UnderTree AI Journal
& Self-Care Pet App
Record small sparks, track your mood, and turn messy thoughts into gentle reflections with Mochi, your emotion-aware virtual pet.
Available on iOS and Android

A Gentle Mental Wellness App for Daily Reflection
AI Journaling
Capture small "Sparks" of joy or "Golden Hours" through simple, guided AI chats. No pressure, no blank page.
Self-Care Pet Companion
Mochi senses your moods, explores the world when you're in bloom, and brings back gentle souvenirs for the soul.
Privacy First
No accounts, no ads. Your inner forest is your private sanctum — encrypted and stored only on your device.
Mood Tracker Reflections
Your messy thoughts become private diary entries with emotional patterns you can revisit over time.
A Personal Note from the Creator
I built UnderTree not just as a developer, but as its very first resident. Like many of you, I've had those long nights where my thoughts felt too heavy and the world felt too loud. I needed a sanctuary where I could simply be — without judgment, without social pressure, and without noise. I wanted a companion to grow with, so I created Mochi, and planted this digital tree.
My only hope is that UnderTree can offer you a sliver of light. I want you to feel heard, seen, and nurtured, even in your quietest moments of exhaustion.
There is a quiet wish I hold: If the day comes when you no longer open this app, I won't be sad. I'll be proud. Because it means you've found the strength to stand on your own. It means you've become your own forest, and you no longer need the shade of this tree to feel safe.
Until then, UnderTree is here. Let's grow, one “Seed of Hope” at a time.
The UnderTree Team 🌿
Easy Start
No login required. Start your self-care journey with just one tap.
Private AI
US-based AI models. No data retention, no model training on your thoughts.
Zero Tracking
No ads, no third-party trackers. Your sanctuary is yours alone.