Sumbi - Study Focus Timer
Digital Detox & Screen Time
Only for iPhone
Free · In-App Purchases
iPhone
The longer you put your phone down, the deeper your life gets.
Start the timer, set your phone down, and sea creatures come to your ocean.
From exam prep to digital detox, dive with Sumbi.
Sumbi is a study focus timer and digital detox app named after the "sumbisori," the whistling breath of Jeju haenyeo, Korea's legendary free-diving women. Start a dive when you want time away from your phone. While your phone rests, your ocean deepens, and sea creatures come to live in it.
Who dives with Sumbi
- Students who need a study timer for exams and deep focus
- Anyone fighting phone addiction or doomscrolling
- People who want to cut screen time and rebuild concentration
- ADHD brains that need a gentle, visual reason to stay off the phone
- Anyone who just wants to watch a calm ocean and breathe
What makes Sumbi different
1. One dive = one focus session. Keep your phone down while the timer runs, and the dive succeeds. If you fail, nobody scolds you.
2. Your focus time becomes an ocean. Successful dives bring creatures from shallow water, deep water, even the abyss.
3. Collect and raise your sea creatures. The more you dive, the wider and deeper your ocean grows.
4. Gift creatures to your dive buddies. Focus is deeper together.
5. No ads, no noise. Sumbi never drags you back with notifications. Coming back is your choice.
Study timer, pomodoro, or deep work
Pick any length with the dial: a short pomodoro-style session or hours of exam prep. Every dive adds to your daily focus record.
When haenyeo divers surface, they release a long whistling breath: "hooo-ee." Your day deserves a breath that deep. Have a good dive. Hoo-ee!
Contact: sumbi@niceday.io
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
The sea is a little calmer now
· Tap the water on My Sea and Haenyeo styling to send up little bubbles
· Fixed stuttering when switching screens on Android
· Small polish and fixes
The developer, 나이스데이, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- niceday Co.,Ltd.
- Size
- 98.6 MB
- Category
- Productivity
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later.
- iPhone
- Languages
English and 2 more
- English, Japanese, Korean
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Abyssal Creature USD 2.99
- Deep Sea Creature USD 1.99
- Shallow Sea Creature USD 0.99
- Copyright
- © 2026 sumbi. niceday Inc.