SecondBrain · Blog · Best second brain apps

The best second brain apps in 2026, by how you actually capture

By Federico Cesarini, maker of SecondBrain · Updated October 29, 2026 · 12 min read

Transparency: I build SecondBrain, one of the apps below. Claims about the others come from the vendors' own pages, linked in the text or listed under Sources, checked on October 29, 2026. Nothing here is a paid placement.

The comparison at a glance

Fifteen apps that people use as a second brain, with the facts that decide whether one will still be in use a month from now. Read the rows for your situation, not the whole table.

How this list was put together

Every fact in the table comes from the vendor's own pricing page, help center, store listing or announcement, read on October 29, 2026; the pages are listed under Sources at the end. This is not a lab test with scores. A score would hide the one thing that decides whether a second brain survives: whether putting a thought in and getting it back out fits the way you already live.

The apps are grouped by that, by how ideas reach them, because the most common reason a second brain dies is not a missing feature. It is that capturing feels like homework, so you stop. Pick the group that matches your days, then compare inside it.

If your ideas arrive while you are moving: voice-first apps

Most ideas do not show up at a desk. They show up on a walk, on the train, between meetings, with your hands full. Typing them into a phone is slow: in a Stanford study, dictating short messages on a phone was about three times faster than typing them. Voice-first apps are built for that moment.

SecondBrain: speak once, everything gets filed

You tap record and talk for up to two minutes. SecondBrain writes the note, gives it a title, files it in the right folder, and creates any calendar events and reminders it heard, in the same pass. It answers in the language you spoke. On iPhone you can start recording from Control Center or Back Tap without opening the app, and share audio files into it from other apps. Later you ask instead of search: "what did I decide about the kitchen quote?"

The second half is what makes it different from a voice recorder. With Pro, that same memory is connected to Claude, ChatGPT, Gemini, Cursor and Claude Code over the Model Context Protocol, so the assistants you already use can read and add to it. It runs on iPhone, Android and the web, stores data in the EU, and is rated 5.0 on the App Store. The free plan is small: it holds 10 notes and allows up to 3 AI requests a day, which is enough to find out whether speaking your notes suits you. Choose it if you think out loud and want your notes to be useful to your AI assistants too. Skip it if you prefer to write long-form and design your own structure.

Voicenotes: the polished voice journal

Voicenotes records, transcribes and summarizes, lets you ask questions across everything you have said, and produces meeting reports with speaker labels. Its free plan includes 100 transcription minutes a week but shows only the last 30 days of notes, and since March 2026 it has an official MCP server that ChatGPT and Claude can connect to, which its pricing page lists under Pro. It does not try to run your calendar. Choose it if you want a voice journal and meeting notes more than an organizer.

Two typing-first apps below also take voice now: Tana Outliner turns mobile voice memos into structured notes, and Mem has a Voice Mode. Google added Keep Live, which turns a spoken brain dump into organized notes, for paid Google AI plans. For a closer look at the voice-first group alone, see the voice-first comparison.

If you think by writing: Obsidian, Logseq and Reflect

Obsidian: your notes as files you own

Obsidian stores every note as a plain Markdown file in a folder on your device, and the app is free without limits, including for work. You pay only for extras: Sync starts at $4 a month billed yearly and is end-to-end encrypted. There is no AI built into the app. Its built-in audio recorder saves clips into a note but does not transcribe them, and there is no official connector for ChatGPT or Claude; a command-line tool and dozens of community plugins fill that gap for people comfortable setting them up. Choose it if you write to think and want files that will outlive any company.

Logseq: the open-source outliner, in transition

Logseq is free and open source. In April 2026 it split in two: Logseq OG keeps file-based Markdown graphs but gets maintenance only, while the new database version, still in beta, is where development happens and ships an optional local MCP server. Choose it if you like daily outlining and do not mind beta software.

Reflect: daily notes, now open source

In July 2026 Reflect launched Reflect Open: an MIT-licensed app that keeps notes as Markdown files, free on the Mac, with the iPhone app at $99 a year or $9.99 a month. AI is optional and runs on your own OpenAI, Anthropic or Google key, including transcription of audio memos. The original cloud app, now called Reflect Classic, is still maintained and has a local MCP server for coding agents. Choose it if you live in daily notes and want your files local.

If your notes are really projects and databases: Notion, Tana Outliner, Capacities and Anytype

Notion: the all-in-one workspace

Notion is still the strongest place to run docs, wikis and projects together. The Plus plan is $10 a month billed yearly, and the full Notion AI (agents, AI meeting notes, enterprise search) comes with the Business plan; Free and Plus get a limited trial. Notion runs an official hosted MCP server, so Claude, ChatGPT and Cursor can work with your pages. It is typing-first: you build and maintain the structure yourself. Choose it if your second brain is mostly shared projects.

