Advanced search controls
Set the rules for relevant results. Filters and ranking controls help match each query with the right information.
Search that self-improves.
Fast, accurate product and file search. Offload tuning without losing control. Always in sync with your sources.
Backed and used by
One platform
for ranked results.
Powerful infrastructure for search and ingestion.
01Search
Search
Find the right result for each query. Keep ranking and filters aligned with your goals.
01Search
Search
Find the right result for each query. Keep ranking and filters aligned with your goals.
01Search02Iterate03Process04Engine05Sync
Sync information and self-improve search.
Every layer above ships together, on one index. Nothing to wire and nothing to keep aligned.
How it worksConnect your data.
Connect your data.
Improve results.
Link agents with our hosted MCP.
MCP source codeclaude mcp add --transport http captain https://mcp.captain.dev/mcp \ --header "Authorization: Bearer cap_..."
Case studyBuilt for teams that
Built for teams that
depend on every answer.
Used by Y Combinator, compliance teams, and engineers building agents that need reliable answers.
Alan Yao
Co-Founder & CTO, AthenaHQThe accuracy was noticeably better. Setup took 5 minutes, and it scaled to thousands of docs a day.
View the post on LinkedIn
Garry Tan
President & CEO, Y CombinatorCaptain is a step function increase in capability compared to out-of-box RAG pipelines.
View the post on LinkedInFile search benchmarksYour data is
Your data is
the benchmark.
Public benchmarks are a starting point. What matters is how well search works with your data and the goals you set. Run with Captain’s MCP to measure retrieval and compare changes against your accuracy or latency target.
Coverage: queries answered
Captain100%
Gemini File Search~66%
When evaluated against other leading file-search APIs on production queries, alternatives fail to answer about one in three questions.
+43%
Higher accuracyvs leading alternatives · BEIR nDCG@10
108×
Faster indexing18 hrs to 10 min
7.5×
Faster search1,500ms to 100ms
Observability01
Usage insights
See what people search for, and exactly where answers fall short. The feedback loop makes retrieval better over time.
Observability02
Knowledge gap discovery
See the questions your data has yet to answer, surfaced automatically, so you know exactly where to close the gaps.
Observability03
Retrieval attack detection
Catch black-hole vector attacks (arXiv:2604.05480) before they reach production, a failure mode most DIY search layers never fix.
Why captainSearch improves.
Search improves.
You stay in control.
Agent-managed search tuning
Captain’s AI agents identify search problems and test improvements using your business data and search activity. Your team stays in control.
Connected to your business
Use your business information to give search the context behind a query. Keep results connected to the goals your team is working toward.
PII masking for sensitive data
Opt-in PII masking redacts sensitive information when your files are indexed, so it can be hidden from your AI agents.
Your search stack:
self-improving
File search
Captain File Search
Our famous file search API.
Point it at your files and search them. Parsing, embeddings, vector DB and evaluation, all managed for you.
OCREmbedVector DBEvals
File search evaluation
Captain Evals
Evaluate and tune your file search.
Call captain_eval from the hosted MCP server and it scores retrieval on evals written from your own files, then tunes toward the accuracy or latency target you set.
InspectEvalTuneReview
File sync
Captain Sync
Bucket change notifications drive the index in near real time, and scheduled reconciliation jobs sweep for anything a notification dropped.
Your buckets remain the source of truth.
S3R2GCSSupabaseBackblazeTerraform
File parsingMake complex files
Make complex files
easy to search.
Search content inside scanned documents, tables and recordings without building a parsing pipeline.
DOCX
XML fragments in a zip, with tables that only exist as formatting. Captain's parser was tuned on the ugliest DOCX files our customers could find.
PDF
Clean PDFs parse anywhere. Captain also reads the rotated scan and the handwritten margin note.
Video + audio
Transcribed, described and indexed at ingest. The chart on slide 12 is a query, not a scrubbing session.
Enterprise-grade
by default.
Security
TLS in transit and encryption at rest protect your data. Opt-in PII masking helps keep sensitive file content out of search results.
