# antithesishq/bombadil

Property-based testing for web and terminal UIs

Repository: https://github.com/antithesishq/bombadil
Canonical: https://ross.abutalabs.com/products/bombadil
Homepage: https://antithesishq.github.io/bombadil/
Language: Rust
License: MIT
License Family: permissive
Topics: antithesis, pbt, playwright, property-based-testing, testing, ui, web
Last push: 2026-08-26T09:16:13+00:00

## Health v2 (maintenance only)
Score: 83/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 99, longevity 18
- inputs: {"age_days": 259, "days_push": 7, "days_rel": 9, "gap_med": 7, "n_releases_24m": 16}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1444, forks 52 (observed 2026-08-28T04:04:44.103401+00:00)

## What it is
Bombadil is a property-based testing tool for web and terminal UIs that autonomously explores and validates correctness properties. It is built in Rust by Antithesis and runs locally, in CI, and inside Antithesis.

## Use cases
- property-based testing for web UIs
- fuzz my browser app for bugs
- test terminal UI correctness properties
- find UI bugs automatically in CI
- generate random UI interactions to validate invariants

## When to choose
- you want property-based testing for browser or terminal UIs
- you need autonomous exploration to find hard UI bugs
- you already use Playwright and want PBT on top

## When to avoid
- you need a stable 1.x API since it is on 0.x and may change
- you only need simple deterministic unit tests
- you need non-UI property-based testing

## Facets
- artifact type: library
- maturity: experimental
- function: testing, e2e-testing, fuzzing
- domain: testing, web-development, developer-tools
- platform: cross-platform, cli, browser
- tags: property-based-testing, playwright, terminal-ui, ui-testing

## Member repositories
- antithesishq/bombadil (main) score 83

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:44.103401+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:36:17.391564+00:00, confidence not recorded.
  - readme: https://github.com/antithesishq/bombadil (fetched 2026-08-28T04:04:44.103401+00:00, sha f33573f704a4)
  - homepage: https://antithesishq.github.io/bombadil/ (fetched 2026-08-29T11:46:14.325305+00:00, sha 66353eb330b0)
- Data as of 2026-08-30T08:39:29.467469+00:00.