#1
Logseq
Best for PKM / Roam-styleAGPL-3.0Self-host~35kOutliner-based PKM (personal knowledge management) with bidirectional links, daily journaling, graph view.
github.com/logseq/logseqAll best-of guides
Notes / Knowledge base · open-source ranking
Best Open-Source Notes / Personal knowledge in 2026
Evernote, Notion, Apple Notes — all lock your data into proprietary formats. The best open-source notes apps in 2026 use plain Markdown files you own forever, with sync, mobile apps, and powerful linking.
#1 Pick — Best for PKM / Roam-style
Logseq
Outliner-based PKM (personal knowledge management) with bidirectional links, daily journaling, graph view.
github.com/logseq/logseqAll 4 ranked
#2
SiYuan
Most feature-richAGPL-3.0Self-host~22kNotion + Roam hybrid with block editor, kanban, mind map. Local-first, can sync via WebDAV.
github.com/siyuan-note/siyuan#3
Notesnook
Best for privacy / E2EEGPL-3.0Self-host~13kEnd-to-end encrypted notes (zero-knowledge). Apple Notes-like UX, fully OSS, free sync.
github.com/streetwriters/notesnook#4
Standard Notes
Audited E2EEAGPL-3.0Self-host~6kMinimalist E2EE notes app. Cross-platform sync. Audited security. Free tier covers basic use.
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