The best second brain apps in 2026

The best second brain app depends on what you save and what you want back. For people who mostly save from their phone (links, screenshots, reels, videos) and want them organized without doing the filing, an AI-first app like Machina, mymind or Recall fits best. If you write a lot and want to own your files, Obsidian is the best choice; for team docs and custom databases, Notion is.

This is Machina's blog, so we have a stake in the answer. We have tried to be fair, used only facts we could check on each vendor's own site, and said plainly where other apps beat ours. Prices are as of October 2026 and in US dollars.

The short version

• Save from your phone and want it organized for you: Machina, mymind or Recall.
• Write long notes and own your files: Obsidian.
• Build a custom system or share docs with a team: Notion.
• Read and highlight long articles, PDFs and newsletters: Readwise Reader.
• Keep it simple and free: Apple Notes, or Raindrop.io for plain bookmarks.

What makes a good second brain app?

If most of your saving happens on your phone, four things matter more than any feature list (we explain the idea itself in what is a second brain):

1. Saving from any app in a couple of taps. On iPhone that means the share sheet. If saving takes more than a few seconds, you will stop doing it.
2. Who does the organizing. Either you file and tag every save, or the app does. Be honest about which one you will actually keep up with.
3. Finding things again. Search by exact words is the minimum. Search by meaning, and asking questions of your library, are what make a large collection usable.
4. Bringing things back. An app that only stores things becomes a graveyard. Some apps resurface saves on their own.

Second brain apps compared

mymind

mymind pitches itself as a private place to save notes, bookmarks, articles and images, and its line "Remember everything. Organize nothing." captures the idea: there are no folders, and saves are sorted and tagged automatically. It recognizes whether a link is an article, product or recipe, can search text inside images, and has a "Serendipity" mode that resurfaces old saves. Its manifesto rules out social and collaboration features.

Saving: the iOS share sheet (App Store), plus Android, macOS and browser extensions.

Pricing: mymind's pricing page lists The Bookmarker at $4.99/month (no AI), Student of Life at $7.99/month or $79/year, and Mastermind at $12.99/month or $129/year. AI summaries and the PDF analyzer are in Mastermind. The pricing page lists no free plan.

Best for: designers and anyone who saves mostly visual inspiration and wants a calm, private place for it. It is also a genuinely beautiful app.

Notion

Notion is a flexible workspace of pages and databases. People build elaborate second brains in it, often with PARA templates, and it is the best option here for team documents and shared wikis.

Saving: the Notion Web Clipper on desktop, and the iOS share sheet from Safari or Chrome, where you title the page and pick a workspace and destination each time.

Pricing: Notion's pricing page lists a Free plan, Plus at $10 per member per month and Business at $20, with yearly billing saving up to 20%. Free and Plus include a limited trial of Notion AI; the fuller AI features, such as Notion Agent, are on Business.

Best for: people who enjoy designing their own system, and teams. Weaker for: fast phone saving, because every save asks where it goes and the organizing is yours to do.

Obsidian

Obsidian is a note-taking app that stores your notes on your device as plain-text Markdown files, with thousands of community plugins. It is the best app on this list for writing and thinking in linked notes, and for anyone who wants files they fully own and can open in any editor in twenty years.

Saving: Obsidian's July 2026 mobile update added an iOS share sheet for saving from Safari, YouTube and other apps without opening Obsidian.

Pricing: the app is free. Sync costs $4/month billed annually or $5 monthly, and Publish $8/month billed annually or $10 monthly.

Best for: writers, researchers and tinkerers. Weaker for: people who want saves summarized and connected for them; out of the box, Obsidian stores what you give it and the linking is your work.

Readwise Reader

Readwise Reader is a read-later app for heavy readers. It handles web articles, newsletters, RSS, PDFs, EPUBs, YouTube transcripts and X threads, with excellent highlighting. Its AI, Ghostreader, can summarize, define terms and answer questions about a document, and your highlights export to Obsidian, Notion and other note apps.

Saving: iOS and Android apps and a browser extension.

Pricing: Readwise's pricing page lists Reader only at $7.99/month and full Readwise at $9.99/month, both billed yearly, with a 30-day free trial.

Best for: people whose second brain is mostly long-form reading. If that is you, read our comparison of read-later apps vs. a second brain.

Apple Notes

Apple Notes is already on your iPhone, and it is better than people assume. Per Apple's guide, Notes search covers typed and handwritten text, objects in images, text in scanned documents, and tags.

Saving: the share sheet, from Safari and most apps.

Pricing: free. Notes sync through iCloud, which includes 5GB free, with iCloud+ starting at $0.99/month for 50GB.

Best for: quick notes and anyone who wants zero setup. Weaker for: a large library, since folders and tags are yours to manage and the app will not file or connect saves for you.

Recall

Recall is an AI knowledge base and the app on this list closest to Machina. It summarizes videos, podcasts and articles, auto-tags saves into a knowledge graph, lets you chat with your saved content, and generates quizzes on a spaced-repetition schedule. It has extensions for Chrome, Firefox, Edge and Safari, plus a web app and iOS and Android apps.

Saving: browser extensions on desktop; on a phone you can share a YouTube video to Recall or paste the link.

Pricing: Recall's pricing page lists a Free plan (unlimited saves, 10 AI summaries a month), Plus at $10/month billed yearly (unlimited summaries, chat, the knowledge graph, quizzes) and Max at $38/month billed yearly.

Best for: people who learn from long videos, podcasts and articles and like being quizzed on them.

Raindrop.io

Raindrop.io is a classic bookmark manager: collections, tags, and sharing with other people. The free plan is free indefinitely with unlimited bookmarks, collections and devices. Pro adds full-text search and permanent copies of pages; its price is not shown on the page we checked, so see their site.

Saving: apps for iPhone, iPad, Android, Mac and Windows, and extensions for every major browser (downloads).

Best for: people who want tidy bookmarks, not summaries.

Machina

Machina is built for people whose saving happens on the phone. You save from the iOS share sheet in any app, such as Safari, YouTube, Instagram, TikTok, X, Reddit, Photos or WhatsApp, in two taps, whether or not Machina is open; on the web you paste a link. Every save is analyzed automatically: Machina writes a summary, category, tags and key concepts, links it to related saves, turns screenshots into searchable text, and turns a long YouTube video into key points with timestamps.

Where it stands apart: Ask Machina answers plain-language questions from your own saves, with citations to the exact saves it used, and Smart review reminders bring a save back the next day, a week later and a month later, plus a weekly synthesis on Sundays.

Where others win: Obsidian is better for writing and local files, Notion for team docs, Readwise Reader for reading and highlighting long articles, and mymind for visual mood boards. Machina runs on iPhone and the web only, so Android users should look at mymind, Recall or Raindrop.io.

Which second brain app should you choose?

Start from your habits, not the feature list:

• If you save a few things a day from social apps and never organize, pick an app that organizes for you: Machina, mymind or Recall.
• If you write, pick Obsidian. If you collaborate, pick Notion.
• If you mainly read long articles, pick Readwise Reader.
• If you want free and simple, Apple Notes is genuinely fine.

Whatever you pick, use one app, not three. The best second brain is the one you will still open in six months, and the main reason people stop is the filing work, not the app.

Machina is free to start on iPhone and the web.