int21
int21 is a small, privately held Tokyo-based IT services firm providing system development consulting, custom software, internet/intranet construction, and managed WWW + RDBMS hosting built around its proprietary WebLang System, primarily serving Japanese enterprise clients on legacy Windows NT/UNIX stacks.
- Company typePrivate
- Founded1997
- HeadquartersSetagaya, Japan
- Headcount1–10
- GTM typeB2B
- OfferingServices
What int21 does
int21 is a Tokyo-based, privately held Japanese IT services firm established in 1997 (with website activity dating to 1996), operating from Setagaya-ku with 1–10 employees and a stated capital of 30 million yen. The company provides a portfolio of legacy-era professional services spanning system development consulting, custom software development for Windows NT/UNIX environments, internet/intranet system construction, internet provider services (via wholly-owned subsidiary int21 Network Service), managed WWW + RDBMS rental server hosting, software developer training, and technical writing. Its primary proprietary asset is the WebLang System — a Perl/C++-based integrated platform that bridges WWW front-ends with Oracle OCI, SQL Server via DAO/ODBC, and UNIX/BSD/Linux back-ends, supporting user registration, mailing lists, BBS access control, and Radius-based authentication.
The business model is primarily project-based professional services sold direct to Japanese enterprise clients, with hourly consulting rates ranging from 150,000 JPY to 800,000 JPY and project builds starting at 50,000 JPY, supplemented by a modest recurring revenue stream from rental server and internet provider services. The firm maintains horizontal enterprise segmentation with no disclosed named customers, though its past work includes the PC Developer Network (PCDN), Avex network alert systems, NTT-ME-compatible systems, and several game/media industry clients. Pricing is quote-based and not publicly disclosed, and revenue figures are not reported.
int21 has remained a small, stable niche operator for nearly three decades, with a minor technology partnership with NTT-ME and no disclosed M&A, funding, leadership changes, or expansion into modern cloud, SaaS, or AI domains. The technology stack is anchored in 1990s/2000s-era tools (Visual Basic 6.0, Perl, C++, Windows NT, Oracle7/8), and the firm operates exclusively in the Tokyo Metropolitan Area with no global footprint claim.
int21 firmographics
Firmographics- Name
- int21
- Legal name
- int21 Corporation
- Website
- https://int21.co.jp
- Company type
- Private
- Founded year
- 1997
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- int21 is a small, privately held Tokyo-based IT services firm providing system development consulting, custom software, internet/intranet construction, and managed WWW + RDBMS hosting built around its proprietary WebLang System, primarily serving Japanese enterprise clients on legacy Windows NT/UNIX stacks.
- Ownership category
- akta.pro rank
int21 industry classification
Industry- Product category
- Custom Software Development and IT Consulting Services
- NAICS
- Custom Computer Programming Services (541511), Computer Systems Design Services (541512), Computer Systems Design and Related Services (54151), Other Computer Related Services (541519)
- SIC
- Services-Computer Programming Services (7371), Services-Computer Programming, Data Processing, Etc. (7370), Services-Computer Integrated Systems Design (7373)
- akta.pro primary industry
- Enterprise Architecture & IT Operating Model (BPAHAEAB)
- akta.pro secondary industry
- Platform Engineering & Internal Developer Platforms (IDP) (BPAEAKAC)
Keywords
Where int21 is headquartered
LocationHeadquarters
- HQ city
- Setagaya
- HQ country
- Japan
- HQ region
- Asia
Offices2 records
Markets served
int21 business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Technology or R&D, Operations, Infrastructure, Marketing or Sales
Revenue model
- System Development Consulting: Professional consulting services for system development projects, providing technical guidance and architecture planning.
- Software Development: Custom software application development for Windows NT, UNIX, and client/server environments using Visual C++, Visual Basic, and Oracle technologies.
- Internet/Intranet System Construction: Design and implementation of internet and intranet solutions including web servers, RDBMS integration, and network infrastructure.
- WWW RDBMS Rental Server: Hosted rental server services providing web hosting with RDBMS capabilities for business customers.
- Technical Writing: Documentation and technical writing services for software systems and applications.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Pay-as-you-go | Consulting services priced from 150,000 JPY per hour |
| Other | Pay-as-you-go | Detailed technical consulting from 800,000 JPY per hour |
| Other | Pay-as-you-go | Outsourced dispatch services from 200,000 JPY per hour |
| Other | Multi-year contract | WWW + RDBMS system construction from 500,000 JPY |
| Other | Multi-year contract | Outsourced WWW + RDBMS construction from 50,000 JPY |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels1 record
int21 product offering
Product offeringCore offering
int21 Corporation provides custom software development, system development consulting, internet/intranet system construction, internet provider services, WWW RDBMS rental server hosting, software developer education, and technical writing for enterprise clients in Japan. Its flagship proprietary product is the WebLang System, an integrated WWW and RDBMS application platform that connects web servers with relational databases such as Oracle and SQL Server. The company serves as a one-stop provider from requirements definition and architecture planning through implementation, deployment, and ongoing hosting.
