Arcseed
iOS · On the App Store · v2.0

ReToU — an emotion diary

Once a day, stamp how you feel.

Pick today's emotion and leave a single line — a seal is stamped on hanji paper for the day. You can only write once a day, which makes each entry count.

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iOSKoreanNo accountiCloud backup

Why

Why once a day?

ReToU is time set aside to face your feelings. Like pressing a seal once a day, the one-entry rule protects the steadiness — and the weight — of each record.

So a single entry means more. Instead of writing quickly and often, you look back on the day slowly and leave it as one seal.

Features

Features

01

Five emotion seals

Joy, weary, even, sorrow, anger — stamped in traditional pigment colors.

02

One entry a day

ReToU's own rule that keeps each record steady and meaningful.

03

Seal calendar (Trace)

A month of feelings, visible at a glance as seal marks.

04

Patchwork Heartlines

A month of emotions stitched together like a patchwork quilt.

05

A letter to you

Not a graph — a short letter the app writes about your month.

06

A year ago today

Record today, and quietly meet yourself from one year ago.

07

Daily reminder

At the time you choose. Never sent on days you've already written.

08

Diary lock

Face ID plus a diary-only 6-digit passcode. On only if you want it.

09

iCloud backup

Your entries follow your Apple account to a new phone. No sign-up.

10

CSV export

Your records are yours — take them out as a file anytime.

Design

Hanji and emotion seals

Five traditional pigments

  • Joy · Gardenia
  • Weary · Gromwell
  • Even · Deep green
  • Sorrow · Indigo
  • Anger · Rouge

You write on hanji — traditional Korean paper with visible mulberry fibers and screen patterns. Each day's seal is pressed at the end of your writing like a classical signature stamp, tilting slightly each time, like a real hand-pressed seal.

Words that hold feelings are set in serif; words you operate with are set in sans. The whole screen becomes a single sheet of hanji, in one soft ivory theme.

FAQ

Frequently asked questions

Can I write more than once a day?

No — ReToU allows one entry per day. Like pressing a seal once a day, this keeps each record steady and meaningful.

Can I edit an entry?

Yes. Tap the day's seal in the Trace calendar, then use the edit button on the detail screen to change the emotion and text freely.

Can I delete an entry?

Yes, from the detail screen. Deleted entries cannot be recovered, so choose carefully.

Can I back up and restore my data?

Yes, from v2.0. Entries back up automatically to the iCloud of the Apple account signed in on your device — install the app on a new phone and your records return. No sign-up needed. You can also export a CSV file from Settings > Data.

How do I set up the lock?

Settings > Lock. Unlock with Face ID, with a diary-only 6-digit passcode as fallback. It's separate from your device passcode, so your diary stays private even on a shared phone.

Won't a daily notification feel like pressure?

You choose the time, and the reminder is never sent on days you've already written. You can turn it off anytime in Settings.

Releases

Release notes

v2.0.0RELEASEDJul 13, 2026

A complete renewal — record on hanji paper, stamp your emotion as a hand-drawn seal.

  • New design 'Hanji & Emotion Seals' — five hand-drawn seals in traditional pigment colors, on textured hanji paper
  • Three tabs — Today · Trace (seal calendar) · Heartlines (patchwork stats and a monthly letter)
  • A year ago today — record today and quietly meet yourself from one year ago
  • Daily reminder — never sent on days you've already written
  • iCloud backup — no sign-up; your entries follow your Apple account to a new phone
  • Stronger, optional lock — Face ID plus a diary-only 6-digit passcode
  • CSV export, Korean traditional month names on the calendar, stats fix for month-end entries
v1.0.2RELEASEDJun 19, 2025

Automatic language translation support.

v1.0.1RELEASEDApr 26, 2025

Improved emotion statistics and added dark mode.

v1.0.0RELEASEDApr 24, 2025

The first release of ReToU.

App info

App name
ReToU (오늘의 넌)
Platform
iOS
Language
Korean (auto-translation supported)
First release
April 2025
Developer
Arcseed

Our promise

  • No sign-up, no login — we collect no personal information
  • Entries live only on your device and in your personal iCloud — no one, including the developer, can access them
  • Face ID and passcode lock use only your device's security features; nothing leaves the app
  • All analysis, including the monthly letter, happens entirely on your device

Contact: contact@arcseed.kr

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