CASIL

What CASIL does

CASIL, operating under the legal name CommuniLink Internet Limited, is a Hong Kong-based provider of web-based office and email management services. Founded in 1998, the company operates the CLink Office v2 platform, which bundles WebMail v5.4 for browser-based email access and an Email Manager for administrative control of domains and user accounts. The platform is delivered as a self-service web application accessible via casil-group.com and weboffice.com.hk, with multi-language support in English, Simplified Chinese, and Traditional Chinese — indicating a focus on Hong Kong and Greater China markets.

The technology stack is a conventional web-based productivity suite: users access email and office tools through any browser without local software installation, and administrators manage domain-based email accounts through a simple web interface. The underlying technology appears dated — the Email Manager component's copyright dates from 1999-2009, suggesting minimal modernization over the past 15+ years. There is no indication of mobile applications, API access, third-party integrations, or AI/ML capabilities.

The business model is subscription-based recurring revenue from individuals and small businesses needing domain-based email hosting and lightweight web-based office tools. The go-to-market is entirely self-serve / product-led, with no sales team, no public pricing, no named enterprise customers, and no disclosed marketing channels beyond the company website. The company is supported by its parent, CommuniLink Internet Limited, which provides the underlying infrastructure. The overall profile is that of a small, long-running but minimally resourced niche utility serving a localized Hong Kong customer base.

Name

CASIL

Legal name

CommuniLink Internet Limited

Website

https://casil-group.com

Company type

Private

Founded year

1998

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

CASIL (CommuniLink Internet Limited) is a Hong Kong-based provider of CLink Office v2, a self-service web-based email and office management platform serving individuals and small businesses in Hong Kong and Greater China since 1998.

Ownership category

akta.pro rank

Headquarters

HQ city

Kowloon City

HQ country

Hong Kong SAR China

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Infrastructure, Operations, Personnel

Revenue model

1. Web-based Office/Email Services: The company provides web-based office and email management services. Based on the service offerings (WebMail, Email Manager, CLink Office), revenue is generated through subscription-based access to online office and email hosting services for businesses and individuals.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

CASIL provides the CLink Office v2 web-based office platform, which delivers browser-accessible email and office productivity services. The offering combines WebMail v5.4 for online email access and Email Manager for domain and account administration, enabling businesses and individuals to manage email accounts and office tools without local software installation.

Product overview

CASIL offers CLink Office v2 as a unified web-based office platform. The product suite includes the core CLink Office v2 platform for web-based office access, paired with WebMail v5.4 for email functionality and Email Manager for administrative email management. These components work together to provide a complete online office experience for business users.

Differentiator

Problem solved

Functional benefit

Brands

• CLink Office: Online office platform providing webmail and email management services

Products and services

• CLink Office v2 Web-based online office platform providing browser-accessible office tools and serving as the central hub for CLink Office services, including email access and email management functionality. Designed for businesses and individuals needing remote, browser-based office productivity.
• WebMail v5.4

Segments1 record

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• CommuniLink Internet LimitedcoreOthersCommuniLink Internet Limited is the parent company and service provider behind the CASIL CLink Office platform. The company holds the copyright (1998-2026) for all CLink Office services including WebMail v5.4 and Email Manager. The services are hosted on CommuniLink's infrastructure and branded under the CASIL domain.

Scale indicators1 record

Recent moves3 records

Expansion highlights3 records

Market position

Competitive moat3 records

Key risks5 records

Key highlights4 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about CASIL