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clumsy vs Toxiproxy: catalog facts
clumsy	Toxiproxy
Best for: Developers testing apps under lag, packet loss or bad connections	Best for: Developers testing how applications handle network failures
Free Free and open source under the MIT licence.	Free Free and open source under the MIT license.
Windows	Self-hosted, Command line
Works on any application without proxy or code changes Supports TCP and UDP, including localhost traffic All 4 strengths for clumsy Works on any application without proxy or code changes Supports TCP and UDP, including localhost traffic Portable, with no installation Interactive controls with visual feedback	Simulates latency, bandwidth limits, and connection failures Controls proxies through an HTTP API All 3 strengths for Toxiproxy Simulates latency, bandwidth limits, and connection failures Controls proxies through an HTTP API Supports deterministic network fault testing
Windows only Still at version 0.3	Requires applications to route test connections through the proxy
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: MIT	License: MIT
No account needed	Not stated if an account is needed
Offline features available	Not stated if it works offline
Official website Full listing and sources Sources for clumsy jagt.github.io/clumsy Catalog checked October 2, 2026	Official website Full listing and sources Sources for Toxiproxy github.com/shopify/toxiproxy Catalog checked October 8, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.