facebookarchive/planout

Health v2 · maintenance only

Flags: no_releases archived no_license

Adoption not part of the score

1688 stars · 217 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

PlanOut is a framework and domain-specific language for online field experimentation, letting developers define how units (e.g., users) are deterministically mapped to experiment conditions via hashing. It ships a Python reference implementation plus interpreters and SDKs for Java, JavaScript, and PHP, along with a web-based editor and compiler.

Use cases

• run A/B tests on button colors and text
• randomly assign users to experiment variants deterministically
• manage multiple mutually exclusive experiments with namespaces
• log experiment assignment data for analysis
• execute serialized experiment scripts written in the PlanOut DSL
• run controlled online field experiments at scale

When to choose

• you need deterministic, hash-based random assignment of users to experiment conditions
• you want a lightweight self-hosted alternative to hosted A/B testing platforms
• you are a researcher or small business running online experiments
• you need cross-language experiment assignment (Python, Java, JavaScript, PHP)

When to avoid

• you need a maintained project with active support and updates
• you want a full-featured hosted experimentation platform with dashboards and statistical analysis
• you require multi-armed bandit or adaptive experimentation out of the box
• your stack has no PlanOut SDK available

Facets

library · maturity maintenance

testing sdk developer-tools analytics developer-tools data-science python jvm php cross-platform a-b-testing experimentation field-experiments randomized-assignment deterministic-hashing abandoned nodejs

Member repositories

For agents

markdown · JSON · MCP: product_card(name="facebookarchive/planout")