PreScale
The open-source load tester that tells you why.
PreScale launched on August 12, 2026 with 3 votes, #2,940 of 23,274 launches that month and more than 50% of that year's launches.
What it does
PreScale is an open-source command-line load tester. Point it at any URL, it ramps virtual users, finds the route that breaks first, and tells you in plain English why it failed and how to fix it. Local-first, deterministic, Apache-2.0.
PreScale load-tests your app, finds the route that breaks first, and tells you why and how to fix it. Then it checks every deploy, on every pull request, so capacity never drops without you knowing. Open-source CLI, Apache-2.0.
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