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Software · Office & notes

OutWiker

OutWiker is a note-taking program, available on Windows and Linux: syntax highlighting.

  • Completely free
  • Windows and Linux
  • Open source

Overview

OutWiker is a note-taking program, available on Windows and Linux. Other documented uses: wiki.

Features described in its GitHub repository and on its official website: syntax highlighting.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Personal wiki and outliner.” — Flathub, 10 November 2026
  • “Note-taking application for storing notes in a tree structure” — official website, 10 November 2026
  • “Syntax highlighting for HTML and wiki notation is available on the note editor page.” — official website, 10 November 2026

At a glance

All of OutWiker is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Plans and conditions

  • Free content: the free library can be used without paying, under the publisher’s licence.

Strengths

  • Open source code
  • Commercial use allowed

About

OutWiker is designed to store notes in a tree. Such programs are called "outliner", personal wiki, or tree-like editors. OutWiker's main difference from the other similar programs is keeping the tree of notes in the form of directories on disk, and encouraging changing the base by external sources and programs.

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Official plan pages (pricing, licence, terms) (limits, commercial use) —
  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from Unspecified source (platforms) —
  • Last technical check: 8 November 2026
  • Description from Flathub — AppStream (Flathub)

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