Zen is a free, self-hosted notes app that keeps standard Markdown notes in a local SQLite database with instant full-text search and tag organization. It serves individuals who want a minimal, keyboard-friendly writing space on infrastructure they control rather than another hosted workspace. This assessment rests on public official sources only; no original user review was inspected within this draft's research budget.[1][2]
Quick verdict
Zen suits individuals who want the smallest possible path to self-hosted Markdown notes on a server they control. Its decisive capability is standard Markdown in a local SQLite database with tag organization and BM25 full-text search, delivered as one Go binary or Compose file under AGPL-3.0. Its material constraints are single-user scope with no documented SSO or managed hosting, plus the author's stated limited review bandwidth.[1][2][3]
Key features
Deployment is a single Go binary or one Docker Compose file with low resource use, so Zen runs on modest self-hosted hardware without a complex stack.[1]
Notes are standard Markdown stored in a local SQLite database with no proprietary format, which keeps content portable and readable outside the app.[1][2]
Organization uses flexible tags with custom Focus Modes instead of rigid folders, shown across list, board, kanban, and calendar layouts.[1][2]
Search is full-text with BM25 ranking across all notes, with experimental semantic search for notes and images available through a companion service.[1]
Portability is built in: import and export with full data portability, note version history, pinned notes, archive with soft delete, and automated backups plus imports from other services via companion tools.[1]
Daily use is covered by offline reading and editing, a PWA install option, dark mode, keyboard shortcuts, and a Markdown toolbar with WYSIWYG editing.[1][2]
An MCP surface exposes searching, listing, and reading notes to AI apps, and an experimental canvas offers spatial organization of notes and images.[1]
Who will love it
Solo writers who want minimal Markdown notes with zero vendor lock-in will love Zen, since standard Markdown in local SQLite keeps every note accessible forever.[1][2]
Self-hosters who want one binary or one Compose file on modest hardware will love Zen, since the documented install avoids databases, queues, and managed dependencies.[1]
Keyboard-driven organizers who prefer tags over folders will love Zen, since Focus Modes, shortcuts, and tag organization replace notebook hierarchies.[1][2]
Who should avoid it
Teams needing shared workspaces, roles, or single sign-on should avoid Zen: no multi-user, sharing, or SSO capability is documented, and the author describes it as a personal project.[1][2]
Buyers wanting a managed option should avoid Zen: no hosted cloud is documented, so operating, updating, and backing up the instance is the adopter's job.[1][2]
Organizations sensitive to copyleft should review carefully: Zen is AGPL-3.0, whose network clause requires sharing modified source with users of a hosted instance.[1]
Alternatives and compatibility
Memos is the closest published alternative: both are self-hosted Markdown note tools with tags and search, where Zen takes the minimal single-binary SQLite side and Memos takes timeline quick capture with per-memo link sharing.[1][2][3]
Switching costs stay low on the way out: standard Markdown storage with import, export, and a dedicated import tool means notes move without a proprietary-format migration.[1][2]
Questions worth asking
Is Zen free?
How do I install Zen?
Build and run the single Go binary, or deploy with Docker Compose. Both paths are documented in the repository README, and the design targets low resource use, so modest hardware is enough.[1]
Where does Zen store my notes?
What is the best Zen alternative for quick capture?
Both are self-hosted Markdown note tools with tags and search. Zen is the more minimal pick: a single binary with SQLite storage and tag-based organization instead of folders. Memos remains the better pick for timeline-style quick capture with per-memo link sharing. Anyone needing multi-user collaboration should look past both.[1][2][3]
Sources and editorial review
Source research. Reviewed on October 13, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.
We have not run or tested this product.
- sheshbabu/zen repository
official · Observed October 13, 2026
Repository README: identity, features, install paths, storage model, search, portability, experimental MCP and canvas, personal-project maintenance note.
- sheshbabu/zen license
official · Observed October 13, 2026
Full license text confirming AGPL-3.0 licensing of the Zen codebase.
- Zen official site
official · Observed October 13, 2026
Official marketing and features page: minimal writing space, layouts, tags with Focus Modes, offline scope, free self-hosted positioning, demo link.
- openalternative.co zen directory entry
published measurement · Observed October 13, 2026
Directory lead (discovery only): category, tags, license, self-hosted flag, repository link, and recency signals used to corroborate official sources.
- Memos official site
official · Observed October 13, 2026
Published incumbent used only for the competitor edge: open-source self-hosted Markdown notes with tags, search, and Docker install.
Compared with these products
No explicit proprietary baseline is recorded.