Focused Tool · Apache 2.0 · Single Binary · Developer Tools

Self-hosted A/B testing engine

Define experiments, split traffic, collect results, calculate statistical significance. Optimizely starts at $50K/yr. This is a binary and a dashboard.

Install Crucible Free Complete — all 150 tools $29/mo

Full REST API

Every operation in Crucible is available through a JSON REST API. No SDK required — use curl, fetch, or any HTTP client.

A solo developer built a weekend project that needed test runs tracking. Instead of spinning up Postgres and writing an admin panel, they added Crucible as a sidecar process. The REST API covered every operation the project needed. Development time saved: roughly a full day.

The problem

Every testrun your team creates contains context that matters — name, suite, passed, failed, skipped. When that data lives in a third-party service, you are one acquisition or policy change away from losing access. Crucible keeps it local.

Endpoints
How Crucible runs

The data model stores each testrun with 7 fields: name, suite, passed, failed, skipped. All fields are queryable through the search API. The dashboard renders test runs as cards with color-coded status indicators and inline metadata. Creating, editing, and deleting records is immediate — no save-and-deploy cycle.

Optimizely at $50,000/yr.

Self-hosted A/B testing engine. Self-hosted on your infrastructure. Your data never leaves your server.

Quickstart

Running in under a minute.

Download
curl -fsSL https://stockyard.dev/install.sh | sh -s -- --tool crucible
Run
PORT=9650 ./crucible
Open
http://localhost:9650

Single binary. Embedded SQLite. No Docker. No database. No dependencies.

Pricing

Free to start. Pro when you need it.

Free
$0
forever
  • 2 experiments
  • Single binary, embedded SQLite
  • Apache 2.0 — modify freely
Pro
$0.99
per month
  • Unlimited experiments, traffic splitting, significance calculator, export
  • License key, no cloud dependency
  • Email support

License key by email. One env var.

Your license key arrives by email within 5 minutes of checkout. Set it as an environment variable and restart the binary.

export CRUCIBLE_LICENSE_KEY=stockyard_xxxxxxxxxxxxxxxxxxxx
./crucible

No cloud connectivity required. The binary validates the key offline with Ed25519 signatures.

Part of the Stockyard family — 150 focused self-hosted tools · Complete bundle $29/mo · stockyard.dev