Tana Outliner: structure with supertags

The note app people know as Tana is now called Tana Outliner, at outliner.tana.inc, while tana.inc has become a separate meeting product. Supertags turn plain notes into typed data, AI runs on monthly credits, and mobile voice memos are transcribed into structured notes. It has a free local MCP server plus a hosted one in beta on paid plans, which start at $8 a month billed yearly. Choose it if you want a knowledge graph and enjoy designing it.

Capacities: notes as objects

Capacities treats every note as a typed object, a person, a book, a meeting, and links them. The free plan has no AI; Pro is $9.99 a month billed yearly and includes official connectors for ChatGPT and Claude. Choose it if you think in things rather than pages.

Anytype: private by design

Anytype is local-first, its sync is end-to-end encrypted, and it can run with no cloud at all. The free plan includes 100 MB of synced files and the paid plans start at $4 a month billed yearly. It has no built-in AI yet, but an official local MCP server lets desktop assistants such as Claude read it. Choose it if privacy matters more to you than convenience.

If you think visually: Heptabase

Heptabase lays notes out as cards on whiteboards, which suits research and learning a hard subject. There is no standalone free plan, only a 7-day trial, and Pro is $8.99 a month billed yearly with a small monthly AI credit. Voice notes are transcribed with credits, and an official MCP server plus plugins connect it to ChatGPT and Claude. Choose it if you need to see how ideas fit together.

If you want AI to do the organizing: Mem and Gemini Notebook

Mem: notes that sort themselves

Mem relaunched as Mem 2.0 in October 2025 as an AI thought partner; today its agent finds tasks and projects in your notes and answers questions about them. Pricing is now by usage: the free plan allows 25 notes and 25 messages a month, and paid plans start at $9 a month. There is no Android app, and an official MCP server connects it to Claude and ChatGPT. Choose it if you want to dump notes in and let AI find the structure.

Gemini Notebook, formerly NotebookLM: study what you upload

Google renamed NotebookLM to Gemini Notebook in July 2026. It answers only from the sources you add, up to 50 per notebook on the free plan, and turns them into Audio Overviews, slides and mind maps. It is an excellent study tool and a weak inbox: there is no quick capture, and no consumer connector for other assistants. Choose it if your second brain is mostly reading.

If you need something today: Evernote, Apple Notes and Google Keep

Evernote is still a capable all-rounder with a web clipper and a meeting recorder. Its free plan is tight, 50 notes on one device, and Starter costs $99 a year. It opened an MCP server in beta for paid plans in October 2026.

Apple Notes is free, already on your iPhone, and now records audio with a live transcript on iPhone 12 and later; summaries need an Apple Intelligence iPhone. Google Keep is the fastest place for lists. Apple Notes does not organize for you, Keep only does through Keep Live on paid Google AI plans, and neither connects to ChatGPT or Claude. If your second brain is ten notes and a shopping list, start here and move when it hurts.

Choose with the three-note test

Feature lists cannot tell you whether an app fits your habits. This can:

1. Pick three real things from this week: a decision you made, a date you must not miss, and a half-formed idea.
2. Capture each one the way you naturally would. If you would normally say it out loud, say it. If you would type, type. Do not tidy anything.
3. Wait three days, then get each one back without remembering where you put it. Ask, search or browse, whatever the app offers.
4. Score it: did all three come back, how many taps did it take, and did the date turn into an actual reminder or just sit in a note?

The app that returns all three with the least effort is your second brain. The one you had to organize first is a filing cabinet, and filing cabinets get abandoned.

Which apps can ChatGPT and Claude read?

A year ago this was a short list. Today Notion, Mem, Voicenotes, Tana Outliner, Capacities, Heptabase, SecondBrain and, since October 2026, Evernote run official MCP servers or connectors, several of them only on paid plans, and Anytype and the new Logseq offer local ones. Apple Notes, Google Keep, Gemini Notebook and Reflect Open have no connector for chat assistants, and Obsidian has only its command-line tool and community plugins.

So the useful question has changed. It is no longer whether an assistant can reach your notes, but what it finds when it gets there: a workspace you built by hand, a list of transcripts, or a memory organized for recall. If the reason you want a second brain is that every new chat starts from zero, look for the third. Mem gets there by letting AI organize what you type; SecondBrain does it from your voice: what you say on your phone is filed by topic, with its events and reminders, and with Pro every assistant you connect reads and adds to the same memory. The setup is covered in how to share one memory between ChatGPT and Claude.

Can you leave later? Export and lock-in

A second brain is a decade-long bet, so check the exit before you move in.

• Plain files from day one: Obsidian, Reflect Open and Logseq OG keep Markdown on your disk.
• Markdown export: Notion, Tana Outliner, Capacities, Anytype, Heptabase, Mem and SecondBrain (Pro, on iPhone, as one .zip with your folders preserved).
• Their own formats: Evernote exports ENEX or HTML, Google Keep goes through Google Takeout, Gemini Notebook exports to Docs and Sheets, Voicenotes to PDF or text.

Whatever you pick, run one export in the first week. If the result opens cleanly somewhere else, you are free to change your mind.

Questions people ask