Turn lectures into a searchable study system.
Capture notes, files, and recordings in one private workspace, transcribe lectures locally or live, search with hybrid retrieval, and use a Claude-key assistant when you want AI help.
Not just storage. A tool-aware study system.
Lumen turns your workspace into retrievable context: local transcripts, semantic chunks, service-layer tools, MCP access, and an in-app assistant when you add your Claude API key.
Local capture
recordings, notes, files
Hybrid retrieval
full-text + semantic chunks
MCP tools
same contract in-app and external
Claude assistant
enabled with your API key
From lecture capture to grounded answers.
Lumen keeps the workflow direct: capture the raw material, make it searchable, then retrieve the exact context you need.
Capture
Drop in readings, lecture recordings, files, and notes — organised in nested folders from day one.
Transcribe
Run batch transcription on your machine or capture live text in the browser, then finalize into the same transcript path.
Retrieve and reason
Search lexically and semantically, then ask the Claude-key assistant to work through your own MCP-backed study tools.
Built for the messy middle of real study.
Lectures, files, transcripts, search, and AI assistance all work from the same user-scoped workspace instead of becoming another pile of disconnected exports.
One library for the whole course
Nest folders, notes, files, recordings, transcripts, and tags together instead of scattering study material across five tools.
Notes built for recall
Write structured study notes with headings, lists, tables, and links, then keep them beside the lecture evidence they came from.
Local and live transcription
Upload recorded audio for batch transcription, or capture live sessions in the browser. Audio processing stays local by design.
Hybrid search over everything
Combine full-text search with semantic retrieval across notes and transcript chunks, so the answer can surface even when you remember the idea, not the wording.
Assistant over your workspace
Ask about notes, transcripts, documents, and tags through the same MCP tool contract exposed to external hosts.
Bring your Claude key
AI inference currently runs with your own Claude API key. Lumen stores it server-side, encrypted at rest, and the key is never shown again.
Build a study workspace you can actually ask questions of.
Your notes, recordings, transcripts, and retrieval tools stay organized together. Add your Claude API key when you want AI assistance over that workspace.
Get started