Website Design & Development

All round performance, delivered with the right mix of creativity and technology.


Strategy & Marketing

Unify all the digital marketing efforts.
Focus them on the prime goal.


Application Development

Bespoke development of mission critical applications to server your unique business needs.


Managed Services

Relax, we take care of all the efforts needed to manage your web properties!
Content, Design, Development, Platform, Infrastructure...


We are ready when you are ready.

The table is set, contact us to explore how we can be partners for success.


Welcome to OpenSUM!
Premium Website Design & Development, Ecommerce @ Affordable Prices.


Perfect job by OpenSUM, the best!!!! Simply the best, they always answered nicely and if i didn't like something they changed it without problems!! They did an awesome job and of course will be working with them again. You will be the most satisfied customer if you choose to work with them.

Jose Mijares, Ciudad de México, DF, Mexico

Extremely pleasant to work with OpenSUM. The job was handled professionally, quickly and within budget. Will work with them again.

Patrick, Nottingham, United Kingdom

OpenSUM were nothing but courteous, polite and extremely professional throughout my whole encounter with them. Definitely recommend them to anybody looking to have a website made. 10/10!

Gavin, United States

The team at OpenSUM is extremely professional and will guide you if you need help. Communication via SKYPE made things easier with them. Hit a few bumps across the road but they were able to resolve them.

Gustavo, United States

OpenSUM is very professional. They are responsive to requests and milestone review feedback. Their work is excellent and of good quality. Very nice to have worked with you. Hope to work with you again in the near future.

Sam, Calgary, Alberta, Canada

Project Manager is a great communicator & has a very strong technical understanding. Grabbed the scope of work very quickly & the team exceeded our expectations. Highly recommended !!

E Vir, Chanhassen, Minnesota, United States

Very good work, everything was delivered on time. Any problems were discussed and solved immediately. Good work !

Milos, Sered, Slovakia, Slovak Republic

Excellent work!! Highly recommended!!

Martine, United States

By far the best development team I have ever used. The project was delivered well before the agreed timeline and everything is working. I will definitely work with them again.

Thierry Bourret, United Kingdom

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