Become someone who can
intentionallycreate good days
Transform your daily happiness
from chance to something you can control.
Changes You'll Experience
Here's how your daily life will transform with this app
Your Current State
- Going through days without much thought
- Having good and bad days without knowing why
- Not fully understanding yourself
Where the App Takes You
- Understanding your emotional patterns
- Knowing what creates a "good day" for you
- Intentionally incorporating those conditions into your life
Your Growth Stages
Your growth journey with 3-Choice Diary
Stage 1: Building the Habit
First, form the habit. 3 seconds, 3 choices - no giving up.
Stage 2: Know Yourself
Discover your values, strengths, and personality. "So this is who I am."
Stage 3: Recognize Patterns
See trends in your "good days" and "bad days." AI provides hints.
Stage 4: Create Intentionally
Know the conditions for good days and incorporate them into your life.
Your App Experience
Here's how 3-Choice Diary transforms your daily life
Build a Lasting Habit
Just 3 seconds a day. Simply choose "Good day," "Okay," or "Bad day." No wondering what to write. Zero guilt for skipped days. First, build the habit of recording itself.
Deeply Know Yourself
From continuous records, AI analyzes your values, strengths, and personality. Schwartz Theory, VIA Character Strengths, Big Five. Gain deep self-understanding based on psychological research.
Daily Insights Support
Daily reports help you reflect on your emotions and their context. "Why was today a good day?" "What made it just okay?" A journaling experience with insights, not just writing.
Tips for More Good Days
As records accumulate, your unique "good day patterns" emerge. What days bring satisfaction? What tends to lower your mood? Let's discover tips for more good days together.
User Reviews ✨
An App That Deserves More Popularity
• You can just pick from 3 choices, or write freely - you can use it however you feel that day, so even I, who gets bored easily, can keep using it! • The review reports come weekly, monthly, plus special reports. Recently I received a Self-Care Report and was amazed by its content. It was a week when something sad happened that I didn't want to talk about with anyone, but the report addressed it with such heartfelt content. • I sent a request through the app to make reports printable, and soon after, a PDF export update was added!
— Sakura (Woman in 20s)
Exactly What I Wanted
I think even easily-bored people can keep using this diary. When sleepy or unmotivated, you can just pick your mood from 3 choices - that's great. Personally, my favorite point is the carefully crafted UI. No ads, user-friendly, and I really love the calm atmosphere.
— Azusa (Woman in 20s)
Accurate Advice
The app gives faithful and accurate comments based on what I wrote, which makes me want to continue. Plus, the comments are gentle with no harsh advice, making it easy to open up completely.
— Hana (Woman in 20s)
Frequently Asked Questions
Answers to your questions
Masao Saeki
Ph.D. A researcher in psychology and behavioral science, engaged in research on happiness and cognition. With a mission to "turn academic insights into tools everyone can use daily," he developed the 3-Choice Diary app. Supporting your mental care with research-based logic.
Awards
- Securities Analysts Journal Award (May 2015)
- Behavioral Economics Society Encouragement Award (December 2013)
Toward a life where you
intentionallycreate good days
Record in 3 seconds, AI analyzes.
Find your "good day" patterns and
make every day happier.