loadr

A developer-first load testing platform that combines ideas from k6, JMeter, Gatling, and Locust into a single Rust binary. It solves the problem of needing multiple tools for load testing by offering declarative YAML tests, embedded JavaScript, six protocols, plugins, a built-in live web UI, and distributed execution with exact percentiles. It targets developers, ops, and engineering teams in B2B settings, from startups to enterprises. It is positioned as a unified, single-binary alternative to existing load testing tools, with a focus on honest metrics and code-reviewable tests.

Key features

• Declarative YAML test definitions
• Embedded JavaScript for logic
• Six built-in protocols
• Plugin support (WASM & native)
• Built-in live web UI
• Distributed execution with exact percentiles
• HDR histograms for exact p99.9
• Open-model arrival-rate executors
• Session recorder (HTTP proxy)
• Generate tests from OpenAPI, Postman, GraphQL, gRPC
• AI copilot for scenario writing
• Import from JMX and k6 scripts
• Desktop app with forms-first editor
• Visual canvas editor for test plans