01
App Business
We develop and operate mobile apps for sleep and relaxation based on our experience in audio production.
App & music business · Since 2020
White noise apps.
Baby lullabies with Dupamo.
SGTHL has produced music and audio content since 2020. Since 2025, we have also developed and operated mobile apps built on that experience.
2020Founded
2025App business started
2Business areas
01
About
From audio production
to digital services.
Since 2025, SGTHL has developed and operated mobile apps for sleep and relaxation, drawing on its experience in music and audio production.
SGTHL also produces audio for relaxation, sleep, and focus, including lo-fi music, white noise, ASMR, meditation music, and classical music.
02
Business
Expanding our app business and strengthening our music portfolio.
02
Music Business
We plan and produce audio content for relaxation, sleep, and focus.
03
Mobile Apps
Apps by SGTHL.
DUPAMO Cat Care
A gift of sound for your cat.
A gift of music for you.
Five cat-themed music tracks blended with purrs, ten recorded cat sounds, and music for you. Enjoy a quiet moment beside your cat, all without ads.
5 cat-themed music tracks · 10 cat sounds · No ads · Timer & fade-out
Explore the cat music and sounds app
White Noise
White Noise - Tinnitus & Sleep
An app for creating soundscapes for sleep and focus by combining white noise, nature sounds, and classical piano.
Explore the white noise appSound previews →
14 days free, no payment info
Personalized tinnitus sound settings
Custom sound mixing
Timer & fade-out
App Store · Google Play
DUPAMO
DUPAMO Baby Sleep White Noise
An app offering white noise, nature sounds, and classical lullabies for newborn and baby sleep.
Explore the Dupamo baby lullaby app
14 days free, no payment info
White noise & nature
Classical lullabies
DUPAMO character
@sgthl_music
SGTHL on Instagram
The latest three reels from SGTHL’s official Instagram.
Music Distribution
We produce and distribute audio for relaxation, sleep, and focus.
SGTHL distributes music worldwide across more than 100 audio and video streaming platforms.
100+Global audio & video platforms
2022—2026
Global distribution
Top 5 Platforms and Markets
Leading Platforms
- 01
ByteDance
- 02
Facebook
- 03
YouTube
- 04
Amazon.com - 05
7digital
Leading Countries and Regions
- 01China
- 02United States
- 03India
- 04Russian Federation
- 05South Korea
Business Information
- Business name
- SGTHL
- Representatives
- Sang Gul Lee, Tae Hoon Yoo
- Business registration no.
- 293-01-01743
- E-commerce registration no.
- 2026-성남수정-0522
- Business address
- 101, 1F, 1, Nongol-ro 63beon-gil, Sujeong-gu, Seongnam-si, Gyeonggi-do 13138, Republic of Korea
- Support
- Email inquiries: sgthl20@gmail.com