Dev tools · alternatives · 2026

24 alternatives to Open-source Notion alternative.

Local-first Notion alternative with a Claude Code brain

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.… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   Claude Code and Claude 3.7 Sonnet ▲875

   Claude Opus 4.7 is Anthropic's most capable generally available model, released April 16, 2026. It outperforms Opus 4.6, GPT-5.4, and Gemini 3.1 Pro on key benchmarks including agentic coding, multidisciplinary reasoning, scaled tool use, and agentic computer use. It is benchmarked below Claude Mythos Preview — which remains restricted to Project Glasswing partners. https://vucense.com/ai-intelligence/ai-tools/claude-opus-4-7...

   2025 · anthropic.com · its alternatives →

2. 2
   1Code▲569

   Just to clarify the background a bit. This project wasn’t planned as a big standalone release at first. On January 16, Ollama added support for an Anthropic-compatible API, and I was curious how far this could be pushed in practice. I decided to try plugging local Ollama models directly into a Claude Code-style workflow and see if it would actually work end to end. Here is the release note from Ollama that made this possible: https://ollama.com/blog/claude Technically, what I do is pretty straightforward: - Detect which local models are available in Ollama. - When…

   Jan 2026 · github.com · its alternatives →

3. 3
   The "think" tool from Claude▲601

   Enabling Claude to stop and think

   2025 · anthropic.com · its alternatives →

4. 4
   Second Brain for AI▲286

   Persistent memory for Claude, ChatGPT & Cursor. Free.

   May 2026 · github.com · its alternatives →

5. 5AP
   A plain-text cognitive architecture for Claude Code▲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.

   Mar 2026 · lab.puga.com.br · its alternatives →

6. 6
   BrainLoom▲288

   Turn PDFs into Flashcards. The local-first Learning OS.

   Jan 2026 · brainloom.app · its alternatives →

7. 7
   Claude 2▲248

   It was quite interesting to vibe code this artifact. I learned some basic ideas about commitment scheme and hash cryptography in the half and hour spent on this. One of the few times vibe coding left me feeling enriched rather than drained. What do you think?

   2023 · claude.ai · its alternatives →

8. 8
   Markdown Studio▲126

   Markdown editor built for the AI workflow era

   Dec 2025 · mdstudio.app · its alternatives →

9. 9
   CC-BEEPER▲223

   A floating macOS pager for Claude Code

   Apr 2026 · github.com · its alternatives →

10. 10
    Fork of Claude-code working with local and other LLM providers▲177

    2025 · github.com · its alternatives →

11. 11
    Skilldocs▲192

    I got fed up with Notion, so I built my dream document editor. It's all markdowned so it's easy to view skills or other agent-related documents. It's got the collaboration features I love from Figma (shared cursory and the ability to follow) and Google Docs (comments, realtime editing). Then you can export the diff and comments to an agent. I've been really liking it for talking over skill documents live on a call. I'm curious if this resonates with other people. More generally, I feel like notion is less and less relevant in an age where documents have a very different purpose and Markdown…

    Aug 2026 · skilldocs.dev · its alternatives →

12. 12
    OpenIT▲63

    OpenSource alternative to ServiceNow that runs on ClaudeCode

    May 2026 · openit-app.github.io · its alternatives →

13. 13
    We want to displace Notion with collaborative Markdown files▲29

    Hi 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…

    Mar 2026 · moment.dev · its alternatives →

14. 14
    ShioriCode▲119

    Open-source alternative to Codex & Claude Code

    May 2026 · shiori.ai · its alternatives →

15. 15
    Claude-Mem▲115

    AI agent memory, everywhere. claude-mem is open-source memory for Claude Code; cmem links it to any MCP client — Cursor, Codex, more — via one private link.

    Dec 2025 · cmem.ai · its alternatives →

16. 16
    RightNow CLI▲121

    I locked in for 18 hours and built Claude Code for CUDA. It is completely open source! It writes CUDA kernels, debugs memory issues, and optimizes for your specific GPU. It is a fully agentic AI with tool calling built specifically for the CUDA toolkit This is the CLI version of RightNow AI code editor, our GPU-native code editor with a built-in emulator, visual profiling, and remote GPU access. The CLI is open source, lightweight, and fast. It is designed for anyone who wants AI help with CUDA without setup I used Python because it is the most common language, so anyone can build on top of…

    2025 · github.com · its alternatives →

17. 17
    Retain – A unified knowledge base for all your AI coding conversations▲45

    Hey 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…

    Jan 2026 · github.com · its alternatives →

18. 18IB
    I built my own second brain software tool▲41

    Field notes on shipping fast, privacy-first, evergreen web products.

    2021 · joeldare.com · its alternatives →

19. 19
    Bindly▲76

    Hi HN, I’m a product designer by background, not a traditional software engineer. Over the last year, tools like Claude and ChatGPT completely changed how I work. I started with small internal tools, and now I’m “vibe coding” multiple highly personalized apps. As I iterated between Claude Code (implementation) and ChatGPT (ideation / thinking), I kept running into the same problem. To think clearly, I had to repeatedly re-explain: - what the code currently does, - what changed recently, - and why certain decisions were made. That re-summarization step became a real bottleneck. So I…

    2016 · bind.ly · its alternatives →

20. 20
    Vibe Prolog▲44

    Like a lot of people I got the $250 Claude Code credit and didn't use it up. I decided to try to use it up over the weekend using (mostly) my phone and vibe coded a Prolog interpreter. Now I'm seeing how far I can push it.

    Nov 2025 · github.com · its alternatives →

21. 21
    Papersnap – Claude 2-Powered Mind Maps from Research▲20

    2023 · poe.com · its alternatives →

22. 22
    Sx – an open-source package manager for AI skills, MCPs, and commands▲50

    Claude Code is amazing for individuals but terrible for teams. I spent the last six months building my perfect mix of MCP servers, subagents, commands and skills. Claude Code writes 100% of the code now, but sharing this with my team? Painful. 1. Blog posts and workshops don't work (and don't scale) 2. Committing tools to N repos means N PRs. A tool changes? N more PRs. 3. Same tools, different files or folders for each AI assistant; not everyone uses Claude Code It is like 1999 all over again; FTPing files up to prod and versioning with ".bak" suffixes. So I built sx. It is your team's…

    May 2026 · github.com · its alternatives →

23. 23
    Sticky Notes▲10

    I've been wanting a simple sticky notes board as my browser's new tab page for ages. So last week I built one in half a day using Claude Code. It's written in Vue 3, client-only. The code quality honestly surprised me. I wrote an extensive prompt: what it should do, what it should look like, how I wanted the project set up, reusable components, composables, what I wanted and didn't want. Put Claude to work, went for a walk, came back to more or less what you see on the site. It wrote some code I would've done differently, but it also did useful things I hadn't thought of. No backend, no…

    2024 · notionwithali.gumroad.com · its alternatives →

24. 24IM
    I made a free (open-source) extension, to use any LLM on Google sheet▲14

    Hello everyone, This past Saturday, I decided to make purchase on Cursor after hearing how good it is with Composer function that allow to generate code on fly, especially on Claude Sonnet (not an affiliate of the products, just curious!). To make the purchase worthwhile, I challenged myself to build a Google Sheets extension in just 24 hours that allows users to connect with any Language Model (LLM)—whether it’s ChatGPT, Claude, Groq, or Gemini. The Idea The idea was simple: a formula like =Claude(prompt, model) that lets users integrate AI anywhere in their sheets. The most impressive…

    2024 · aisheeter.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →