SecondBrain · Blog
The SecondBrain blog
How to build a second brain that works from your voice, how the apps compare, and how to give ChatGPT, Claude and Gemini a memory that belongs to you. Written by Federico Cesarini, who builds SecondBrain.
What is a second brain? The definition, the methods, and what AI changes
A definition you can quote, where the idea comes from, Tiago Forte's CODE and PARA in plain words, why most second brains get abandoned, and a 15-minute way to start.
The best second brain apps in 2026, by how you actually capture
Fifteen apps grouped by how ideas reach them: spoken, written, structured or studied. Free plans, prices and ChatGPT or Claude access, checked against each vendor's own pages.
How to use ChatGPT as a second brain, and what it still forgets
What ChatGPT's saved memories, chat history and Projects really keep, a 10-minute setup that makes it useful, and the gaps you fill with a memory of your own.
How to turn voice memos into organized notes on iPhone and Android
What iPhone and Android already transcribe for free, why a transcript is not a note, how to speak a memo that files itself, and a two-minute workflow.
Secondo cervello digitale: cos'è, da dove nasce e come costruirlo parlando
Cos'è un secondo cervello, da dove nasce l'idea (dallo Zibaldone di Leopardi al metodo PARA), perché tanti lo abbandonano e come iniziare parlando.
Guides
Step-by-step pages for the questions people ask us most.
- How to share one memory between ChatGPT and ClaudeWhy assistants cannot share memory natively, and how to connect them to one memory over MCP.
- Claude memory import: move your ChatGPT memoryClaude's built-in import step by step, how to export Claude's memory, and how to keep both in sync.
- What is an MCP memory server?A plain-English guide to MCP memory servers, with managed and self-hosted options compared.
- Voice-first second brain apps: the 2026 comparisonSecondBrain, Voicenotes, TellDone, Mem, Tana, Reflect, Notion and Obsidian, compared honestly.
- Memoria permanente per ChatGPT e Claude (in italiano)La guida italiana alla memoria AI condivisa via MCP.
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Just talk. SecondBrain remembers.
Free to start on iPhone, Android and the web. Speak once and it writes the note, files it and sets any reminder you ask for.