Are there free options?

13 tools in this category offer a free plan. Another 8 have a free trial.

How do you rank these tools?

Tools are ranked by a combination of community upvotes, editorial review, and feature breadth. Our editors review pricing and capabilities quarterly.

Can I suggest a tool we're missing?

Yes — submit it through our submission form. Our team reviews submissions weekly.

Notes & Knowledge

Your AI-powered second brain.

17 tools·13 with free plan·8 with free trial

Read the editor's roundup →

AI note-taking and personal knowledge tools that capture, connect, and resurface what you learn.

17 tools reviewed13 with a free plan8 with a free trial5 with an API3 self-hostable1 paid-only

Top picks

Notion AI

Notion AI is an AI-powered workspace assistant integrated into Notion's productivity platform

The most natural fit if your notes and docs already live in Notion — convenient rather than best-in-class, and the value depends on how deep you are in the Notion ecosystem.

freemium·$10/mo

View tool →

Mem

Mem is an AI-powered note-taking and knowledge management platform that automatically organizes notes, meetings, and research

Good for people who want a low-friction notes app that auto-connects related notes and surfaces them via AI search instead of manual folders. The tradeoff is weak formatting and structure, so it suits idea capture more than polished long-form documents.

freemium·Free plan; Pro $12/mo

View tool →

Reflect

Reflect is an AI-powered note-taking app designed for personal knowledge management with networked notes and backlinks

Best for people who want a fast, minimal networked-notes app with backlinks, daily notes, and end-to-end encryption plus a built-in AI assistant. The honest caveat is it is subscription-only with no free tier and offers less extensibility than Obsidian or Logseq.

freemium·$10/mo

View tool →

All Notes & Knowledge

Saner.ai

An AI productivity assistant built for busy, ADHD-friendly minds

#ai-assistant#note-taking#adhd#task-management 1 views

View tool

Heptabase

Visual whiteboards and cards for deep research and learning

#visual-notes#whiteboard#research#pkm

View tool

Tana

An AI-native workspace built on supertags and a knowledge graph

#knowledge-graph#outliner#ai-notes#supertags

View tool

Capacities

An object-based note app that organizes knowledge like your mind

#pkm#object-based-notes#second-brain#graph-view 1 views

View tool

Fabric

AI-powered second brain and workspace for everything you save

#second-brain#knowledge-management#ai-search#notes 1 views

View tool

Recall

AI that summarizes and organizes content into a knowledge base

#knowledge-base#summarization#spaced-repetition#learning

View tool

Saga

An AI workspace that unifies your notes, docs, and tasks with a built-in assistant

#notes#knowledge base#docs#ai writing

View tool

Craft

Beautiful docs and notes app with a built-in AI assistant and MCP connections

#notes#documents#ai-writing#knowledge-management

View tool

mymind

Private AI-powered visual memory for bookmarks, notes, images, and ideas

#bookmarking#personal-knowledge#ai-tagging#privacy 1 views

View tool

Anytype

Local-first, end-to-end encrypted notes and knowledge base with built-in AI

#notes#knowledge-base#local-first#privacy

View tool

Voicenotes

AI voice-note app that records, transcribes, and turns speech into structured notes

#voice-notes#transcription#ai-notes#knowledge-base 1 views

View tool

Fabric

Self-organizing AI workspace for notes, files, and bookmarks

#second-brain#knowledge-management#ai-notes#file-organization 1 views

View tool

AFFiNE

Open-source, local-first workspace combining docs, whiteboard, and an AI copilot

#open-source#local-first#whiteboard#knowledge-base 1 views

View tool

Reor

Private, local AI note-taking app that auto-links notes and runs models offline

#open-source#local-ai#privacy#knowledge-management

View tool

Other AI tool categories

Writing & Content AI Image Generation Coding & Dev AI Video Generation Productivity Research & Data AI Chatbots AI SEO Tools

Frequently asked questions

What's the best notes & knowledge tool?: Notion AI currently leads in community votes. The most natural fit if your notes and docs already live in Notion — convenient rather than best-in-class, and the value depends on how deep you are in the Notion ecosystem.
Are there free options?: 13 tools in this category offer a free plan. Another 8 have a free trial.
How do you rank these tools?: Tools are ranked by a combination of community upvotes, editorial review, and feature breadth. Our editors review pricing and capabilities quarterly.
Can I suggest a tool we're missing?: Yes — submit it here. Our team reviews submissions weekly.