📝MythOS describes itself as a networked knowledge platform where every idea, person, project and decision lives as a linked memo in a library you own. 📝Logseq's official repository calls it "A privacy-first, open-source platform for knowledge management and collaboration." They split on structure and reach: MythOS memos can be published, shared and handed to AI agents over 📝MCP, while Logseq builds notes from blocks in an outline.
At a Glance
Structure and Linking
A 2022 Logseq blog post states that "Everything in Logseq is a block" and that "Logseq is unapologetically an outliner," the form described in 📝Outliner. A block can be shown elsewhere through a 📝block reference, and the post notes that individual blocks, not just pages, carry backlinks. The same post advises that "99% of your information should first be entered on the Journals page." In MythOS the unit is the memo. Typing @ draws a mention to another memo, and every mention becomes a 📝backlink that feeds the library's 📝knowledge graph. Each day gets a 📝Daily Memo, MythOS's form of the 📝daily note, with a Tasks checklist and a Timeline. Version History keeps 13 months of restorable edits.
Files, Formats and Status
Logseq's repository says it supports multiple file formats, including 📝Markdown and Org-mode, and that it "focuses on privacy, longevity, and user control." Its code is published under the AGPL-3.0 license. The repository now presents a Database version, or DB version, that "introduces DB graphs" along with a new sync approach called RTC, for Real Time Collaboration. As of November 2026 it states that "The DB version is in beta status while the new mobile app and RTC is in alpha," and warns that data loss is possible. MythOS exports a library as markdown or JSON, and its Content Import brings in an Obsidian vault through a CLI command that converts wikilinks to @ mentions.
AI and Extensibility
Logseq's repository says it "provides a plugin API that enables developers to create custom plugins and extend the functionality of Logseq," a model covered in 📝Plugins / Community Plugins. MythOS exposes a library to MCP clients through one endpoint, mythos.one/api/mcp. 📝Claude on the web, desktop, iOS and Android signs in over OAuth, and a connected client gets 60 tools for search, memo writes, templates, tasks and the daily journal, with four identity memos (Soul, Style, Human and Memory) loaded before it writes. Chat inside MythOS runs on six model providers, on a MythOS-funded balance or the user's own key.
Who Each Is For
Logseq's repository frames it around privacy, longevity and user control. MythOS's own overview says one library serves "private thinking, team collaboration, public writing, and the AI tools you work with." Its Plans & Tiers memo states that "writing is never the thing you pay for": its Free, Scribe, Scholar and Oracle plans sell reach, such as public publishing and agent access.
Related
- 📝MemPalace vs Obsidian vs MythOS as Claude Memory — the hub comparing MythOS with other memory systems
- 📝Obsidian — reference memo on a Markdown note-taking app whose vaults MythOS can import
- 📝Roam Research — a networked-thought system similar in structure to MythOS
- 📝Graph View — how note-taking apps visualize the links between notes