Your External
Brain

SecondYou is a 100% local-first AI that thinks, writes, and speaks like you—because the best person to think with is yourself.

Your Data. Your Device. Your AI.

People are uploading their private notes, emails, and journals to cloud AI, creating a massive privacy and security leak. SecondYou runs entirely on your device using advanced RAG technology over your personal data to deeply understand your tone, thoughts, and style locally. Nothing goes to the cloud, and no data is shared.

It's a "Plaid for Personal Data" connecting with your texts, emails, blogs, social media, and more. Using local LLMs, you can query your own life with no outside influence.

Whether you're searching through 10+ years of digital life or brainstorming your next idea, SecondYou reflects the real you with context-aware responses pulled from your own data.

More than a chatbot—
It's an extension of your identity

External Brain

Query your entire digital life—notes, emails, chats, blogs. A literal extension of your mind that understands your patterns.

Privacy First

Fully local processing means your thoughts never leave your device. Your mind stays yours, always.

Local-First

No cloud dependency, no data sharing. Your AI runs entirely on your device for maximum privacy and speed.

40+ Data Importers

Connect your Google Takeout, WhatsApp, iMessage, Markdown notes, and more. Context-preserving imports across all your data sources.

Identity Extension

Converse with past versions of yourself, tune your mood, or explore how you might think years from now.

Optimized Performance

Dynamic model orchestration designed to run smoothly on varied hardware—even an 8GB RAM ThinkPad.

Your Privacy is Sacred

Built from the ground up with privacy as our foundation, not an afterthought.

Local Processing

Everything runs on your device. No data ever leaves your computer.

Encrypted Storage

Your personal data is encrypted and stored locally with military-grade security.

Zero Cloud Dependency

No accounts, no servers, no tracking. Just pure, private AI assistance.

About

Born from the belief that AI should amplify human intelligence rather than replace it, SecondYou represents a fundamentally different approach to artificial intelligence—one that respects your privacy, understands your uniqueness, and grows with you over time.

Our Mission

To end the insane security risk of uploading your most private thoughts to cloud AI. Privacy is not a feature—it's the foundation of the product.

Our Vision

A world where 60M+ knowledge workers can finally use AI without sacrificing privacy. Starting with prosumers, scaling to enterprises who need air-gapped AI solutions.

Ready to meet yourself?

Join 400+ people on the waitlist.

Your ExternalBrain