Unlocking Profitable Growth

At Cosmostack, built on impact, innovation, and support — empowering teams to thrive, make a difference, and drive what matters.

"CosmoStack is an innovative global technology Service, serving users across over 20 markets."

Core Offerings

Best-in-class
solutions for growth

We drive performance by prioritizing reliability. Our solutions enable businesses and partners to achieve significant returns at a lower cost, leading to positive outcomes. Discover how we can help guide you toward success online.

Managed Solutions

your business's day to day technology management and infrastructure support to a third party Managed Service Provider

Integration

A large number of clients have placed their trust in us, thanks to our secure and sustainable integrations.

Transformation

Integration of digital technology into all areas of an organization adapts to market shifts. Save Operational Cost & Time.

100+ Customers | 1M Users | 39 & COSMO

Loved by customers worldwide

    
 
 
      Trustindex verifies that the original source of the review is Google. Very   Satisfied with the quality of  the work done.I will continue to work with Three Nine Because They Do Amazing and Wonderful Job. Very Professional,Friendly and Efficently Working  Staff  and Prices are Reasonable. Highly recommend For Everyone Who Need
  
  Posted on Google  
 
    
   Isuru Senavirathna 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. Wonderful experience working with the 39web design company sri lanka and the  team.It has never been a difficult task to communicate like other companies. Always worked hand in hand throughout the development of website and even after that. Thank You  for taking care of all our requirements for the website.
  
  Posted on Google  
 
    
   Kids & Jnior Mall 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. '39 created an attractive, international-standard website for our Cisco Academy within a very short time. Their hosting service is extremely fast.
  
  Posted on Google  
 
    
   Indrajith Bandara 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. Highly impressed with the service provided by Three Nine! They are extremely professional, responsive, and clear in their communication throughout the entire project. The team truly understands modern web design, delivery timelines, and IT solutions tailored to business needs. Highly recommended for anyone looking for Chamathkara reliable web design services in Sri Lanka.!
  
  Posted on Google  
 
    
   SATH 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. Excellent customer service and very responsive.Creative and managing, hosting is at its best. Certainly would recommend and had done so. We are totally satisfied. They manage our website at its best.
  
  Posted on Google  
 
    
   Mohammed Rimash 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. Madusanka and his team did a fantastic Job with our web site. What really impressed me was their communication with us. They were always there to answer questions, provide updates, listen to our feedback and always work with us to make our website, exactly the way we wanted it to be, which made the whole process smooth and stress-free.

Overall, his combination of creativity, expertise, flexibility and excellent communication made him a standout choice for our project.
  
  Posted on Google  
 
    
   Beauty OF Nature 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. three nine redesigned our website from scratch and exceeded our expectations. The design is modern, fast, and visually appealing, helping us stand out online. If you’re looking for the best web design in kegalle, 39 is the team to trust. Extremely professional service and great support throughout the project.
  
  Posted on Google  
 
    
   Avishka Pathum 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. Absolutely superior service! Hands down the best Light Design and hosting experience I’ve ever had. Professional, reliable, and truly committed to delivering an exceptional experience from start to finish. I highly recommend them to anyone looking for flawless performance!
  
  Posted on Google  
 
    
   Rahmath Shahan 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. Fast and reliable service. Reasonable prices.👍👍
  
  Posted on Google  
 
    
   Supun Liyanage 
 
 
 
 
  
  
 
 
     Verified by Trustindex  Trustindex verified that these reviews were published on Three Nine | Web Designer & IT Solutions in Sri Lanka's Google Business Profile. Learn more