Sejinsa
Category: AI in Supply Chain / Logistics
Korean mobile car-wash subscription platform expanding into AI-powered vehicle condition diagnosis and on-site maintenance. Sejinsa was founded in 2023. The company is led by Yoon Yong-bin (윤용빈). Based in Seoul, South Korea. Team size: 1-10. Total funding raised: $1.1M. Latest round: Seed. Key investors include Hashed Ventures (해시드벤처스), Seoul National University Technology Holdings (서울대학교기술지주).
- Founded
- 2023
- Headquarters
- Seoul, South Korea
- Team size
- 1-10
- Total funding
- $1.1M
Value proposition
Doorstep car-wash subscription ("car wash + maintenance") where a professional crew visits the customer's parking spot; the app now adds AI-driven vehicle condition diagnosis reports and on-site light maintenance (engine oil, battery, tires) — turning recurring car washes into a continuous vehicle-care data loop.
Products and solutions
Sejinsa app (세차에 진심인 사람들): on-demand/mobile car wash subscription (monthly, bi-monthly, one-off), on-site light maintenance (engine oil, battery, tire replacement), add-on services (glass coating, water-repellent coating, interior disinfection, bug/tar removal), post-wash vehicle condition diagnosis report, AI vehicle-condition identification model and personalized maintenance recommendation system (under development via TIPS).
Unique value
Recurring car-wash touchpoints generate repeat vehicle image + work-history data, enabling AI vehicle-condition identification and personalized maintenance recommendations without installing any diagnostic hardware.
Target customer
Vehicle owners in apartment/office complexes in Seoul, Gyeonggi and Incheon; subscription-oriented urban car owners.
Industries served
Automotive / Mobility, On-demand services, Vehicle maintenance & car care
Technology advantage
Proprietary dataset from 60,000+ cumulative car washes and 4,000+ crew; AI vision model that identifies exterior damage, tire wear, engine-oil leaks and battery status from smartphone photos taken during washes — no dedicated diagnostic hardware required. Recurring wash cadence enables longitudinal per-vehicle condition tracking.
How they differentiate
Combines a high-frequency car-wash subscription (data acquisition engine) with AI condition diagnosis and on-site maintenance in one app — versus competitors focused on wash-only or self-wash booking. Uses existing wash operations to accumulate vehicle data rather than requiring separate diagnostic devices.
Main competitors
오토스테이 (Autostay, self/auto wash booking, Series A ~₩8B), 오토카지 (Autokaji, on-site wash + vehicle inspection, Series A ~₩1B), 팀와이퍼 (Team Wiper / YPER, hand-wash on-demand, Series A ~₩600M), also 세차왕, 갓차모빌라이즈
Key partnerships
Seoul National University Technology Holdings (investor + TIPS operator), TIPS program (Ministry of SMEs and Startups) — ₩800M R&D over 2 years, Korea Credit Guarantee Fund (KODIT) 'Little Penguin' program, KODIT 'Start-up NEST' 18th cohort, MOU with Songpa Senior Club and Gwanak/Seodaemun 50+ Centers for senior employment (crew training).
Notable customers
B2C vehicle owners in Seoul/Gyeonggi/Incheon (60,000+ cumulative car washes as of Sep 2026)
Major milestones
2023-06 founded (as 더블유오토케어앤테크), 2023-08 launched mobile car wash service, 2025-03-31 renamed to 세진사, 2025-08 selected for KODIT 'Start-up NEST' 18th cohort, 2025-11 selected for KODIT 'Little Penguin', 2026-02 MOU with Songpa Senior Club, 2026-10 secured bridge investment from SNU Technology Holdings and selected for TIPS (₩800M R&D).
Growth metrics
60,000+ cumulative car washes (Sep 2026); 4,000+ service crew; 5 employees (Aug 2026); service area Seoul + Gyeonggi + Incheon (expanding)
Market positioning
Early-stage Korean O2O car-care platform transitioning from mobile car wash to an AI vehicle-management data platform; backed by SNU Technology Holdings and Hashed Ventures, TIPS-selected.
Geographic focus
South Korea (Seoul metropolitan area — Seoul, Gyeonggi, Incheon)
About Yoon Yong-bin (윤용빈)
Founder-CEO of Sejinsa; part of a Seoul National University (SNU)-affiliated founding team. (Detailed prior corporate history not publicly disclosed.)
Latest news about Sejinsa
More AI in Supply Chain / Logistics companies
Official website: https://sejinsa.co.kr/