
SeqLog
Logseq
Obsidian.md
Roam Research
Tempreon
ChainMemory
Memori
Mem0
Agentmemory
TheSecondBrain.dev
cognee
VATES.jp
SeqLog is a native macOS outliner for people who want their notes to stay ordinary files.
Every note is a plain Markdown file in a folder you choose. There is no database and no proprietary format, so ripgrep, git, or any other tool on the machine reads exactly the same bytes. Full text search runs over the folder itself, so there is no index to rebuild or corrupt.
A daily journal and named pages sit side by side. Wikilinks connect them and every page lists the blocks that link to it. A command palette searches page names and file contents together.
Git is embedded rather than shelled out. Edits are committed in the background, the history panel expands each commit into an inline diff, and any single file can be reverted on its own.
It opens an existing Logseq vault in place, because it uses the same journals/ and pages/ folder layout. Nothing to import, nothing to convert.
Written in Swift on AppKit rather than Electron. Free for macOS.
Tempreon is a personal memory layer for your AI tools, connected over MCP. Your knowledge, preferences, and decisions travel across Claude, ChatGPT, Cursor, and any MCP-capable client โ captured once, available everywhere. It learns how you actually work instead of just storing what you said.
SeqLog
TempreonTempreon's answer:
Tempreon started with a simple observation: AI models keep changing, but the thing that makes them useful to you โ your context, your preferences, your judgment โ gets rebuilt from scratch inside every tool, and lost every time you move.
We built the layer that fixes that: person-owned memory served over the open Model Context Protocol, so it works across assistants instead of belonging to one. Along the way we open-sourced the pieces that are useful to everyone regardless of whether they use Tempreon โ like memhaul, our MIT-licensed CLI for turning ChatGPT and Claude data exports into files you own.
The through-line is custody: the model is temporary, your memory shouldn't be.
Tempreon's answer:
Most alternatives in this space are memory infrastructure for developers building their own AI apps. If you're the person using several AI tools every day, that's not your problem โ your problem is re-explaining yourself to each of them and losing everything when you switch.
The choice is really about who the memory is for. Ours is for you.
Tempreon's answer:
Tempreon is built for the person, not the app. Most memory products are developer APIs for adding memory to a single product; Tempreon is a memory layer you own that travels with you across every AI tool you use โ Claude, ChatGPT, Cursor, anything MCP-capable.
Tempreon's answer:
Individuals who live in AI tools all day: operators, consultants, founders, sales professionals, and knowledge workers who use more than one assistant and are tired of being a stranger to each of them.
If you've ever pasted the same context into Claude and ChatGPT in the same week โ you're the audience.
Tempreon's answer:
The protocol choice is the product decision: build on the open standard, and your memory works everywhere the standard does.
Logseq - Logseq is a local-first, non-linear, outliner notebook for organizing and sharing your personal knowledge base.
ChainMemory - Portable, verifiable memory for AI agents โ works across ChatGPT, Claude, Gemini and any MCP client
Obsidian.md - A second brain, for you, forever. Obsidian is a powerful knowledge base that works on top of a local folder of plain text Markdown files.
Memori - Persistent memory from agent trace, not just conversation
Roam Research - A note-taking tool for networked thought
Mem0 - Your private, local memory layer for all AI tools