Privacy Policy

Last updated: April 22, 2026

Faultlines is a CLI and web app that maps your codebase into features using git history. This page describes what we collect, how we store it, and how to delete it. Plain language, no legalese where avoidable.

1. What we collect

• Waitlist form: your email address and (optionally) a public repository URL you submit. We use this to send you scan results and launch updates.
• Account signup: email, hashed password, and (if you use OAuth) your GitHub or Google profile name and avatar. Managed by Better Auth.
• Product analytics: PostHog records page views, button clicks, and sign-up funnel events to help us improve the product. IP addresses are truncated.
• MCP usage logs (local only): the Faultlines MCP server writes query-level logs to~/.faultline/mcp_usage.db on your machine. This is never transmitted to us unless you explicitly enable cloud sync (currently alpha, not in public beta).

2. What the CLI does not send

The Faultlines CLI runs locally. It reads your git history and files, producesfeature-map.json on your disk, and exits. It does not upload your source code, file contents, or commit data to any server. The only outbound network calls are to:

• Your chosen LLM provider (Anthropic or your local Ollama endpoint) if you pass--llm.
• PostHog or Sentry — only if you explicitly pass their API keys via --posthog-key or--sentry-token.

3. How we store data

• Waitlist entries and user accounts are stored in a PostgreSQL database hosted on Vercel infrastructure (Neon or equivalent Marketplace provider). Encrypted at rest.
• We do not sell your data and do not share it with third parties outside the infrastructure providers listed above (Vercel, PostHog, OAuth providers).

4. How to delete your data

Emailhello@faultlines.dev from the address on your account and we will delete all associated records within 7 days. If you used the waitlist form only, a single email with the subject "delete my waitlist entry" is enough.

5. Cookies

We use strictly necessary cookies for session management (Better Auth). PostHog sets a first-party analytics cookie. No third-party ad tracking.

6. Children

Faultlines is a developer tool not intended for users under 16. We do not knowingly collect data from children.

7. Changes

If we materially change this policy, we will update the "last updated" date above and, for registered users, email the address on file. This page is the source of truth.

8. Contact

Questions about privacy:hello@faultlines.dev.