Open-source Notion alternative.
Local-first Notion alternative with a Claude Code brain
Open-source Notion alternative. launched on June 6, 2026 with 7 votes, #1,808 of 22,647 launches that month and more than 90% of that year's launches.
In plain words
Paperus is an open-source, local-first workspace that combines markdown notes, email, calendar, and tasks in a single application. All data syncs peer-to-peer with end-to-end encryption and stays on the user's machine. It includes a Company Brain powered by Claude Code that can answer questions across the workspace, draft replies, and manage tasks with user approval. The tool requires no account, cloud services, or data uploads, making it suitable for users prioritizing privacy and data ownership.
written from the facts on this page · September 2026
From the sources
An open-source, local-first Notion alternative. Plain-Markdown notes that sync peer-to-peer, end-to-end encrypted with a Company Brain that answers across your workspace using the Claude Code you already run, or a fully-local model. No account, no cloud.
An open-source, local-first workspace. Markdown notes, email, calendar and tasks in one app — synced peer-to-peer, end-to-end encrypted — with a Company Brain powered by your own Claude Code that doesn
Paperus is the open-source, local-first workspace: Markdown notes , email , calendar and tasks in one app, synced peer-to-peer and end-to-end encrypted. A Company Brain powered by the Claude Code you already run doesn't just answer across it — it drafts replies, schedules events and acts, with your approval. No account. No cloud. No lock-in. Universal · signed & notarized by Apple · macOS 11+ · v1.3.0 · AGPL-3.0 · free forever Ask anything across every note in plain language. Retrieval runs 100% on your machine — your notes are indexed on disk and never uploaded to index them. For the answer, plug in the intelligence you trust: the Claude Code you already run, a fully-offline local model,…from oss.naridon.com
Does a similar job
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Second Brain for AIMay 2026 · github.com · ▲286Persistent memory for Claude, ChatGPT & Cursor. Free.
- APA plain-text cognitive architecture for Claude CodeMar 2026 · lab.puga.com.br · ▲157
One memory, not one per tool. Cog gives AI agents a shared, structured memory layer using plain-text files — portable across Claude Code, Codex, Cursor, Gemini CLI, Windsurf, Copilot, and more.
OpenITMay 2026 · openit-app.github.io · ▲63OpenSource alternative to ServiceNow that runs on ClaudeCode
We want to displace Notion with collaborative Markdown filesMar 2026 · moment.dev · ▲29Hi HN! We at Moment[1] are working on Notion alternative which is (1) rich and collaborative, but (2) also just plain-old Markdown files, stored in git (ok, technically in jj), on local disk. We think the era of rigid SaaS UI is, basically, over: coding agents (`claude`, `amp`, `copilot`, `opencode`, etc.) are good enough now that they instantly build custom UI that fits your needs exactly. The very best agents in the world are coding agents, and we want to allow people to simply use them, e.g., to build little internal tools—but without compromising on collaboration. Moment aims to cover…
Retain – A unified knowledge base for all your AI coding conversationsJan 2026 · github.com · ▲45Hey HN! I built Retain as the evolution of claude-reflect (github.com/BayramAnnakov/claude-reflect). The original problem: I use Claude Code/Codex daily for coding, plus claude.ai and ChatGPT occasionally. Every conversation contains decisions, corrections, and patterns I forget existed weeks later. I kept re-explaining the same preferences. claude-reflect was a CLI tool that extracted learnings from Claude Code sessions. Retain takes this further with a native macOS app that: - Aggregates conversations from Claude Code, claude.ai, ChatGPT, and Codex CLI - Instant full-text…
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