Head to head · Productivity · updated Oct 25, 2026
Obsidian vs NotebookLM
Obsidian scores 58 to NotebookLM's 17 on public evidence for AI notes & second brain, and they rank #1 and #4 there. Both are free to start. Numbers below are the same public signals the ranking uses, recomputed nightly — nothing here is sponsored.
Obsidian
A local-first Markdown knowledge base with a large community plugin ecosystem, including AI chat, embeddings and generation plugins.
+ Your notes are plain files you own, and plugins like Copilot and Smart Connections let you chat with your vault using any model, including local ones.
− AI features require configuring third-party plugins and API keys yourself.
NotebookLM
A grounded research notebook that answers only from the sources you upload and can turn them into Audio Overview podcasts.
+ Answers are grounded strictly in your uploaded PDFs, Docs, URLs and YouTube videos with citations, and Audio Overviews turn them into a two-host podcast.
− Sources are capped per notebook and the free tier limits daily queries and audio generations.
Side by side
public evidence| Obsidian | NotebookLM | |
|---|---|---|
| Evidence score / 100 | 58 | 17 |
| GitHub stars | closed source | closed source |
| Hacker News stories, 30d | 25 | 1 |
| Release-feed mentions, 30d | 3 | 0 |
| Last activity | 3 days ago | – |
| Pricing | Free; Sync $4/mo | Free tier · Free; NotebookLM Plus via Google AI Pro $19.99/mo |
| Platforms | mac, windows, linux, ios, android | web, ios, android |
| Maker | Obsidian (Dynalist Inc.) |
Which one?
Pick Obsidian if
- you want the stronger public evidence (58 vs 17)
- you need it on linux, mac, windows
Best for a private, pluggable second brain.
Pick NotebookLM if
- you need it on web
Best for studying a fixed set of documents.