Lemontree
Lemontree (레몬트리) operates Firfin (퍼핀), a South Korea–licensed family fintech platform providing a prepaid debit and transit card, parental allowance controls, and 2,000+ financial-education quizzes for children aged 7+, with recent extensions into parent-supervised investing and family wealth services.
- Company typePrivate
- Founded2021
- HeadquartersSeongnam, South Korea
- Headcount11–50
- GTM typeB2C
- OfferingSoftware
What Lemontree does
Lemontree Inc. (레몬트리), operating under the brand Firfin (퍼핀), is a South Korean fintech company that has built a vertically integrated family financial platform targeting children aged 7 and older and their parents. Founded in July 2021 by CEO Lee Min-hee, the company received an Electronic Financial Business license from Korea's Financial Services Commission in January 2023 and launched Firfin in March 2023. The core product is a prepaid debit card (issued without requiring a bank account or branch visit, via app-based phone authentication) that combines payment functionality at all KB Kookmin Card merchants nationwide with embedded Rail Plus transit card capability, barcode payments with up to 5% cashback, and a parent control dashboard supporting daily/monthly limits, instant and recurring allowance transfers, real-time transaction monitoring with photo capture, and remote card lock. The Firfin app is split into a parent app and child app, and is augmented by Firfin World — a gamified financial education content hub with 2,000+ economics and finance quizzes plus a $2,000 virtual US stock portfolio. More recent additions include Firfin Investment (parent-supervised stock trading via Shinhan Investment Securities CMA accounts, launched January 2026), Firfin Convenience Store (gifticon marketplace), Firfin Plus membership subscription, KFQA — Korea's first recognized children's financial literacy assessment co-developed with Maeil Business Newspaper — and Rich Pass (March 2026), an integrated family wealth service extending into minor stock account opening, proxy trading, gift tax planning, and Hometax self-filing.
Lemontree's business model is a freemium-plus-interchange combination. The core card and app are free (no issuance fee, monthly fee, or allowance transfer fee), driving rapid top-of-funnel acquisition (200,000+ users and 70,000+ cards within roughly a year of launch). Revenue is generated through (1) Firfin Plus subscription (monthly/annual access to premium content, with a 2026 refund policy tied to actual quiz usage at ₩2,000 per unit), (2) interchange share from card swipes and barcode payments processed via KB Kookmin Card, (3) gifticon sale margins in the Firfin Convenience Store, and (4) referral-program acquisition costs. The company has raised approximately ₩10.8 billion (~$8M) cumulatively across a 2021 seed round (₩5B from KB Investment, SpringCamp, Capstone Partners, TVT Partners, Base Investment, Fast Ventures, D.Camp) and a July 2024 Pre-Series A (₩2.3B led by Kakao Investment). Go-to-market is product-led: self-serve onboarding via Google Play, word-of-mouth, a friends-referral program paying ₩2,000 in Firfin points per invite, and co-marketing with major Korean partners.
Lemontree's regulatory perimeter (FSC-licensed electronic financial business), core infrastructure dependencies (KB Kookmin Card for processing, Hana Bank for trust deposits, Shinhan for brokerage, Korail/Rail Plus for transit), and content library create a defensible position in the Korean kids-fintech niche. The company is single-country (South Korea), employs 11–50 people, and operates from Seongnam (Bundang district). Strategic direction points toward becoming a regulated family finance super-app spanning card, education, investment, and tax services, with potential future expansion into adjacent youth lifestyle verticals via partnerships.
Lemontree firmographics
Firmographics- Name
- Lemontree
- Legal name
- 주식회사 레몬트리 (Lemontree Inc.)
- Website
- https://firfin.family
- Company type
- Private
- Founded year
- 2021
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Lemontree (레몬트리) operates Firfin (퍼핀), a South Korea–licensed family fintech platform providing a prepaid debit and transit card, parental allowance controls, and 2,000+ financial-education quizzes for children aged 7+, with recent extensions into parent-supervised investing and family wealth services.
