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loadr
Find the breaking point — load testing in one Rust binary
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.
Hey everyone, maker here 👋
The origin story's up in the description, but the short version is loadr didn't start as a roadmap, it started as an experiment, one carefully-structured prompt to Claude Fable 5 while it was briefly available. What came back genuinely stopped me. Not a toy or a snippet, but a coherent, architecturally sound foundation, a real engine, the plugin seam, scripting wired in. It even generated little demo videos of itself running. So I kept building.
The parts I'm most proud of now:
• Percentiles you can actually trust, HDR histograms merged across threads, so p99.9 is real, not sampled.
• Scenarios in plain YAML, with embedded JavaScript (per-VU on QuickJS) when you need real logic.
• Protocols and datastores as installable plugins, so the core binary stays small.
• A live web UI baked into the binary, a desktop app, a drop-in CI gate, and observe, which pulls your server's Prometheus metrics after a run and lines them up against your latency timeline, so "p95 spiked" meets "the DB hit 90% CPU".
Honest caveats: it's source-available under Elastic-2.0 (not OSI open source), and still beta, HTTP/gRPC are rock solid, the browser-driven path is newer.
What genuinely excites me isn't "AI wrote it", it's how far one well-structured prompt got on a real systems-architecture problem. The gap between an idea and working code is closing faster than I expected.
Happy to go deep on any of it, the QuickJS-per-VU design, the HDR merge, even the original prompt. And I'd love to know: what would make loadr a daily driver for you?
Try it: https://loadr.io · Demos: https://loadr.io/demos/
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About loadr on Product Hunt
“Find the breaking point — load testing in one Rust binary”
loadr was submitted on Product Hunt and earned 5 upvotes and 1 comments, placing #159 on the daily leaderboard. 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 was featured in Software Engineering (42.7k followers), Developer Tools (515.4k followers) and GitHub (41.3k followers) on Product Hunt. Together, these topics include over 106.4k products, making this a competitive space to launch in.
Who hunted loadr ?
loadr was hunted by Andrew Rea. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Andrew Rea