Product overview
int21 is a software development and IT services company offering a portfolio of products and services centered around web-based systems and database integration. Their primary proprietary product is the WebLang System, a WWW RDBMS application system that combines web server and database functionality. Supporting services include system development consulting, software developer education, internet/intranet construction, and technical writing. The company also provides rental server services combining WWW and RDBMS capabilities, along with custom application development for Windows NT and UNIX platforms.
Differentiator
Problem solved
Functional benefit
Brands
- WebLang System: WWW RDBMS integrated server system developed by int21 for web application development.
Products and services
- WebLang System
Companies that use int21
Customer profileSegments1 record
Ideal customer profiles1 record
int21 technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration5 records
Feature2 records
int21 partnerships and signals
Strategic signalScale indicators1 record
Recent moves5 records
int21 competitors and assessment
Company assessmentDirect peers
- SRA Holdings: Mid-sized Japanese IT services and independent software vendor serving enterprise and academic clients. Closely comparable to int21's niche mix of consulting, custom development, and proprietary software products.
- Hummingbirds (Japan): Boutique Japanese IT services firm offering system development, consulting, and content/education services. Closest small-firm analog to int21 in scale and service breadth.
- TechMatrix Corporation: Japanese IT services and software firm focused on database-driven enterprise web applications and integration — directly comparable to int21's WWW + RDBMS construction niche.
Broad incumbents
- BIPROGY (formerly UNISYS Japan): Established Japanese systems integrator delivering custom application development, system integration, and consulting — closely aligned with int21's full-lifecycle system development and consulting services.
- NTT DATA Group: Japan's largest system integrator providing consulting, system development, and managed services. The broad-incumbent counterpart to int21's niche system development and consulting work.
- Itochu Techno-Solutions (CTC): Major Japanese SI providing system construction, outsourcing, and managed services. Comparable in customer base (Japanese enterprises) and full-lifecycle systems work.
- Internet Initiative Japan (IIJ): Japan's largest independent internet/network services and managed hosting provider. Shares int21's internet/intranet construction and hosting focus but at vastly greater scale and with broader managed-services offerings.
- Otsuka Corporation: Japanese IT services and system integrator with strong presence in SMEs and education — comparable to int21's focus on business customers needing custom system construction and support.
- NS Solutions Corporation: Japanese SI focused on enterprise applications, system integration, and consulting. Comparable to int21 in delivering enterprise software build and consulting engagements.
Regional players
- Ufuru (U-Trust) Network Solutions: Tokyo-focused IT services and internet/intranet construction vendor with hosted services. Overlaps directly with int21's Tokyo metro-only internet system construction and rental server business.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat3 records
Key risks5 records
Key highlights6 records
Customer concentration
int21 financial estimates
Financial estimateRevenue estimate
Valuation estimate
int21 leadership team
Management profileNumber of profiles
int21 subsidiaries and ownership
Company hierarchySubsidiaries1 record
int21 funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
int21 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 int21
What does int21 do?
int21 Corporation provides custom software development, system development consulting, internet/intranet system construction, internet provider services, WWW RDBMS rental server hosting, software developer education, and technical writing for enterprise clients in Japan. Its flagship proprietary product is the WebLang System, an integrated WWW and RDBMS application platform that connects web servers with relational databases such as Oracle and SQL Server. The company serves as a one-stop provider from requirements definition and architecture planning through implementation, deployment, and ongoing hosting.
Is int21 a public or private company?
int21 is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was int21 founded?
int21 was founded in 1997. It employs 1 to 10 people.
Where is int21 based?
int21 is headquartered in Setagaya, Japan, in the Asia region.
How does int21 make money?
Five revenue lines are on record. System Development Consulting is the primary driver. The others are software Development, internet/Intranet System Construction, WWW RDBMS Rental Server and technical Writing.
Who are int21's main competitors?
Direct peers on record are SRA Holdings, Hummingbirds (Japan) and TechMatrix Corporation. Broad incumbents are BIPROGY (formerly UNISYS Japan), NTT DATA Group, Itochu Techno-Solutions (CTC), Internet Initiative Japan (IIJ), Otsuka Corporation and NS Solutions Corporation. Ufuru (U-Trust) Network Solutions is listed as a regional player.
Does int21 have an API?
No public API is recorded for int21.
What industry is int21 in?
int21's product category is Custom Software Development and IT Consulting Services. Its primary akta.pro industry code is BPAHAEAB, Enterprise Architecture & IT Operating Model, with a secondary code of BPAEAKAC, Platform Engineering & Internal Developer Platforms (IDP). Its NAICS code is 541511 and its SIC code is 7371.