Byeori
A brain that thinks with you
Free · Designed for iPad. Not verified for macOS.
Beyond notebooks that just store and chatbots that only answer. Your brain surfaces your contradictions, reconnects forgotten ideas, and mirrors who you are.
Byeori isn't a notebook. It's a brain that thinks as you write — and speaks first.
Note apps only store. Chatbots only answer when asked. And in the moment you need it, nothing comes to you. Byeori is different — you just capture, and the brain does the thinking.
■ Mirror — it reflects you back
As you write, the brain draws the gap between who you think you are and what your notes actually say. Not from anyone else — from your own words.
■ Today's Provocation — it names the two voices inside you
"I must be perfect to start," and yet "I only improve by shipping." It surfaces a contradiction you couldn't see, with the exact sentences behind it.
■ Connections that come first — it links before you ask
Forgotten notes, two ideas that quietly touch — the brain surfaces them for you. No search terms to remember.
■ Grounded in your notes, not hallucinations
It extracts atoms (claims, self-descriptions) from your writing, finds opposite polarity on the same concept, and recalls what's semantically scattered. It never speaks without evidence.
■ Near-zero friction to capture
By hand or by voice, the moment it strikes. A one-line journal becomes a habit, and the same brain grows on your phone and on the web.
■ Start today in three sentences
No need to write a lot. Answer three prompts and within minutes the brain speaks to you for the first time. Write more, and new axes open — mood, trajectory, self-gap.
Write → the brain reflects → you write more → the brain deepens.
For everyone who thinks. Wake up your second brain with three sentences today.
Ratings & Reviews
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The developer, WOOCHEOL SHIN, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- User Content
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- WOOCHEOL SHIN
- Size
- 37 MB
- Category
- Productivity
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Korean
- Age Rating
4+
- 4+
- Copyright
- © 2026 Woocheol Shin