- Ownership category
- akta.pro rank
Lemontree industry classification
Industry- Product category
- Kids Fintech
- NAICS
- Credit Card Issuing (52221), Activities Related to Credit Intermediation (5223)
- SIC
- Personal Credit Institutions (6141)
- akta.pro primary industry
- Embedded Card Issuing & Card-as-a-Service (FSAGALAC)
- akta.pro secondary industries
- Prepaid Card Program Managers & Issuers (BIN Sponsors) (FSAMANAK), BaaS Platforms & Sponsor Bank Enablement (FSAGALAA), BNPL Consumer Apps & Wallets (Discovery, Management) (FSAGAIAG)
Keywords
Where Lemontree is headquartered
LocationHeadquarters
- HQ city
- Seongnam
- HQ country
- South Korea
- HQ region
- Asia
Offices1 record
Markets served
Lemontree business model
Business model- GTM type
- B2C
- Offering type
- Software
- Cost components
- Technology or R&D, Personnel, Marketing or Sales, Operations
Revenue model
- Plus Membership Subscription: Premium subscription service offering unlimited access to exclusive educational content, bonus quizzes, book events, and special benefits. Billed on a monthly or annual cadence.
- Transaction Interchange: Revenue share from payment transactions made with the Firfin card at KB Kookmin Card merchant terminals. A portion of the interchange fee from each card swipe and barcode payment flows to Lemontree.
- Firfin Convenience Store (퍼핀머니샵): Online shop where children purchase gifticons (CU, GS25, McDonald's, Olive Young, etc.) using their Firfin money balance. Lemontree earns margin on gifticon sales.
- Referral Program: Users invite friends and both receive 2,000 won in Firfin points. This drives user acquisition at a defined cost per acquired user.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Monthly | Free tier with core allowance management features |
| Subscription | Monthly | Plus Membership (퍼핀 플러스) |
| Unit Pricing | Pay-as-you-go | Firfin Money Shop gifticons |
Go-to-market motion1 record
Distribution channels3 records
Marketing channels5 records
Lemontree product offering
Product offeringCore offering
Lemontree operates Firfin (퍼핀), a family financial platform providing prepaid debit and transit cards for children aged 7+, paired with a mobile app for allowance management and parental controls. The platform combines spending tools, real-time transaction monitoring, and 2,000+ gamified financial education quizzes, plus parent-supervised investment services through Shinhan Investment Securities.
Product overview
Lemontree operates Firfin (퍼핀), a unified family financial platform composed of multiple integrated products and modules. At its core is the Firfin App and the Firfin Card — a prepaid debit and transit card for children aged 7+ that enables allowance management, spending controls, barcode payments, and real-time parental monitoring. The platform is augmented by Firfin World, a gamified financial education content hub with 2,000+ economics quizzes; Firfin Investment, a parent-supervised stock investment feature backed by Shinhan Investment Securities; and the premium Firfin Membership (퍼핀 플러스) add-on offering exclusive content and promotions. A notable addition is 부자 패스 (Rich Pass), an integrated service for family wealth management including minor stock accounts, proxy trading, gift tax planning, and Hometax filing. The company also developed the 한국금융이해력평가 (KFQA), Korea's first recognized financial literacy assessment for children, offered in partnership with Maeil Business Newspaper. The platform is built on partnerships with KB国民Card (payment processing), Rail Plus (transit card), and Shinhan Investment Securities (brokerage), and is regulated as an official electronic financial service provider registered with the Financial Services Commission of Korea.
Differentiator
Problem solved
Functional benefit
Brands
- 퍼핀 (Firfin): Family financial platform for children's allowance management featuring prepaid cards with transportation functionality, financial education content, and investment services for children aged 7+.
- 부자 패스 (Rich Pass)
Products and services
- Firfin Platform (퍼핀) A family financial platform for Korean parents and children aged 7+ that combines a prepaid debit and transit card with a mobile app for allowance management, parental spending controls, and gamified financial education.
