# Chosim: 21-Day Habit Keeper — Build one routine that sticks

> Build one routine that sticks (iPhone/iPad app by junhyeong Park.)

- Source: https://appshunter.io/ios/app/chosim-21-day-habit-keeper/id6818934076 (this page in markdown: same URL + `.md`)
- Developer: [junhyeong Park](https://appshunter.io/developer/6812603622)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 42 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2026-10-07
- Data updated: 2026-10-26

## What is Chosim?

Plenty of apps break a goal into small steps. Chosim adds a time and a voice: at the moment you set, last-night you wakes you up.

Pick one goal and one target time. Chosim lines up tiny wins before it like dominoes, five minutes apart. Tip each one over within 10 minutes, and your 21-day gauge climbs toward 100%.

■ LAST-NIGHT YOU WAKES YOU UP
· Each night, write one line to tomorrow's you.
· The next day at the set time, "Last-night me" sends that line to your Lock Screen.
· Tap "Done" right from the notification. No need to open the app.

■ DOMINOES YOU TIP WITHIN 10 MINUTES
Goal: Wake up early · Target time: 6:30 AM
6:15 Turn off the alarm and sit up → 6:20 Open the window → 6:25 Drink a glass of water → 6:30 Wake up early
· Each step fills only if you "Hold to complete" within 10 minutes of its time.
· A missed step stays at 0.
· You can edit the dominoes to fit your day.

■ 21 DAYS = 100%
· The whole 21-day journey is 100%. A full day adds about 4.8%.
· Each day's share is split across the dominoes. They start small and grow, and the goal itself counts the most.
· Even after all 21 days, any missed step keeps you below 100%. That's what makes 100% mean something.
· Up to three rest days per goal. A rest day fills that day's share.

■ THE RULES
· If you don't respond to notifications for three days in a row, the journey stops.
· Up to three goals at a time.
· When you finish, read back every line you sent yourself over the 21 days.

■ PRICING: A SMALL PRICE FOR WILLPOWER
· Try your first habit free for two days.
· To keep going, pay once per goal (21 days). It's not a subscription.
· Another 21 days works the same way.

■ YOUR DATA STAYS ON THIS DEVICE
No account needed. Your goals and notes are stored only on your phone. The only exception: a goal you choose to share with a watch link is uploaded so people with the link can see it (turning the link off deletes it).

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 목표 하나 만들기 (21일) | $0.99 | one-time |
| 이틀 무료 체험 (2-Day Trial) | Free | one-time |


## Is Chosim safe?

Not enough ratings yet to assess Chosim.

## Is Chosim legit?

Chosim: 21-Day Habit Keeper appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Chosim is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 1.1.0 — 2026-10-17

Send your pledge as a link — friends can follow your progress and cheer you on without the app. Add a proof photo to the steps you finish today (it's deleted the next day). Clearer rules and polished translations.

### 1.0.1 — 2026-10-08

New: tiny wins now line up like dominoes before your target time. Hold to complete each within 10 minutes and fill your 21-day gauge toward 100%. Now in 9 languages.

### 1.0 — 2026-10-07

No release notes.

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## More apps by junhyeong Park

- [Wanderlure: Walk the Unknown](https://appshunter.io/ios/app/wanderlure-walk-the-unknown/id6812606367)
- [Niblore: Write Your Novel](https://appshunter.io/ios/app/niblore-write-your-novel/id6812610681)

All apps by junhyeong Park: https://appshunter.io/developer/6812603622

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-26.*