{"id":50561864,"url":"https://github.com/robimez/loadcell","last_synced_at":"2026-06-09T17:00:51.147Z","repository":{"id":362154822,"uuid":"1257588452","full_name":"RobiMez/loadcell","owner":"RobiMez","description":"don't pay 9$/m for loadtesting :) ","archived":false,"fork":false,"pushed_at":"2026-06-07T04:36:38.000Z","size":1153,"stargazers_count":72,"open_issues_count":1,"forks_count":4,"subscribers_count":0,"default_branch":"main","last_synced_at":"2026-06-08T16:28:57.734Z","etag":null,"topics":["load-testing","postman"],"latest_commit_sha":null,"homepage":"https://getloadcell.com/","language":"Svelte","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"gpl-3.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/RobiMez.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null,"notice":null,"maintainers":null,"copyright":null,"agents":null,"dco":null,"cla":null}},"created_at":"2026-06-02T20:28:45.000Z","updated_at":"2026-06-07T18:43:04.000Z","dependencies_parsed_at":null,"dependency_job_id":null,"html_url":"https://github.com/RobiMez/loadcell","commit_stats":null,"previous_names":["robimez/loadcell"],"tags_count":4,"template":false,"template_full_name":null,"purl":"pkg:github/RobiMez/loadcell","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/RobiMez%2Floadcell","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/RobiMez%2Floadcell/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/RobiMez%2Floadcell/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/RobiMez%2Floadcell/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/RobiMez","download_url":"https://codeload.github.com/RobiMez/loadcell/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/RobiMez%2Floadcell/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":34116461,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-05-26T15:22:16.424Z","status":"online","status_checked_at":"2026-06-09T02:00:06.510Z","response_time":63,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["load-testing","postman"],"created_at":"2026-06-04T12:01:16.406Z","updated_at":"2026-06-09T17:00:51.091Z","avatar_url":"https://github.com/RobiMez.png","language":"Svelte","funding_links":["https://github.com/sponsors/RobiMez"],"categories":[],"sub_categories":[],"readme":"\u003cdiv align=\"center\"\u003e\n\n\u003cimg src=\"site/loadcell.png\" width=\"96\" alt=\"LoadCell\" /\u003e\n\n# LoadCell\n\n**HTTP load testing, on your desktop.**\n\nA native app for hammering HTTP endpoints and watching what happens —\nconstant, ramp, or hand-drawn load curves with live RPS, latency\npercentiles, and error breakdowns.\n\n[![Latest release](https://img.shields.io/github/v/release/RobiMez/loadcell?style=flat-square\u0026logo=github\u0026label=release\u0026color=485941\u0026labelColor=2a342d)](https://github.com/RobiMez/loadcell/releases/latest)\n[![Total downloads](https://img.shields.io/github/downloads/RobiMez/loadcell/total?style=flat-square\u0026logo=github\u0026label=downloads\u0026color=485941\u0026labelColor=2a342d)](https://github.com/RobiMez/loadcell/releases)\n[![Release workflow](https://img.shields.io/github/actions/workflow/status/RobiMez/loadcell/release.yml?style=flat-square\u0026logo=githubactions\u0026label=release%20build\u0026color=485941\u0026labelColor=2a342d\u0026logoColor=white)](https://github.com/RobiMez/loadcell/actions/workflows/release.yml)\n[![License](https://img.shields.io/github/license/RobiMez/loadcell?style=flat-square\u0026color=485941\u0026labelColor=2a342d)](LICENSE)\n[![Sponsor](https://img.shields.io/github/sponsors/RobiMez?style=flat-square\u0026logo=githubsponsors\u0026label=sponsor\u0026color=c44d4d\u0026labelColor=2a342d\u0026logoColor=white)](https://github.com/sponsors/RobiMez)\n\n\u003csub\u003e\n\n[![macOS