- Firfin Card (퍼핀카드) A prepaid debit card for children that doubles as a nationwide Rail Plus transit card, accepted at all KB Kookmin Card merchants. Issued via the Firfin app without requiring a bank account or branch visit, with free issuance, usage, and allowance transfer fees.
- Firfin Investment Service (퍼핀 투자 서비스) A parent-supervised stock investment service for children, allowing research, investment journal writing, and buy/sell orders through a Shinhan Investment Securities CMA account, with simulated US stock investing.
- Firfin Plus Membership (퍼핀 플러스) A paid subscription membership offering unlimited access to exclusive financial education content, premium quiz maps, curated book giveaways, and member benefits such as discounts on overseas English camps.
- Rich Pass (부자 패스) An integrated family financial service supporting minor stock account opening, parent-managed proxy stock trading, gift tax planning, and Hometax self-reporting for Korean families managing children's investments and wealth transfer.
- Korea Financial Literacy Assessment (KFQA, 한국금융이해력평가) A financial literacy assessment program for elementary school students, developed in partnership with Maeil Business Newspaper and sponsored by the Council for Youth Financial Education.
Quantifiable outcome
- 200,000+ users within one year of launch
- +2 more outcomes
Companies that use Lemontree
Customer profileNamed customers2 records
Segments2 records
Ideal customer profiles1 record
Lemontree technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration3 records
Feature5 records
Lemontree partnerships and signals
Strategic signalPartnerships
Nine partnerships are on record, tiered core, minor and moderate.
- Shinhan Investment Securities (신한투자증권)coreStrategic MOU for children's investment education. Shinhan Investment Securities provides non-face-to-face securities account opening, financial education content, and stock investment services through the Firfin app. Children can open CMA accounts and learn investing with parent approval.
- Jangwon Education (장원교육)minorMOU to provide enhanced learning experiences combining Jangwon Education's professional character education with Firfin Plus membership. Joint '초등 시사 어휘력 강화 패키지' learning package offered to members.
- Korea Federation of Banks (은행연합회)moderateBank-led social responsibility project to provide financial education for children and teenagers. Developed metaverse-based financial education quiz map 'Bank랑 놀자' within Firfin World, where children solve finance quizzes and earn rewards.
- Emart24 (이마트24)minorStrategic MOU for joint marketing, co-developing collaborative products, and brand promotion using both companies' online and offline infrastructure. Emart24 targets future teen consumers through Firfin's young user base.
- Korea Railroad Corporation / Rail Plus (코레일/레일플러스)coreRail Plus transportation card function is embedded in the Firfin card. Children can use the card for public transit nationwide. Card charging and management is provided by Rail Plus.
- KB Kookmin Card (KB국민카드)corePayment processing partner for Firfin card transactions. All card payments at KB Kookmin Card merchant terminals are processed through this partnership. Also provides the virtual account system for deposits.
- Hana Bank (하나은행)moderateVirtual account provider for user deposits. Changed from KB Kookmin Bank to Hana Bank in March 2026 for deposit accounts. Prepaid funds are held in Hana Bank trust accounts.
- Hope Bridge National Disaster Relief Association (희망브리지 전국재해구호협회)minorCollaborated on disaster relief campaigns including the 2025 wildfire relief campaign where 843 families donated 6.8 million KRW using their Firfin allowance. Another flood relief campaign was conducted in summer 2025.
- MBC Union Camp (MBC 연합캠프)minorExclusive partnership offering Firfin members discounts on overseas English camps. Members receive 3% cashback (up to 200,000 KRW) on camp payments when registering through Firfin. Covers 14 camp programs across US, Canada, UK, Australia, New Zealand, Philippines, Singapore, and Jeju.
Scale indicators6 records
Recent moves6 records
Expansion highlights6 records
Lemontree competitors and assessment
Company assessmentDirect peers
- Greenlight Financial: US-based kids and teen debit card with parent controls and a robust financial education content layer. Closest global analog to Firfin's combined card-plus-education offering, serving a similar parent-child use case at materially larger scale.
