--- title: "SumizAI vs Cotoami" url: "https://sumizai.com/alternative-to/sumizai-alternative-to-cotoami.html" date: "2026-08-14T00:00:00+02:00" modified: "2026-08-14T00:00:00+02:00" description: "Looking for a Cotoami alternative? SumizAI and Cotoami side by side: price, licence, platforms and what each one actually does." tags: ["ai notes", "sumizai", "cotoami", "alternative to Cotoami"] --- # SumizAI vs Cotoami Looking for a Cotoami alternative? SumizAI and Cotoami side by side: price, licence, platforms and what each one actually does. ## What Cotoami is Cotoami (言編み) is an experimental note-taking app from Japan, built around the idea that personal and team knowledge should naturally evolve into a concept-based knowledge base rather than a rigid folder hierarchy. The name combines the Japanese words "koto" (thing) and "ami" (weave) — the whole app is essentially about weaving individual thoughts into a network of connections. It's a standalone, cross-platform desktop application with full offline support. Key features: The basic unit of information is a Coto — a single post you can add as casually as sending a chat message or writing a microblog entry, landing immediately on your timeline. A Cotonoma is a special kind of Coto that acts simultaneously as a folder organizing other entries and as a chat room you can add further posts to. Connections between Cotos and Cotonomas are called Itos (threads) — these are what build the knowledge graph, showing how individual thoughts link into larger conceptual structures. The first version shipped as a web app in 2017, development paused in July 2019, and in 2025, after the pandemic, the developer rebuilt the project from scratch as Cotoami Remake — a desktop application with a built-in map and the ability to connect databases across users. Who it's for: Cotoami appeals to individuals and small teams who want to build knowledge organically — jotting down single thoughts as they occur rather than planning a rigid folder structure upfront. Users interested in concept mapping and visualizing connections between ideas will find a tool built specifically for that kind of thinking rather than linear documents. Use cases: In practice, Cotoami works well for recording loose observations throughout the day that gradually connect into larger thematic threads visible on the concept map. A team working on a shared project can use a Cotonoma as a chat room where every message automatically becomes part of a lasting, searchable knowledge graph instead of disappearing into chat history. Pricing and business model: Cotoami is open source under the Apache-2.0 license, free to use for the desktop version on Windows, Mac, and Linux. The project is developed in an open GitHub repository, without the subscription model typical of commercial knowledge-management platforms. Limitations and what to watch for: As an experimental project developed mainly by one person and going through a multi-year hiatus (2019–2025), Cotoami doesn't offer the same stability or update pace as commercial platforms with dedicated teams. It's worth checking the repository's current activity before building a long-term knowledge archive on top of it. AI notes woven into the concept graph: Cotoami has no built-in AI integration, but its structure built around individual Cotos makes pasting a fragment of an AI conversation as a separate ai notes entry, then linking it via an Ito to related earlier posts, a natural extension of how the app already works. Such a ai notes entry immediately becomes a node in the wider knowledge graph rather than an isolated file waiting to be organized. Bottom line: Cotoami is a Japanese, open-source experiment in building knowledge as a network of connected thoughts rather than a folder hierarchy, revived in 2025 as Cotoami Remake. Anyone who wants ai notes from AI conversations to land automatically in a ready-made archive of Markdown files instead of manual Ito-linking should consider a tool built around that workflow. Comparison with SumizAI: Cotoami and SumizAI differ in how they organize knowledge. Cotoami builds a concept graph from individually, manually linked Cotos and Cotonomas. SumizAI generates these notes directly from a conversation with an AI model, turning answers worth keeping into Markdown files in a vault the user owns, with automatic duplicate checking and a place in the table of contents. Anyone who wants to manually weave a network of connected thoughts will pick Cotoami; anyone who wants these notes to arise automatically from an AI conversation will find SumizAI the better-fitting tool. **Key facts** - Price: Free - License: Open Source - Origin: Japan - Category: Note-taking, Team Collaboration ## What SumizAI is A note-taking application built around a conversation with an AI model. You ask a question, the answer streams back, and the answers worth keeping become Markdown notes — filed into a vault that is a folder on your own disk. A vault is a directory holding `base.md`, a generated table of contents up to six levels deep, and a `notes/` folder with one `.md` file per note. Before a note is written it is checked against the ones already there, so the fourth note about the same idea gets merged instead of added. Links between notes are ordinary Markdown links to files that exist. The model is never ours: you bring your own API key to one of seven providers — Anthropic, OpenAI, Gemini, Groq, OpenRouter, a local Ollama or your own server — and pay that provider directly. A question sends the table of contents plus at most five relevant notes within a 24,000-character budget, and the app shows you which five it used. ## Where they differ - AlternativeTo's description of Cotoami does not mention an AI model. That is the whole starting point in SumizAI: you have a conversation with a model on your own API key, and the answers worth keeping become notes without you filing them. - Cotoami is open source (Apache-2.0), and SumizAI is not. If reading the source is what decides it for you, that is a real argument for Cotoami. The guarantee SumizAI offers instead is structural rather than legal: the notes are Markdown files in a folder you chose, so they open in any editor whether or not the application is running. - AlternativeTo's description of Cotoami does not mention Markdown, so check what format your notes end up in before you fill it up. SumizAI writes standard `.md` files to a folder you picked, and an unpaid account can still export all of them. - Cotoami is described as something more than one person uses at once. SumizAI is not: there are no shared vaults, no comments, no permissions and no sync between devices. If the work is a team's, that is a reason to pick Cotoami over SumizAI. - AlternativeTo lists no mobile version of Cotoami. SumizAI runs on macOS, Windows, iOS and Android. Full side-by-side comparison table and pricing: [https://sumizai.com/alternative-to/sumizai-alternative-to-cotoami.html](https://sumizai.com/alternative-to/sumizai-alternative-to-cotoami.html)