SumizAI vs FileOutliner

What FileOutliner is

What FileOutliner is

FileOutliner is a free notes app for Mac and Windows built around an outliner-style editor — a hierarchical, collapsible list of nodes inspired by WorkFlowy and Logseq — while keeping every note as a plain Markdown file on disk, with no database of its own.

Key features

Notes are edited in outliner mode with an infinite list of nested nodes that can be collapsed and expanded, building a structure of thought from the general down to the specific. Navigation runs through the workspace's file tree, allowing quick switching between notes without losing context. The app offers a toggle between outliner mode and source-code mode, for anyone who sometimes prefers editing raw Markdown directly. Because notes remain plain `.md` files, they can be freely managed through Git or any other text editor outside FileOutliner itself.

Who it's for

FileOutliner appeals to people used to outliner-style thinking — lists that can be nested and collapsed — but who want to avoid the proprietary data lock-in typical of WorkFlowy or similar cloud tools. Anyone already managing their files through Git, or who wants notes accessible to any other program, will find a natural fit here.

Use cases

In practice, FileOutliner works well for sketching out the structure of a longer document from a general outline down to details, for keeping a project log as a nested list of tasks and observations, and for working alongside other tools that operate on Markdown files, where switching between outliner mode and raw source code eases collaboration with external scripts or site generators.

Pricing and business model

The app is free, though closed-source (proprietary) — no published source code, even though user data stays fully open as `.md` files. No subscription and no paid tier sets FileOutliner apart from many competing notebooks with a freemium model.

Limitations and what to watch for

FileOutliner runs on Mac and Windows only — there's no Linux, iOS, or Android version, which rules out mobile sync without external file tools. Because the app is closed-source despite the free model, its future development depends solely on the maker's decisions rather than a community that could carry an open project forward.

AI notes inside the outliner hierarchy

FileOutliner has no direct AI model integration, but because notes are plain Markdown files in outliner mode, pasting a fragment of a conversation with an assistant as an ai notes entry and nesting it under the right topic node is natural and quick. Such an ai notes entry immediately inherits the structure of the hierarchy it's placed in.

What's worth checking before choosing

Before downloading, check the current scope of the free version's features, and whether outliner mode actually suits how a given person organizes their thoughts — not everyone takes to working in nested, collapsible lists instead of flat documents.

Bottom line

FileOutliner is a simple, local outliner for Mac and Windows, combining a collapsible list structure with an open Markdown file format. Anyone who wants ai notes from AI conversations to land automatically in an organized archive instead of being manually pasted into a specific node should consider a tool built around that workflow.

Comparison with SumizAI

FileOutliner and SumizAI differ in where note content comes from. FileOutliner is a notebook for content typed by hand by the user in an outliner structure, with no built-in AI integration. SumizAI generates these notes directly from a conversation with an AI model — at one of seven supported providers — turning answers worth keeping into Markdown files in a vault the user owns, with a table of contents and a duplicate check. Anyone who wants a hand-built hierarchy of thoughts on Mac or Windows will pick FileOutliner; anyone who wants these notes to arise automatically from an AI conversation 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 FileOutliner 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.
• FileOutliner is free and SumizAI costs a dollar a month after a seven-day trial that takes no card. A dollar is what it costs to run accounts and licences without reselling the model; if free is the requirement, FileOutliner wins that row outright.
• Both keep Markdown, which makes moving between them mostly a matter of copying files. In SumizAI a vault is a directory holding base.md — a generated table of contents — and a notes/ folder with one .md file per note.
• AlternativeTo lists no mobile version of FileOutliner. SumizAI runs on macOS, Windows, iOS and Android.

Which one to pick