downloads](https://img.shields.io/github/downloads/RobiMez/loadcell/latest/loadcell-darwin-universal.tar.gz?style=flat-square\u0026label=macOS%20%C2%B7%20latest\u0026color=485941\u0026labelColor=2a342d)](https://github.com/RobiMez/loadcell/releases/latest/download/loadcell-darwin-universal.tar.gz)\n[![Windows downloads](https://img.shields.io/github/downloads/RobiMez/loadcell/latest/loadcell-windows-amd64.zip?style=flat-square\u0026label=Windows%20%C2%B7%20latest\u0026color=485941\u0026labelColor=2a342d)](https://github.com/RobiMez/loadcell/releases/latest/download/loadcell-windows-amd64.zip)\n[![Linux downloads](https://img.shields.io/github/downloads/RobiMez/loadcell/latest/loadcell-linux-amd64.tar.gz?style=flat-square\u0026label=Linux%20%C2%B7%20latest\u0026color=485941\u0026labelColor=2a342d)](https://github.com/RobiMez/loadcell/releases/latest/download/loadcell-linux-amd64.tar.gz)\n\n\u003c/sub\u003e\n\n\u003c/div\u003e\n\n\u003cbr/\u003e\n\n\u003cp align=\"center\"\u003e\n  \u003cimg src=\"site/loadcell-app.png\" alt=\"LoadCell results dashboard with saved-requests sidebar, run header, and a 100-second stacked-bar throughput chart.\" width=\"900\" /\u003e\n\u003c/p\u003e\n\n---\n\n## What it does\n\nLoadCell is built around the actual rhythm of load testing: pick a target,\nshape the load, watch it unfold, and read the result without deciphering\na wall of JSON.\n\n- **Live metrics** — p50, p95, p99 latency, RPS, and per-status breakdowns\n  (4xx / 429 / 5xx / network) updated every 100ms while the test runs.\n- **Three load profiles** — constant concurrency, linear ramp, or a\n  hand-drawn curve with linear, exponential, or step segments and a\n  noise envelope.\n- **Saved requests** — a Postman-style sidebar of HTTP requests with\n  method chips, full header/body editor, and a one-click \"Send\" for\n  smoke-testing before you load test.\n- **Saved runs** — every completed run is snapshotted to disk with its\n  config + history, so you can flip between past tests and watch the\n  chart re-hydrate.\n- **JSON in / JSON out** — request and response bodies get pretty-printed\n  + syntax highlighted; copy buttons on the response body and each\n  header value.\n- **Native, not a CLI** — desktop window with a real chart, not 200 lines\n  of terminal scroll. Built with Wails, Svelte, and D3.\n- **Local only** — runs, requests, and settings all live under\n  `~/Library/Application Support/loadcell/` (or the OS equivalent).\n  Nothing leaves your machine.\n\n---\n\n## Download\n\nGrab a prebuilt binary for your OS:\n\n| Platform | Asset | Notes |\n|---|---|---|\n| macOS · universal | [`loadcell-darwin-universal.tar.gz`](https://github.com/RobiMez/loadcell/releases/latest/download/loadcell-darwin-universal.tar.gz) | Apple Silicon + Intel |\n| Windows · amd64 | [`loadcell-windows-amd64.zip`](https://github.com/RobiMez/loadcell/releases/latest/download/loadcell-windows-amd64.zip) | Standalone `.exe` |\n| Linux · amd64 | [`loadcell-linux-amd64.tar.gz`](https://github.com/RobiMez/loadcell/releases/latest/download/loadcell-linux-amd64.tar.gz) | Built on Ubuntu 22.04 (GLIBC 2.35) |\n\nAll releases live at [github.com/RobiMez/loadcell/releases](https://github.com/RobiMez/loadcell/releases).\n\n### macOS Gatekeeper\n\nThe binary isn't notarized yet, so the first launch shows\n*\"cannot be opened because the developer cannot be verified.