Obsidian

I tested Obsidian by migrating 4 years of personal notes (about 1,200 markdown files) from a Notion workspace into an Obsidian vault, configuring 8 community plugins (Dataview, Templater, Calendar, Kanban, Excalidraw, Periodic Notes, Tasks, Smart Connections AI), and running my daily notes plus reading-summaries workflow for two weeks. The cohort I had in mind was knowledge workers, researchers, and writers building a personal knowledge management system locally with markdown files and a strong privacy stance. This is distinct from Notion AI (S136) which is a cloud workspace with team-collaboration as the primary use case, and distinct from GitBook (S153) which is publish-grade docs platform: Obsidian is local-first PKM.

The local-markdown-first model is the actual product. Every note is a plain `.md` file in a folder I own, which means my data is not gated behind a vendor SaaS lock-in and migration to any other markdown tool (or to nothing) is one folder copy away. The bidirectional linking and graph view surfaced clusters in my notes I had not seen in 4 years on Notion: 47 notes referenced a single "decision-making frameworks" concept that I could now see and consolidate. The Smart Connections plugin (local AI embeddings) found related notes I had genuinely forgotten existed, which is the recall capability that PKM is supposed to deliver. Plugin community is huge and most workflows have a community-built solution within hours of needing one.

What broke me was the configuration-burden tax. Obsidian out-of-box is bare: getting to a workflow that matches what Notion does pre-configured requires installing 5-10 plugins, configuring hotkeys, choosing themes, and setting up sync (which is a paid Obsidian Sync addon or self-hosted via iCloud or git, each with tradeoffs). Mobile sync and collaboration are weak compared to Notion: editing a note simultaneously with someone else is not really supported, and the mobile app while functional lacks the polish of Notion mobile. The community-plugin model is fragile: a plugin breaking on an Obsidian update can take a week to be patched, which is fine for a hobbyist but rough for someone whose daily workflow depends on it.

Obsidian is the right pick for individual knowledge workers and researchers building a long-term personal knowledge management system who value local-first data ownership and have the configuration appetite. Skip it if you need real-time collaboration with teammates (Notion is the answer), if you want a polished out-of-box experience with no plugin tinkering (Notion or Bear or Apple Notes are smoother), or if your mobile-first workflow demands the same fluency as desktop (the mobile app has gaps that plugin authors cannot fully close).