loadr

What it does

One prompt. While Claude Fable 5 was briefly available, we asked it to build a load tester in Rust that combined the best of k6, JMeter, Gatling and Locust — plugins, embedded scripting, distributed execution. It returned a real foundation, not a toy. We kept building. Today it's one Rust binary with declarative YAML + JavaScript tests, exact percentiles (HDR histograms — p99.9 is real, not sampled), installable protocol/datastore plugins, a live web UI, distributed agent runs and a CI gate.

loadr is a modern load testing platform: declarative YAML tests, embedded JavaScript, HTTP/2, WebSocket, gRPC, GraphQL, TCP & UDP, WASM plugins, distributed agents with exact percentiles, and a built-in live web UI. One binary.

loadr brings together the best ideas from k6, JMeter, Gatling and Locust in one place: declarative YAML tests, embedded JavaScript, six protocols, plugins, a built-in live web UI, and distributed execution with mathematically exact percentiles . All in one binary. live-demo — 1 scenario(s), 8.1s checks........................: 100.00% — ✓ 752 ✗ 0 ✓ status is 200 (376 / 376) ✓ under 200ms (376 / 376) http_req_duration.............: avg=4.96ms med=3.02ms p(95)=10.73ms p(99)=49.38ms http_req_tls_handshaking......: avg=0µs (connections reused per VU) http_req_waiting..............: avg=4.85ms med=2.90ms p(95)=10.57ms http_reqs.....................: 376 (46.66/s) iterations....................:…from loadr.io

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