Best Second Brain Apps

249+ iOS apps curated and reviewed

4.9 avg rating
20 free apps
Updated November 2026

From beginner-friendly picks to power-user tools, our second brain list covers 249+ iPhone apps updated through November 2026. Compare ratings, prices, and screenshots in one place.

Compare top Second Brain Apps (November 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Second Brain - AI AssistantSecond Brain - AI AssistantFree—NoYesOct 2026
2Notion: Notes, Tasks, AINotion: Notes, Tasks, AIFree4.8★ (91K)NoYesNov 2026
3Obsidian - Connected NotesObsidian - Connected NotesFree4.5★ (2.8K)NoNoOct 2026
4Second Brain: ADHD PlannerSecond Brain: ADHD PlannerFree5.0★ (1)NoNoOct 2026
5Cohestry: Second BrainCohestry: Second BrainFree5.0★ (1)NoYesOct 2026
6nook: second brainnook: second brainFree5.0★ (3)NoNoSep 2026
7Second Brain: Voice to ActionSecond Brain: Voice to ActionFree—NoYesAug 2026
8Squirrel: ADHD Second BrainSquirrel: ADHD Second BrainFree5.0★ (4)NoNoOct 2026

Top Picks for Second Brain

Notion: Notes, Tasks, AI#2

Notion: Notes, Tasks, AI by Notion Labs, Incorporated

Plan, organize, track projects
Strong Contender
📊 Productivity
4.8😊(91K ratings)
FreeIn-App Purchases
#52in Productivity
Notion: Notes, Tasks, AI screenshot 1
Notion: Notes, Tasks, AI screenshot 2
Notion: Notes, Tasks, AI screenshot 3
Notion: Notes, Tasks, AI screenshot 4
Notion: Notes, Tasks, AI screenshot 5
Notion: Notes, Tasks, AI screenshot 6

This AI-powered workspace helps you write notes, manage tasks, organize projects, and collaborate with others. It offers features like AI meeting notes and interactive maps to streamline your workflow for personal, student, or professional use.

What We Love

  • 🚀 Great tool for school organisation
  • 👍 Game-Changer for Productivity
  • ⭐️⭐️⭐️⭐️⭐️ Versatile and customizable
  • 👍 Calendar view is amazing
  • 👍 Amazing & altruistic
  • 👍 Amazing! Great for students
  • 🚀 Truly game-changing
  • 👍 Life Changer
  • 👍 Fellow Researching Nerds, this app is a game changer!
  • 👍 Absolutely love this app
  • 👍 Amazing app, although the features are a bit clunky and unintuitive at times
  • 👍 Awesome app, but Stop opening new pages in tables when adding new items please
  • 👍 Never been more organized
  • 👍 Amazing productivity app

Room to Improve

  • 🐛 Frustrating Search and Useless AI
  • 🐛 Buggy and nagging (iPad M1)… moving to click up if it does get more stable
  • 🔒 No offline mode
  • 🐛 Glitchy iPad experience
  • 🐛 Terrible on iPad
  • 🐛 CS is most likely AI bots
  • 🐛 Nightmare
  • 🐛 Terrible mobile app
  • 🐛 Swipe to type unsupported
  • 🐛 Broken?
  • 🐛 S-L-O-W
  • 🐛 Needs better instructions
  • 🐛 The mobile app is a disaster
  • 🐛 Doesn't
  • 🐛 Clunky on iPad OS, needs better copy paste, no offline mode
Obsidian - Connected Notes#3

Obsidian - Connected Notes by Dynalist Inc.

Your second brain on the go
Worth Considering
📊 Productivity
4.5😊(2.8K ratings)
Free
Obsidian - Connected Notes screenshot 1
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Obsidian - Connected Notes screenshot 5
Obsidian - Connected Notes screenshot 6

Organize your thoughts and ideas with a powerful knowledge base that utilizes local Markdown files. This app acts as your personal second brain, accessible on your mobile device for seamless note-taking and idea connection.

What We Love

  • 🚀 Powerful features
  • 👍 Customizable and flexible
  • 🔒 Secure and private
  • 💡 Innovative note-taking approach
  • 🚀 Smooth mobile experience
  • 👍 Excellent desktop and mobile integration
  • 👍 Vibrant community and plugin ecosystem

Room to Improve

  • 🐛 Sync issues and unreliable iCloud integration
  • 🔋 Slow startup and performance issues on mobile
  • 👎 Steep learning curve for new users
  • 👎 Limited sorting and organization options
  • 👎 Lack of WYSIWYG editing on mobile

More Second Brain apps to explore

FAQ about Second Brain

Are there free second brain apps for iPhone?
Yes — 20 of the top second brain apps we rank are free to download, including Second Brain - AI Assistant and Notion: Notes, Tasks, AI.
Second Brain - AI Assistant has no ads and offers in-app purchases, according to its App Store listing as of November 2026.
We track 249+ second brain apps on the iOS App Store as of November 2026, ranked by rating, recency, and analysis of real user reviews.

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