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Chapter 01 · Wellness

Kokoro Jar

A quiet jar for whatever your day felt like.

Not every day needs a productivity streak. Some days just need a soft place to rest.

  • One-tap mood stickers
  • Monthly jar + calendar view
  • Gentle optional reminders
  • 100% on-device storage

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Feelings deserve a place to land.

Not every day needs a productivity streak. Some days just need a soft place to rest.

Kokoro Jar started from a simple truth: mood apps often push you to perform wellness. We wanted the opposite — a jar you open, drop a feeling into, and close again.

Pick a sticker. Add a note if you want. Watch the month gather into glass. No feed. No judgment. No “don’t break the chain.”

Your journal never leaves the phone. Offline first. No account. Just you and the quiet habit of noticing.

Privacy policy

Last updated October 4, 2026

Mood entries stay on your device. We don’t need an account to hold your day.

  • Journal data is stored locally — not synced to Dupercuper servers.
  • No account required for core journaling.
  • Ads may appear via Google AdMob; Google may use device identifiers for ad delivery.
  • Reminders are optional and fully under your control.
  • Limit ad personalization anytime in device settings.

Ads partner reference: How Google uses information. Contact patrick.sqp@gmail.com.