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.

Your standard for a good day slowly shifts as you grow. Noticing that shift helps you rediscover the happiness you've stopped seeing.

The "calendar circle-cross method" I described in my book 'The Mechanism of Happiness' has evolved. I sincerely hope that this app, developed by Saeki โ my former student and happiness researcher โ will help improve the well-being of many people.
Keeping a diary and reflecting on daily life is an effective practice for cultivating psychological richness. Translating psychological knowledge into everyday tools is a challenging endeavor, but Saeki's app shows real promise. I look forward to it enriching many people's lives.
Happiness quietly fades behind habit and assumptions. Knowing your own standard is the surest way to get it back.
No matter how wonderful something is, it turns into "normal" as the days go by โ and the bar for a good day keeps rising without you noticing. Looking back at your records, you'll find "this used to be more than enough." You get to savor, all over again, the happiness that had become invisible.
The bigger something looms in your mind, the smaller its effect on your everyday mood tends to be. Even when you get it, the good days often don't increase as much as you expected. What stays in your records isn't imagination โ it's the things that actually made your days good. You see, as fact, what truly makes you happy.
Without knowing your own standard, all you can do is keep chasing "more." Once you see what actually works and what doesn't, you can spend your limited time and money on the things that truly lead to good days.
Here's how Triad Journal transforms your daily life
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.

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 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.

As your records build up, you can see the difference between your old "good days" and today's.
People quickly get used to good things. And "I'd be happy if only I had that" is often just an assumption โ psychologists call these the hedonic treadmill and the focusing illusion.
So what matters isn't chasing a higher good-day count. It's noticing how your standard changes โ accepting that you change, and choosing the good days that fit who you are now.

โข 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! โข 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. โข I sent a request through the app to make reports printable, and soon after, a PDF export update was added!
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.
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.
Try everything free for a week.
Start Free NowAnswers to your questions

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 Triad Journal app. Supporting your mental care with research-based logic.
Record in 3 seconds, AI analyzes.
Notice how your idea of a "good day" shifts and
find the happiness that fits who you are now.