BrowserBash - English Descriptions to Browser Tests

Turn English into browser tests. AI agents prove your code works.

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Updated Jul 2026 · Added Jul 2026

browserbash.com

Ai Test GenFreeai-test-gen

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What is Browserbash?

BrowserBash converts plain-English test descriptions into automated browser tests without requiring selectors or code. It uses AI to drive a real Chrome browser and returns machine-readable verdicts via MCP or NDJSON, making it ideal for AI agents validating code changes. The tool runs locally with free models (Ollama), requires no API keys, and is open source under Apache-2.0.

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Key Features of Browserbash

Plain English test descriptions
Real Chrome browser automation
No selectors or code required
MCP server integration
NDJSON event streaming
Deterministic assertions
Replay cache for warm runs
Video recording and per-run replays
Budget controls for test suites
Open source CLI

Who Should Use Browserbash?

AI agents validating code changes

Automated end-to-end testing without selectors

CI/CD pipeline integration for coding agents

Data extraction and scraping

Dashboard and feature validation

Checkout flow testing

Browserbash: Pros & Cons

✓Pros

100% free forever for CLI
No API keys required
Works with free local models (Ollama)
Open source (Apache-2.0)
Deterministic results with clear pass/fail verdicts
Replay cache eliminates token waste on green tests
Built-in MCP server for seamless agent integration
Cost tracking per run and suite budgets
Works with any MCP host (Claude, Cursor, Codex)
Structured JSON output for programmatic consumption

Frequently Asked Questions about Browserbash

What is BrowserBash?

BrowserBash is a tool that converts plain-English test descriptions into automated browser tests. You describe what you want to test in one sentence, and it drives a real Chrome browser to execute it, returning a machine-readable verdict.

Do I need API keys or a credit card?

No. BrowserBash is 100% free with no API keys required. It works with free local models like Ollama and requires no credit card.

How does it integrate with AI agents?

BrowserBash includes a built-in MCP server that plugs into any MCP host like Claude, Cursor, or Codex with one line. Your coding agent gets three tools: run an objective, run a test file, and run a whole suite.

What format are the test results?

Results are returned as structured JSON objects with status, summary, extracted values, and assertion results. You can also use --agent to stream NDJSON events, and exit codes (0/1/2/3) for shell agents.

How does the replay cache save tokens?

The replay cache re-runs green tests with zero model calls, so agents can validate changes after every edit without burning tokens on passing tests.