PreScale
Launch-readiness load testing for developers — find what breaks before your users do.
Point it at a URL. It ramps real traffic until something gives, then tells you, in plain English, what failed first, at what load — and why.
pip install prescale
prescale run https://staging.myapp.com
Scale readiness: ⚠️ Survives ~90 (75–110) concurrent users
First failure errors climb at ~150 users
Likely cause Server returned 5xx under load — likely a DB connection pool.
It isn't a framework you program (like k6 or Locust) — there's nothing to script. Point it, get an answer, fix, repeat.
Commands
prescale run <url>— ramp traffic; what breaks first and at what load, with a confidence band.prescale investigate <url>— probe the culprit route to explain why it breaks and how to fix it. Local, deterministic, no LLM.prescale audit <url>— load-free HTTP hygiene check (compression, caching, CDN, HTTP/2).prescale compare— capacity diff of two runs;--fail-under/--fail-on-regressionfor CI gating.prescale run --profile product-hunt— frame the verdict as a launch scenario ("would survive a Product Hunt #1 launch").prescale history/show/schema— saved runs and their versioned JSON contract.prescale mcp— run as an MCP server so a coding agent can load-test mid-build (pip install 'prescale[mcp]').
Why
- Zero config — no test scripts, no account; one command against a URL.
- Stack-agnostic — Vercel, Fly, Railway, a VPS, serverless… it just needs a URL.
- An answer, not a histogram — "you're good to ~90 users, your DB is the wall," and how to fix it.
- Safe by default — won't hammer a non-local host until you confirm you own it.
Requires Python 3.10+. Full docs, examples, and source: https://github.com/pyjeebz/PreScale
License
Apache 2.0 — find what breaks before your users do.
1 maintainer
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