Best Zkn (Zettelkasten) Alternatives & Competitors in 2025

Write Markdown documents with a comprehensive GUI and many workflow/time management tools.

Open Source

A second brain, for you, forever. Obsidian is a powerful knowledge base that works on top of a local folder of plain text Markdown files.

Create in-app experiences with the most straightforward product adoption platform — quick implementation, lasting user engagement.

Try for free paid Free Trial $69.0 / Monthly (Basic; Guides & Checklists, Knowledge Base, In-app Surveys)

All-in-one workspace. One tool for your whole team. Write, plan, and get organized.

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.

Open Source free

TiddlyWiki for Windows.

wikidPad is an application for storing thoughts, ideas, todo lists, contacts, or anything else that user can think of to write down.

Open Source

a non-linear personal web notebook

Open Source

Logseq is a local-first, non-linear, outliner notebook for organizing and sharing your personal knowledge base.

Open Source free

TiddlyDesktop is a special purpose web browser for working with locally stored TiddlyWikis.

Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.

Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.

Create, share, and understand knowledge in a new way

freemium

Scrivener is a content-generation tool for composing and structuring documents.