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Product

HYSS365 — Your Personal Main Memory

A personal storage device that captures the flow of your thoughts, decisions, and actions, and connects them to AI to help you understand yourself more deeply.

Key Features

Thoughts disappear in an instant

An idea that just crossed your mind, something to handle today, a note you'll want to revisit later — HYSS365 is built to catch it before it's gone.

Save it the moment it comes to mind
Pick a category and start typing right away. No complicated setup — done in 3 seconds.
Keep today's tasks separate from someday's
Today for what needs handling now · Someday for what you'll come back to later. They're automatically separated so nothing gets mixed up, and you can move items between them anytime.
Hand it straight to AI
Copy your selected notes as a whole and paste them right into ChatGPT, Claude, or any AI you use. Just ask things like "organize these notes" or "find the patterns."
Search, then select instantly
Find notes by keyword, then select them all at once with checkboxes to delete or copy for AI.
Back up, restore anytime
Export everything you've recorded as plain text, and load it all back in whenever you need. All data stays on your device and is never sent externally.
Full Korean · English support
Buttons, notifications, and guidance text all switch fully to match your chosen language.

Who is this for?

  • Anyone who wants to capture thoughts the moment they arise
  • Anyone who wants to keep tasks and ideas separate instead of mixed together
  • Anyone who wants to organize and use their notes together with AI

For a more detailed guide, visit hyss.kr/guide.

Screen Overview

Capture in Today, find it again in Someday

Whatever you didn't finish today moves to Someday, and whatever becomes relevant again moves back to Today — your records stay naturally organized as you move between the two screens.

🌐 One-tap KOR/ENG toggle · Global UI Support
Today screen — instant category-based entry
Today — an intuitive main layout with instant, category-based entry
Someday screen — search, AI copy, backup
Someday — a one-tap control center for search · AI copy · backup/restore
10 Core Categories

Every record falls into one of 10 areas

01
Inbox
Raw, unsorted data before you organize it
02
People
Relationships, contacts, appointments, network
03
Money
Income & expenses, financial goals, repayment schedule
04
Time
Timelines, dispatch schedules, time blocking
05
Work
Work logs, projects, legal & administrative matters
06
Thoughts
Ideas, emotional journaling, reflections
07
Knowledge
Reading notes, learning, tips on using AI
08
Health
Blood sugar, blood pressure, sleep, weight, exercise
09
Belongings
Devices you own, assets, product development
10
Records
Administrative & legal documents, backup files
Security & Architecture

Your memories belong to you — never sent to a server

A single-file architecture means the app runs instantly without a network connection, and connects to AI only when you choose to.

Fully offline-first
HTML, CSS, JavaScript, and all data logic are condensed into a single file, so the app works instantly even without a network. Your personal data is never sent to an external server.
Multi-device hybrid
Use an iPad as your main hub and for full backups, a 13-inch device for your daily timeline, and mobile for real-time capture on the go plus cloud backup.
v37 stability standard
Null Guard and try-catch Exception Shield proactively block errors, so your records are never lost — even in cases of missing input or save failures.
UI Specifications

Interface Specs

Title FontFixed at 32px for readability
Main Tab DesignIntuitive Capsule UI
Container LayoutMax width 600px (optimized for mobile, iPad, and tablets)
Multilingual SupportOne-tap Korean/English toggle for global users
A Note from the Developer

To My Beloved Sons

Since September 2022, I've borrowed 408 books from the library, and over the past six months I've added 183 e-books to my digital shelf. Yesterday I tried 15-minute scan-reading for the first time, and before I knew it, two hours had passed and I'd gotten through five books. It wasn't the number of books that mattered — it was the joy of discovering new connections and ideas along the way. This idea started with your grandfather. He kept books close his whole life, and when his eyes began to fail, he turned to audiobooks. Watching him, I realized reading is something you have to prepare to carry with you for life. That's the same reason I'm leaving these records in HYSS365. I hope that someday, when you need it, the lessons I learned through trial and error can be a shortcut for you. Knowledge isn't about knowing a lot — it's about building a system for learning for life.
— Dad