\"* Either:\n\n```bash\n# Right-click → Open works too, but this is one command:\nxattr -dr com.apple.quarantine /Applications/loadcell.app\n```\n\nOr right-click `loadcell.app` → **Open** → confirm in the dialog. After the\nfirst launch, macOS remembers your choice.\n\n---\n\n## Build from source\n\nThree commands. Requires [Go 1.22+](https://go.dev), [Node 20+](https://nodejs.org),\nand the [Wails CLI](https://wails.io).\n\n```bash\n# 1. Install the Wails CLI\ngo install github.com/wailsapp/wails/v2/cmd/wails@v2.12.0\n\n# 2. Clone \u0026 enter the repo\ngit clone https://github.com/RobiMez/loadcell.git\ncd loadcell\n\n# 3. Run in dev mode...\nwails dev\n\n# ...or build a redistributable\nwails build\n```\n\nOn Linux you'll also need GTK/WebKit headers:\n\n```bash\nsudo apt install libgtk-3-dev libwebkit2gtk-4.0-dev build-essential pkg-config\n```\n\n---\n\n## Project layout\n\n```\n.\n├── app.go                  # Wails-bound surface (StartTest, ListRuns, SendSample…)\n├── engine/\n│   └── engine.go           # The load-test engine — worker pool, scheduler, aggregator\n├── runs.go                 # Run persistence (JSON under UserConfigDir)\n├── requests.go             # Saved-request CRUD\n├── sample.go               # Single-shot \"Send\" handler\n├── frontend/\n│   ├── src/App.svelte      # Everything UI (curve editor, chart, sidebar, info sheet)\n│   └── wailsjs/            # Auto-generated TS bindings to the Go side\n├── tools/\n│   └── echo-server/        # Tiny Express target with verb-varied error mixes\n├── site/                   # Landing page (GitHub Pages)\n├── build/                  # App icons + Wails build artefacts\n└── .github/workflows/      # Release + Pages CI\n```\n\nThe Go engine and the Svelte UI talk over Wails' generated bindings\nplus a single `metrics` event for the live tick. Everything else\n(saved requests, saved runs, sample responses) is request/response.\n\n---\n\n## Try the bundled test server\n\nThere's a small Express server in `tools/echo-server/` with nine routes\nthat return distinctly different status mixes and latency profiles —\nperfect for seeing what each chart shape looks like.\n\n```bash\ncd tools/echo-server\nnode server.js\n# echo-server listening on http://127.0.0.1:4466\n```\n\nThen point LoadCell at any of:\n\n| Route | Profile |\n|---|---|\n| `GET /health` | 99% 2xx, fast (1–3 ms) |\n| `GET /users` | 95% 2xx, occasional 5xx, modest tail |\n| `POST /users` | 70% 2xx, 20% 422, 10% 5xx (validation-heavy) |\n| `POST /login` | 60% 2xx, 35% 401, 5% 429 (auth-heavy) |\n| `GET /products/search` | 90% 2xx, 8% 429, slow tail to 300 ms |\n| `POST /checkout` | 50% 2xx, 30% 402, 15% 5xx, 5% 429 (messy) |\n| `GET /reports/heavy` | 95% 2xx but 200–500 ms baseline |\n| … | …and more in [`tools/echo-server/server.js`](tools/echo-server/server.js) |\n\n---\n\n## License\n\n[GPL-3.0](LICENSE) — same spirit as the tools LoadCell is meant to keep\nhonest. Fork it, modify it, ship it — just keep it open.\n\n---\n\n## Sponsor / built by\n\nLoadCell is free, open source, and built by [Robi](https://robi.work) in\nbetween a couple day jobs. If it saves you time, a small sponsorship\nhelps fund more Claude tokens \u0026 food (in that order):\n\n[![Sponsor on GitHub](https://img.shields.io/badge/Sponsor-on%20GitHub-c44d4d?style=for-the-badge\u0026logo=githubsponsors\u0026logoColor=white)](https://github.com/sponsors/RobiMez)\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frobimez%2Floadcell","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Frobimez%2Floadcell","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frobimez%2Floadcell/lists"}