. 💡 Key Benefits
Compared to hardware-based network emulators, Clumsy is free, accessible, and fast to deploy. It is the perfect tool for developers to simulate mobile network issues on a desktop PC, ensuring that their applications are robust and user-friendly.