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Outliner

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What Outliner is

Outliner is a free, open-source single-page web app for creating OPML subscription lists and combining OPML files. It runs client side in a modern browser and can be opened directly from its HTML file without a build step, server, or dependencies. Editing supports keyboard shortcuts, indentation, outdenting, collapse and expand controls, hoisting, drag reordering, and localStorage persistence. Add feed turns a node into an RSS feed and attempts to read its title, description, and language. Add include displays another OPML file inline as a read-only live view. Import and export preserve node attributes, with compatibility for Drummer and Frontier files. A URL parameter can open a public OPML file read-only while retaining export. The app works offline, is licensed under MIT, and is listed as version 0.6.0. Phone editing still needs updates.

Who it suits

Outliner suits people assembling subscription lists or composing OPML files from other OPML files. It fits users who prefer a browser-based, client-side tool that can work offline.

What it does well

  • Free and open source under the MIT License
  • No build step, server, or dependencies required
  • Imports and exports OPML with node attributes
  • Keyboard, drag, collapse, and hoist navigation
  • Offline use with localStorage persistence

What to know first

  • Phone editing still needs updates
  • Web app requires a modern browser
  • Read-only included OPML views cannot be edited
  • Version 0.6.0

Verdict

Outliner focuses on structured OPML editing rather than a full feed reader. Its client-side design, offline support, and import/export controls suit people building and maintaining subscription outlines.

Facts from Outliner's own pages

Client side
The maker says everything runs client side in a modern browser. · github.com, 11 Oct 2026
Collapse and expand
The toolbar includes controls to collapse all nodes or expand all nodes. · outliner.andysylvester.com, 11 Oct 2026
Editing
It supports keyboard driven editing, collapse and expand, hoisting, drag reordering, and localStorage persistence. · github.com, 11 Oct 2026
Feeds
The toolbar includes an option to add a feed. · outliner.andysylvester.com, 11 Oct 2026
Hoisting
The app can hoist a node to focus on its subtree, with a control to dehoist. · outliner.andysylvester.com, 11 Oct 2026
Import and export
Import and export preserve node attributes, and the maker says the app is compatible with files from Drummer and Frontier. · github.com, 11 Oct 2026
Includes
The toolbar includes an option to add an include. · outliner.andysylvester.com, 11 Oct 2026
Inspector
The app includes an Inspector for viewing node attributes. · outliner.andysylvester.com, 11 Oct 2026
Intended use
The maker describes use for building subscription lists and composing OPML files from other OPML files. · github.com, 11 Oct 2026
Keyboard shortcuts
The page lists Tab and Shift-Tab for indentation and Alt plus the up or down arrow for moving nodes. · outliner.andysylvester.com, 11 Oct 2026
License
The project is licensed under the MIT License, with copyright credited to Andy Sylvester in 2026. · github.com, 11 Oct 2026
Mobile use
The maker reports testing the app with Android tablet and Google Chrome and says phone editing still needed updates. · andysylvester.com, 11 Oct 2026
OPML files
The app provides controls to import and export OPML files. · outliner.andysylvester.com, 11 Oct 2026
OPML inclusion
Add include links to another OPML file, which can be expanded inline as a read only live view. · github.com, 11 Oct 2026
Purpose
Outliner is a web-based tool for creating and editing outlines. · outliner.andysylvester.com, 11 Oct 2026
Read-only
The toolbar displays a read-only control. · outliner.andysylvester.com, 11 Oct 2026
Read only viewing
A URL parameter can open a public OPML file in read only mode, and the page says it can still be exported. · outliner.andysylvester.com, 11 Oct 2026
Reordering
Outline nodes can be indented, outdented, and moved up or down. · outliner.andysylvester.com, 11 Oct 2026
Security
The opened maker pages do not state security certifications or compliance claims. · github.com, 11 Oct 2026
Setup
The maker says it needs no build step, server, or dependencies; open the HTML file to use it. · github.com, 11 Oct 2026
Version
The page identifies the app as version 0.6.0. · outliner.andysylvester.com, 11 Oct 2026

Where Outliner stands on Freedom251

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