1
SigmaNote
sigmanote.appSigmaNote organizes PDFs, voice notes, webpages, and videos into a searchable knowledge base for AI-assisted learning and work.
Alternatives
The Best Open Notebook Alternatives in 2026
8 alternatives1 free · 3 open source
Looking for something like Open Notebook? Here are 8 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 1 are free or have a free plan and 3 are open source.
About Open Notebookopen-notebook.ai
VisitOpen Notebook provides a private workspace for learning, research, and organizing knowledge.
Top picks at a glance
First suggestionSigmaNoteSigmaNote organizes PDFs, voice notes, webpages, and videos…Free or freemium optionAppFlowyAppFlowy is a self-hosted AI workspace for enterprise teams…Another optionButterflyLinwood Butterfly provides an endless workspace for…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | SigmaNote | — | Not stated | Web |
| 2 | Butterfly | — | Not stated | Web |
| 3 | AppFlowy | Freemium | Yes | Web, Windows, macOS |
| 4 | Trilium | — | Not stated | Web |
| 5 | Butterfly | — | Yes | — |
| 6 | Emanote | — | Not stated | — |
| 7 | Siyuan | — | Yes | — |
| 8 | Mem | — | Not stated | Web |
All Open Notebook alternatives
2
Butterfly
butterfly.linwood.devSame kind of online tool
Linwood Butterfly provides an endless workspace for handwriting, sketching, annotating, taking notes, and organizing ideas.
3
Open source · free plan
AppFlowy is a self-hosted AI workspace for enterprise teams to manage projects, wikis, and data with private AI, flexible databases, and full data control.
4
Trilium
triliumnotes.orgSame kind of online tool
Trilium Notes is an open-source app for taking notes and organizing a personal knowledge base locally or through synchronization.
5
Open source
Butterfly supports handwritten note-taking, drawing, and organizing ideas in an open-source endless workspace.
6
Emanote
github.com/srid/emanoteTurn plain-text notes into structured websites such as blogs, wikis, notebooks, and knowledge bases with Emanote.
7
Open source
SiYuan offers a self-hosted knowledge workspace described as open-source and privacy-first, with collaboration for people and AI agents.
8
Mem
mem.aiMem organizes meeting notes, projects, and knowledge bases for teams with searchable AI features.
No alternatives match this filter.
Alternatives to similar tools
Emanote13 alternativesAppFlowy19 alternativesButterfly24 alternativesButterfly12 alternativesTrilium24 alternativesSiyuan24 alternatives
TopicNotes & Knowledge Management · 92 sites Best-of listBest Free Note-Taking Apps for Offline Use ListingOpen Notebook details
What is the best alternative to Open Notebook?
Based on features, tags and platforms, the closest alternatives to Open Notebook are SigmaNote, Butterfly, and AppFlowy.
Is there a free alternative to Open Notebook?
Yes. AppFlowy is free or offer a free plan.
Are there open-source alternatives to Open Notebook?
Yes: AppFlowy, Butterfly, and Siyuan.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative