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Leesol

Category: AI in Healthcare

A sleep-tech and neurostimulation platform that utilizes patented Cranial Electrotherapy Stimulation (CES) and AI to improve sleep quality, reduce stress, and prevent cognitive decline. Leesol was founded in 2017. The company is led by Seungwoo Lee, Guseong Kwon. Based in Seoul, South Korea. Team size: 10-50. Total funding raised: $3.3M. Latest round: Series A. Key investors include ["Vine Ventures","Kolon Pharma","New Paradigm Investment","Korea Alternative Investment Asset Management","FindUs","Korea University Holdings"].

Founded
2017
Headquarters
Seoul, South Korea
Team size
10-50
Total funding
$3.3M

Value proposition

Offers a non-invasive, drug-free alternative to sleep medication by using micro-currents to synchronize brainwaves and stabilize the Default Mode Network (DMN), resulting in faster sleep onset and deeper rest.

Products and solutions

["Sleepisol (Original wearable device)","Sleepisol Plus (Enhanced neurostimulation features)","Sleepisol Lite (Portable, cost-effective consumer version)","Sleepisol Bio (Device with integrated bio-signal monitoring)","Sleepisol App (AI-driven sleep tracking and personalized therapy recommendations)"]

Unique value

Unlike standard sleep trackers that only monitor data, Resol’s technology actively intervenes in brain activity using proprietary brainwave synchronization (tACS/CES) to induce physiological changes in sleep patterns.

Target customer

Individuals suffering from chronic insomnia or sleep disorders, people with depression and anxiety, professional athletes seeking mental recovery, and the elderly focusing on dementia prevention.

Industries served

["Sleep-tech","Digital Therapeutics (DTx)","Healthcare & MedTech","Wellness & Personal Care","Senior Care & Dementia Prevention","Sports Technology"]

Technology advantage

Founded by medical industry veterans and academics from Korea University and KAIST, the company possesses miniaturized medical-grade CES tech into a user-friendly wearable, backed by clinical data showing a 170% improvement in sleep and depression metrics compared to conventional methods.

How they differentiate

Unlike passive sleep trackers, Resol utilizes proprietary Cranial Electrotherapy Stimulation (CES) and Transcranial Alternating Current Stimulation (tACS) to actively synchronize brainwaves, inducing physiological sleep states and stabilizing the Default Mode Network (DMN).

Main competitors

["Asleep (에이슬립)","Fisher Wallace","Eight Sleep","Flow Neuroscience"]

Key partnerships

["Seoul National University Bundang Hospital (Clinical trials on sleep and cortisol management)","Eisai Korea (Strategic collaboration for senior brain health and dementia care)","Kolon Pharma (Investment and pharmaceutical distribution network)","Setoworks (Global marketing and distribution for US and Japanese markets)","Next Creative (Sports mental care management and marketing)"]

Notable customers

["Eisai Korea (Strategic collaboration for dementia care)","Seoul National University Bundang Hospital (Clinical trial partner)","Setoworks (Global distribution partner)"]

Major milestones

["Series A funding of 4B KRW secured in Oct 2024","Winner of CES 2025 Innovation Award (Sleepisol Lite)","Google Play 'Best of 2025' Award for 'Sleepisol Bio' (Best Watch App)","Selected for 'Baby Unicorn 2024' by the Ministry of SMEs and Startups","Selected for the 1.7B KRW 'Deep Tech TIPS' program by the Korean government"]

Growth metrics

Reached cumulative private investment of 4.5 billion KRW; secured additional government R&D grants totaling approx. 1.7 billion KRW via Deep Tech TIPS.

Market positioning

A medical-tech bridge between consumer sleep wearables and clinical digital therapeutics (DTx) for sleep, depression, and dementia prevention.

Geographic focus

South Korea, United States, Japan

Patents and IP

Holds over 50 domestic and international patents related to neurostimulation, brainwave synchronization, and personalized electrical therapy algorithms.

About Seungwoo Lee, Guseong Kwon

Seungwoo Lee is a Professor at Korea University (Department of Integrative Energy Engineering) and an expert in brainwave synchronization technology. He holds a Ph.D. in Materials Science from KAIST and was a Visiting Scholar at Harvard University's Wyss Institute. Guseong Kwon is a co-founder and joint CEO who leads business strategy, global marketing, and design-led innovation, recently securing major international awards and government recognitions.

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