- GoHenry: UK-originated prepaid card and financial education app for children aged 6–18 with parental controls and money-management learning. Directly comparable to Firfin in product design, age cohort, and core value proposition.
- Copper Banking: US teen-focused debit card and financial education platform. Comparable to Firfin's positioning as a first-card experience for minors combined with parent oversight and money lessons.
- Step: US teen banking and credit-building platform that combines a card account with financial education for under-18 users. Comparable to Firfin's card + education + investment-learning concept for a US teen audience.
Broad incumbents
- Toss: Korean super-app offering payments, banking, investing, and lifestyle services to tens of millions of Koreans. A domestic broad incumbent that could expand into minor-targeted financial services and compete with Lemontree's niche.
- Kakao Pay: Korean payments and financial services platform within the Kakao ecosystem. Most relevant domestic broad incumbent given Kakao Investment's existing stake in Lemontree — represents both distribution opportunity and competitive threat.
- Revolut (Under 18 / Revolut Junior): Global neobank that offers a Junior/Under-18 account with parent controls and allowance management within its broader adult super-app. Comparable feature set to Firfin's allowance + parent controls, though embedded inside a much larger incumbent platform.
Others
- Stash: US beginner-investing platform combining brokerage accounts with educational content. Comparable to Firfin's investment-education angle (including the $2,000 mock US stock portfolio feature), though targeted at adults.
- Acorns: US micro-investing app focused on beginner investors with educational content. Adjacent to Firfin's Firfin Investment feature, though Acorns serves adults and operates an investing-first rather than allowance-first model.
Regional players
- Mydoh: Royal Bank of Canada-owned smart money management and prepaid card app for Canadian kids and teens. Comparable to Firfin in parental controls, allowance management, and youth financial literacy positioning, but Canada-only.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks7 records
Key highlights7 records
Customer concentration
Lemontree social profiles
Digital presenceLemontree compliance and trust
Trust signalCompliance1 record
Lemontree financial estimates
Financial estimateRevenue estimate
Valuation estimate
Lemontree leadership team
Management profileNumber of profiles
Profiles1 record
Lemontree funding detail
Funding detailFunding overview
Funding rounds2 records
Investors9 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Lemontree M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Lemontree
What does Lemontree do?
Lemontree operates Firfin (퍼핀), a family financial platform providing prepaid debit and transit cards for children aged 7+, paired with a mobile app for allowance management and parental controls. The platform combines spending tools, real-time transaction monitoring, and 2,000+ gamified financial education quizzes, plus parent-supervised investment services through Shinhan Investment Securities.
Is Lemontree a public or private company?
Lemontree is a private company. It is classified as venture growth investor backed and is currently operating.
When was Lemontree founded?
Lemontree was founded in 2021. It employs 11 to 50 people.
Where is Lemontree based?
Lemontree is headquartered in Seongnam, South Korea, in the Asia region.
How does Lemontree make money?
Four revenue lines are on record. Plus Membership Subscription is the primary driver. The others are transaction Interchange, firfin Convenience Store (퍼핀머니샵) and referral Program.
Who are Lemontree's main competitors?
Direct peers on record are Greenlight Financial, GoHenry, Copper Banking and Step. Broad incumbents are Toss, Kakao Pay and Revolut (Under 18 / Revolut Junior). Others are Stash and Acorns. Mydoh is listed as a regional player.
Does Lemontree have an API?
No public API is recorded for Lemontree.
What industry is Lemontree in?
Lemontree's product category is Kids Fintech. Its primary akta.pro industry code is FSAGALAC, Embedded Card Issuing & Card-as-a-Service, with a secondary code of FSAMANAK, Prepaid Card Program Managers & Issuers (BIN Sponsors). Its NAICS code is 52221 and its SIC code is 6141.