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Fortio vs Plow: catalog facts
Fortio	Plow
Free Free to use, with the source code published on GitHub.	Free Free and open source under the Apache 2.0 licence.
Web, Self-hosted, Command line	Windows, Command line
Fixed queries-per-second load for repeatable tests Latency histograms and detailed statistics	Real-time metrics in both terminal and browser Uses fasthttp for high request rates
Aimed at developers and operators rather than casual users Measures servers under load, not page rendering speed	Tests HTTP endpoints only Should only be pointed at servers you are allowed to load test
Downloadable app, Self-hosted	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.