tell me why people think Obsidian kind of knowledge base? what's it's alternatives, such as AI notes apps.

People view **Obsidian** as a personal knowledge base because it uses **local-first Markdown files** to ensure data ownership, **bidirectional linking** to create a networked "second brain," and a **graph view** to visualize connections between notes. It is designed for deep, long-term knowledge compounding rather than simple document storage.

However, users often seek alternatives due to **Obsidian’s lack of built-in collaboration**, **steep plugin dependency**, and **paid sync fees**. The following **AI-native and modern alternatives** address these gaps:

*   **Recall**: Best for **automatic AI knowledge bases**; it summarizes web content, PDFs, and videos, creating a searchable graph without manual vault maintenance.
*   **Taskade**: An **AI-native workspace** with autonomous agents that organize knowledge, offering real-time collaboration and multiple project views.
*   **Capacities**: Focuses on **object-based note-taking**, structuring information as typed entities with built-in AI chat and a beautiful, intuitive UI.
*   **Logseq**: The top **open-source, local-first outliner**, offering bidirectional links and a graph view similar to Obsidian but with a different workflow.
*   **Notion**: Ideal for **team collaboration** and databases, combining notes with project management and shared wikis in a cloud-native environment.
*   **Reflect**: Provides **AI-assisted daily notes** with end-to-end encryption, focusing on guided writing and calendar context.
*   **Mem**: Uses **context-aware AI** to auto-organize and resurface notes, removing the need for manual tagging or folder structures.

For users who prioritize **automatic capture and AI synthesis** over manual file management, **Recall** and **Taskade** are the leading modern choices. For those who still want **local privacy** but better usability, **Logseq** and **Capacities** are the primary substitutes.