Expert in communications software

Celtius is a specialist in communications software and mobile applications. We provide communications protocol software and expertise for network vendors, mobile handset suppliers, operators and other enterprises.

Customer applications

Our products enable our customers to build software applications complying with standard protocol interfaces. Some examples are customer built testing and monitoring solutions, communication proxies and gateways for mobile operators, as well as embedded software for mobile handsets.

One of the key areas of our expertise is the ASN.1 language and related tools. ASN.1 is a widely used formal notation for specifying protocols for e.g. 3G and 4G networks.


We invest in other enterprises with special interest in ICT related start-ups.

Celtius Oy

Erottajankatu 11 B 8