SumizAI vs Eidos

What Eidos is

What Eidos is

Eidos is an extensible framework for managing personal data throughout your lifetime in one place, developed as a work-in-progress project and positioned as an offline alternative to Notion. The project, maintained on GitHub under the user mayneyao, comes from China and combines a simple text editor with an Airtable-like database.

Key features

A simple, beautiful rich text editor supports Markdown, and a high-performance Airtable-like database helps manage structured data alongside plain notes. A fully rebuilt AI agent operates in a sandboxed environment with file-system access, a skill system, and granular permission controls, deeply integrated with LLMs for translation, summarization, explanation, and data visualization. Vector embedding support enables semantic search within table text fields, and the Eidos CLI works directly with Claude Code and Codex.

Who it's for

Eidos appeals to developers and technical users who want a fully local, extensible knowledge-management system combining notes with a database, with the ability to write their own extensions and scripts.

Use cases

In practice, Eidos works well for building custom data importers from GitHub Issues, Jira tickets, or other sources into one local source of truth, keeping a structured database alongside text notes, and working alongside tools like Claude Code through the command-line interface.

Pricing and business model

Eidos is open source and free — the code is fully available on GitHub, with no licensing fees. As a work-in-progress project, development is funded by the community around the repository.

Limitations and what to watch for

Work-in-progress status means some features may change between versions, and documentation sometimes lags behind the pace of development. Extensibility through custom scripts and importers requires basic programming knowledge, so less technical users may feel overwhelmed.

AI notes in a database with vector embeddings

Eidos offers no ready-made chat with an external model beyond its own AI agent, but pasting an answer as an ai notes entry into a table with vector embedding support later enables semantic search over that content, not just literal keyword matching.

A sandboxed AI agent as a deliberate security tradeoff

The decision to run the AI agent in a sandboxed environment with granular permissions, rather than giving it full system access, reflects a cautious approach to autonomous tools with access to a user's file system.

What's worth checking before choosing

Before choosing Eidos, check the current state of development on GitHub given its work-in-progress status, and whether the extension features cover your specific integration needs.

Bottom line

Eidos is an extensible, local framework combining notes with a database and a sandboxed AI agent, at the cost of a work-in-progress status. Anyone who wants ai notes from AI conversations to land automatically in a ready-made archive without writing their own integrations will find a better-fitting tool elsewhere.

Comparison with SumizAI

Eidos and SumizAI differ in configurability. Eidos is an extensible framework requiring technical knowledge to fully exploit its integration and AI agent capabilities. SumizAI is a finished notebook app where a conversation with an AI model automatically turns into ai notes saved as Markdown files in the user's vault, with no coding required, on your own API key to one of seven providers. Anyone who wants an extensible framework for building their own data-management system will pick Eidos; anyone who wants these notes from AI conversations to be created automatically with no configuration will find SumizAI the better-fitting tool.

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.

Every answer kept this way becomes one of these ai notes, ready to search again months later without hunting back through old chats.

Side by side

Where they differ

• AlternativeTo's description of Eidos 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.
• Eidos is open source (AGPL-3.0), and SumizAI is not. If reading the source is what decides it for you, that is a real argument for Eidos. 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 Eidos 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.
• Eidos is extensible through plugins. SumizAI is not, and that is a genuine trade: you cannot bend it into something else, but there is also no plugin to keep working after the next release. What it does instead is fixed and small — a chat, a filing rule and a folder of Markdown.
• AlternativeTo lists no mobile version of Eidos. SumizAI runs on macOS, Windows, iOS and Android.

Which one to pick