Stealien
Track on RadarKorean firm offering mobile app security products, cyber drill training, and pentesting.
- Total raised
- —
- Employees
- 51
- Founded
- 2015
- Momentum
- 40
Cooling
Data updated August 2026
About
About Stealien
At a glance
Stealien is a cybersecurity company specializing in Application Security, founded in 2015 and headquartered in Seoul, South Korea. It employs about 51 people and is privately held.
Stealien (스틸리언) is a South Korean cybersecurity company founded in 2015, headquartered in Seoul (Yongsan-gu), with additional offices in Japan (Tokyo) and Indonesia (Jakarta). The company's name is derived from the phrase "we STEAL ALIEN technology," reflecting a self-described ethos of working at the cutting edge of security research. The company's primary product line is the AppSuit Series, a suite of mobile application security solutions. AppSuit encompasses multiple modules, including AppSuit Remote Block, AppSuit Anti-Capture, AppSuit WBC (White-Box Cryptography), AppSuit AV (Anti-Virus), and AppSuit Keypad — all of which have received GS (Good Software) Grade 1 certification from Korean authorities. These products are designed to protect mobile applications against reverse engineering, tampering, screen capture, and other threats. In addition to mobile app security products, Stealien operates a Cyber Drill System — a platform for cybersecurity training, hacking education, and competition management. The company also provides security consulting services, including penetration testing conducted from an attacker's perspective, as well as cybersecurity R&D conducted in collaboration with government agencies and research institutions. Stealien holds ISO 27001:2022 and ISO 27001:2013 certifications, and has been recognized multiple times by South Korean government bodies including the Ministry of Science and ICT and the National Intelligence Service. The company has been named an Asia-Pacific high-growth company by the Financial Times three consecutive years (2022–2024). It holds multiple Korean, Japanese, and Indonesian patents related to its security technologies.
Momentum
How Stealien is trending
Momentum score
Score history appears once we have at least two monthly snapshots.
Pillar breakdown
Pillar breakdown locked
Growth, Market & Financial sub-scores
Valuation
What Stealien is worth
Estimated valuation
Products
Stealien's products
Funding
Funding history
See every round, lead investor, and the full capital stack.
Open the full profile on Mandos to see funding history.
Public markets
Stock performance
Privately held
This company isn't publicly traded. Stock performance will appear here after an IPO.
Headcount
Headcount growth
Track hiring velocity, department mix, and seniority shifts.
Open the full profile on Mandos to see headcount growth.
Jobs
Open jobs
Every live posting, hiring pace, and role-level signal.
Open the full profile on Mandos to see open jobs.
Web traffic
Digital presence
Visits trend, bounce rate, engagement, and top countries.
Open the full profile on Mandos to see digital presence.
Tech stack
Technologies
The full stack behind the product — frameworks, clouds, security.
Open the full profile on Mandos to see technologies.
M&A
Acquisitions
Every acquisition this company has made, with dates and amounts.
Open the full profile on Mandos to see acquisitions.
Reviews & sentiment
Employee & product reviews
CEO approval, culture, comp, and detailed product ratings.
Open the full profile on Mandos to see employee & product reviews.
Leadership
Full leadership team
CEO, CxOs, VPs, and every exec with roles.
Open the full profile on Mandos to see full leadership team.
Competitors
Competitive landscape
The complete competitor set with overlap and positioning.
Open the full profile on Mandos to see competitive landscape.
News
Press & news coverage
The most recent mentions, announcements, and media coverage.
Open the full profile on Mandos to see press & news coverage.
Full profile
This public profile is a snapshot
The full Mandos profile of Stealienadds funding rounds & investors, valuation estimates, headcount & hiring trends, technology stack, executive moves, and real-time monitoring.
FAQ
Frequently asked questions about Stealien
When was Stealien founded?▾
Stealien was founded in 2015.
Where is Stealien headquartered?▾
Stealien is headquartered in Seoul, South Korea.
Is Stealien public or private?▾
Stealien is a privately-held company.
How many employees does Stealien have?▾
Stealien has approximately 51 employees.
What does Stealien do?▾
Stealien (스틸리언) is a South Korean cybersecurity company founded in 2015, headquartered in Seoul (Yongsan-gu), with additional offices in Japan (Tokyo) and Indonesia (Jakarta). The company's name is derived from the phrase "we STEAL ALIEN technology," reflecting a self-described ethos of working at t…