# Captain > Search that self-improves. Fast, accurate product and file search. Offload tuning without losing control. Always in sync with your sources. Captain is one platform: a managed file search API (v3), the `captain_eval` MCP tool (which writes evals from your own files and tunes retrieval toward the accuracy or latency target you set), Captain Sync for event-driven bucket sync (S3, R2, GCS, Supabase, Backblaze), an open source MCP server, and opt-in PII masking at index time. Free tier: 500 indexing credits a month, then $0.02 a credit. Docs at https://docs.captain.dev. Support: humans@captain.dev. Full site text: https://captain.dev/llms-full.txt. This file is hand-edited. llms-full.txt is generated from the rendered site (see frontend/runcaptain/scripts/generate-llms-full.mjs). ## Site - [Product Search](https://captain.dev/join): Keep your existing search. Captain connects your business context, tests improvements, and rolls out what works. If revenue per visitor does not improve, you do not pay. Request an invitation to discuss your store and a first test with our team. - [Home](https://captain.dev/): Search that self-improves. Platform overview, how it works, MCP install, parsing, benchmarks, why Captain, products, security. - [Pricing](https://captain.dev/pricing): 500 free indexing credits a month, then $0.02 a credit. Credits per unit vary by file type (text 0.5 per 3,000 characters rounded up per file, basic pages 1, advanced 2.5, spreadsheets 0.5 per 3,000 characters of indexed table text, images 0.5, audio 5 per minute and video 20 per minute billed by the second, email bodies at the text rate plus each attachment at its own rate, copy collection 10). No per-seat pricing. Scale and Enterprise tiers, credit table, and FAQ. - [Book a demo](https://captain.dev/book-a-demo): Tell us what you're building and see how teams like yours use Captain. - [Security](https://captain.dev/security): What happens to a file you index: encrypted in transit and at rest, tenant isolation, subprocessors, and how to reach the security team. ## Products - [File Search](https://captain.dev/#products): For agents, RAG, and bucket-based workflows. - [Product Search](https://captain.dev/join): For online stores, and on-site catalog discovery - [File Search API](https://docs.captain.dev/guides/advanced-querying): The v3 query API. Index files, then query with natural language and get back ranked chunks with citations, metadata filters, semantic ratio tuning, boosts and chunk relations. - [Captain Evals](https://docs.captain.dev/guides/mcp/evaluate-and-tune): The `captain_eval` MCP tool. Evaluate and tune your file search. Inspects your retrieval stack, writes hundreds of Q&A evals from your own files, and tunes toward the target you set. - [Captain Sync](https://docs.captain.dev/guides/sync/set-up): Bucket change notifications drive the index in near real time; scheduled reconciliation sweeps for anything a notification dropped. S3, R2, GCS, Supabase, Backblaze, Terraform. - [MCP server](https://github.com/runcaptain/captain-mcp): Link agents with our hosted MCP. Open source. Add Captain to Claude Code, Codex, Cursor, GitHub Copilot, Devin, or any MCP client at https://mcp.captain.dev/mcp. - [PII masking](https://docs.captain.dev/guides/pii-masking): Redact sensitive customer data at index time with one flag, before it reaches your models or logs. ## Docs - [Documentation](https://docs.captain.dev/guides/quickstart): Quickstart, API reference, CLI, sync, MCP, and PII masking. - [Changelog](https://docs.captain.dev/changelog): What shipped, by date. ## Blog - [Blog](https://captain.dev/blog): Field notes on retrieval from the team building Captain. - [Edge Routing for RAG](https://captain.dev/blog/edge-routing): Serving international customers on low latency semantic search. - [Copy Collections](https://captain.dev/blog/copy-collections): One API call duplicates a collection's documents, chunks, embeddings and custom metadata under a new name, reusing the index you already built. - [Migrating from Ragie to Captain](https://captain.dev/blog/ragie-to-captain-migration): Ragie's hosted service ends July 19, 2026. How Ragie customers move their applications to Captain. - [Captain v2 API Launch](https://captain.dev/blog/captain-v2-launch): The stable release of the v2 API and the product updates that shipped with it. - [RSS feed](https://captain.dev/blog/rss.xml): Subscribe to new posts. ## Company - [Open source](https://github.com/runcaptain): Captain's public repositories, including the MCP server. - [LinkedIn](https://linkedin.com/company/runcaptain): Captain Technologies, Inc. Backed by Y Combinator. - [Support](mailto:humans@captain.dev): Email a human. ## Optional - [Privacy policy](https://captain.dev/privacy-policy): What personal data Captain collects, why we hold it, who else can see it, how long we keep it, your rights, and regional website analytics and privacy choices. - [Terms of use](https://captain.dev/terms-of-use): Plans and credits, payment, acceptable use, ownership, availability, liability, and termination. - [Trust center](https://trust.runcaptain.com): SOC 2 Type II, GDPR, HIPAA documentation.