TL;DR

What it is: Open-source (MIT), self-hosted note-taking tool built for quick capture. Think Twitter’s timeline interface, but private, on your server, storing notes in Markdown.
Who it’s for: Self-hosters who want a frictionless place to dump quick thoughts, links, code snippets, and daily logs. Not a full knowledge base — a micro-journal.
Cost savings: Notion Personal starts at $0 but upsells to $10/month for teams. Obsidian Sync is $4-8/month. Memos is free, runs on a $3/month VPS or a Raspberry Pi, forever.
Key strength: Radical simplicity. One Docker command, ~20MB image, instant capture from a timeline-first UI. No folders, no hierarchy, no onboarding. Open, type, done.
Key weakness: No offline access, no folder hierarchy (tags only), no real-time collaboration, search isn’t fuzzy. It’s intentionally minimal — if you need Obsidian’s power, this isn’t it.

What is Memos

Memos is a self-hosted note-taking app designed for one thing: capturing thoughts fast. The GitHub description says “open-source, self-hosted note-taking tool built for quick capture. Markdown-native, lightweight, and fully yours.” That’s accurate and complete — there’s nothing hidden behind that description.

The interface looks like a private Twitter feed. You open the app, type in a text box at the top, hit save. Your note appears in a reverse-chronological timeline. You scroll through your history like a social feed. Notes use Markdown, can include tags (hashtags within the text), attachments, code snippets, links, and checklists. There’s a calendar view showing when you wrote things and a search bar for finding them later.

The technical design is equally minimal. Memos is a single Go binary, ships as a ~20MB Docker image, and stores everything in SQLite by default (with MySQL and PostgreSQL options). One command deploys it. 57,000+ GitHub stars, 370+ contributors, 8.5M+ Docker pulls, MIT licensed.

What Memos is not: it’s not Notion (no databases, no project management), not Obsidian (no graph view, no plugins, no backlinks), not Standard Notes (no end-to-end encryption). It’s a scratchpad. A place for thoughts to land before they disappear. Several users report using Memos alongside Obsidian — Memos for daily capture, Obsidian for long-form knowledge management.

Why people choose it over Notion, Obsidian, and Google Keep

The five reviews converge on one theme: Memos wins on speed of capture and simplicity of deployment, and loses on everything else.

Versus Notion. One XDA reviewer puts it bluntly: “Forget Notion and Obsidian, this self-hosted note-taking tool is my new favorite.” The argument isn’t that Memos does more than Notion — it does far less. The argument is that Notion’s features get in the way of quick notes. You open Notion, navigate to a page, pick a template… by the time you’re ready to type, the thought is gone. With Memos, you open the app and type. The privacy angle matters too: Memos runs on your server, Notion runs on theirs.

Versus Obsidian. This is the more nuanced comparison. Obsidian is a local-first knowledge management powerhouse with graph views, backlinks, 1,000+ plugins, templates, and daily notes. It’s for building a “second brain.” Memos is for jotting down “refactor auth — finally” before you forget. The community consensus: “Obsidian is for building a second brain. Memos is for writing quick thoughts before they disappear.” Many users run both.

Versus Google Keep. Google Keep is free and syncs across devices, but your notes live on Google’s servers. Memos gives you the same quick-capture experience with data sovereignty. Several reviewers specifically praise the timeline interface as more natural than Keep’s card layout.

Features: what it actually does

Core capture:

Timeline-first UI — open, write, done. No folder navigation
Markdown-native editing with code blocks, checklists, links, attachments
Hashtag-based tagging within note text (#dev, #ideas, #daily)
Full-text search across all notes
Calendar view showing when notes were created
Pin important notes to top of timeline

Data ownership:

Self-hosted on your infrastructure
SQLite (default), MySQL, or PostgreSQL backends
Single database file (SQLite) — trivial to backup
Zero telemetry, zero tracking
MIT license — truly open source

Sharing and social features:

Notes can be private or public
Shareable links and embeddable iframes
Multi-user support (register new accounts, disable signups)
Emoji reactions on notes

API and integrations:

Full REST and gRPC APIs
iOS Shortcuts integration via API for quick capture
Browser-based Scratchpad that syncs to your Memos instance
Third-party iOS apps available

Deployment reality check

Memos is one of the easiest self-hosted tools to deploy.

docker run -d --name memos -p 5230:5230 -v ~/.memos:/var/opt/memos neosmemo/memos:stable

Open http://localhost:5230. Create your account. Start writing. That’s it.

All notes and images are packed into a single SQLite db file. This makes it super easy to backup and restore elsewhere.

What you actually need:

Any machine that can run Docker (VPS, Raspberry Pi, old laptop, NAS)
Virtually no RAM — Memos is negligible in resource usage
Port 5230 open (or reverse proxy with your domain)

What can go sideways:

No offline access. If your server is down, you can’t read your notes. This is a dealbreaker for some people.
SQLite database can grow and not shrink after deleting notes — run the VACUUM operation periodically.
Search isn’t fuzzy — you need to remember exact words.
Mobile web experience is good but not native-app quality. Third-party iOS apps exist but quality varies.
No backup automation built in — you need to set up your own cron job to copy the SQLite file.

Realistic time estimate: 3-5 minutes from zero to working instance. If you’ve used Docker before, closer to 2 minutes.

Who should use this

Use Memos if:

You want a private, self-hosted place to dump quick thoughts, links, and code snippets throughout the day.
You value speed of capture over organization power.
You’re already running a home server or VPS and want something that uses essentially zero resources.
You want to own your notes data without paying a subscription.
You like the Twitter/social-feed UI metaphor for personal notes.

Skip it (use Obsidian instead) if:

You’re building a structured knowledge base with backlinks, graphs, and templates.
You need offline access to your notes.
You want a mature plugin ecosystem (1,000+ plugins).
You write long-form content, not short micro-notes.

Skip it (use Standard Notes instead) if:

End-to-end encryption is a requirement.
You need native apps across all platforms with seamless sync.
Security and longevity matter more than features.

Sources

This review synthesizes 5 independent third-party articles along with primary sources from the project itself. Inline references throughout the review map to the numbered list below.

[1] peterries.net — “Memos - a lightweight, self-hosted note taking app” — general-review (link)
[2] xda-developers.com — “Forget Notion and Obsidian, this self-hosted note-taking tool is my new favorite” — general-review (link)
[3] xtom.com — “Comparing the Top 6 Self-Hosted Note-Taking Apps” — comparison (link)
[4] noted.lol — “Memos — noted.lol hands-on review” — deployment-review (link)
[5] reddit.com — “Memos vs Obsidian vs Standard Notes for daily note-taking” — community-comparison (link)
[6] GitHub repository — official source code, README, releases, and issue tracker (https://github.com/usememos/memos)
[7] Official website — Memos project homepage and docs (https://usememos.com)