SEO Note vs Obsidian: Choosing the Right Offline Notes Manager

When searching for private, offline-first note-taking software for Windows, Obsidian and SEO Note are two leading choices. Both keep your data local and avoid cloud lock-in.

However, they are built on fundamentally different philosophies for working with information.

Feature Comparison

Feature	Obsidian	SEO Note
Core Concept	Graph network + Markdown vault	Hierarchical outliner tree
File Storage	Multiple .md files in folders	Single .seo database file
Learning Curve	High (Markdown, syntax, plugins)	Zero (tree structure + editor)
Performance	Relatively heavy (Electron)	Classic 1.3.34: Win32 C++, ~2.5 MB, 2-3 s start (2.1 is Electron too, ~121 MB installer)
Customization	Requires plugin selection and updates	Works out of the box
Backup	Copying folder structures	Copying a single file to USB

When Obsidian is the better choice

• You need bidirectional links between notes ([[wikilinks]]) for a "second brain" graph.
• You enjoy customizing the interface with CSS themes and building a plugin ecosystem.
• You prefer plain-text .md files for Git-based sync and version control.

When SEO Note is simpler and more effective

• You want to write immediately, not configure your environment: No plugins, no Markdown syntax, no broken links to fix.
• Project structure is transparent and visual: The hierarchical tree keeps clients, tasks and articles in one visible structure.
• One file is easy to backup and transfer: Instead of thousands of small files, you have a single database file that copies to USB in seconds.
• Minimal resource usage: the classic 1.3.34 build is a lightweight Win32 program: ~2.5 MB download, about 24 MB of memory, 2-3 seconds to the window on a 2015-era Core i5. The 2.1 build is Electron with a ~121 MB installer, and it is the one with AI, the clipper, git sync, Linux packages and an Android APK.

Summary: If you need a simple, reliable, and fast workhorse under Windows for daily notes and knowledge bases — choose SEO Note. If you are building a complex linked "second brain" with plugins — choose Obsidian.

Download SEO Note for free and try the tree outliner right away.

Read also: Notion alternative · TreePad / CherryTree alternatives · Second Brain without the cloud · FAQ

Mini FAQ

Does SEO Note use Markdown files like Obsidian? Not as the storage format: SEO Note keeps the whole tree in one file — .seonote, a SQLite database, in the current 2.1, and .seo in the classic 1.3.34 build — instead of a folder full of loose .md files. Markdown as a note format is supported in 2.1, along with wikilinks and a graph view of the file; the Android app is the exception, where notes are a folder of Markdown files.

Do I have to install plugins to get SEO Note working? It works out of the box, with no plugins to choose or update and no Markdown syntax to learn.

How do I back up my SEO Note data? Copy a single file to USB, instead of copying folder structures for many small files.

Which should I pick for a linked second brain, Obsidian or SEO Note? Obsidian fits a complex linked second brain built with plugins, while SEO Note suits simple, fast daily notes and knowledge bases under Windows.

Which Windows versions does SEO Note run on? The classic 1.3.34 build runs on Windows 7, 8, 10 and 11, 32-bit included: ~2.5 MB download, about 8.7 MB on disk after installation and about 24 MB of memory in use; on a 2015-era Core i5 its window appears in 2-3 seconds. SEO Note 2.1 needs Windows 10/11 64-bit or Linux x64, and its APK runs on Android 6.0 and newer.