Join us from July 23rd - 26th 2018 at ClueCon to learn more about Optimize! Check out the schedule here.

About Us

CALLSTATS I/O Oy is a Software as a Service company based out of Helsinki. It provides products that measure and manage the performance of real-time media communication. The product helps software developers set up, build, and scale communication applications quickly. Founded in 2014 and originally known as Nemu Dialogue Systems, was named a Cool Vendor in Unified Communications in 2016 by research firm Gartner. The product integrates with various third party SDKs and PaaS solutions which make it easier to build and deploy WebRTC applications.

Read more about the WebRTC measurement architecture and the libraries for: callstats.js (Javascript), (Java).


The company is also listed on  Angel List, CrunchBase, and LinkedIn.

We are backed by the best:
  • Petteri Koponen of Lifeline Ventures is a serial entrepreneur, founded 5 companies including Jaiku (sold to Google) and is on the board of several companies.
  • Om Malik of True Ventures is an entrepreneur and a world-renouned technology journalist. He is on the board of serveral companies including, TwinPrime, Veniam. According to him these companies represent opportunities in ever changing network architectures.

  • Contribution to Standards and Research

    We are active contributors to WebRTC-related standards, both at the IETF and W3C. A complete list of our IETF contributions are available at [1, 2]. We've also carried out extensive research related to multimedia delivery. Details are available from Google Scholar [3, 4].

    Automating Diagnostics and Optimizations

    Our Colors


    Social Wall


    WebRTC AI solution wants to Optimize your calling experience [App Developer Magazine]

    WebRTC Standards Updates Post-TPAC 2017 [AllThingsRTC]

    Interview with Dr. Varun Singh, Founder and CEO of [AllThingsRTC]


    Cool Vendors in Unified Communications, 2016 [Gartner]

    The Big Churn – learning from real usage stats [webrtchacks]

    WebRTC Post-Mortem: Looking at the Good & the Bad [nojitter]

    Listed in Slack's App Directory [SlackHQ] using Temasys Plugin to extend functionality [Temasys] Brings WebRTC Monitoring to Jitsi Meet [WebRTC World]

    #W3Cmember joined W3C [Tweet]

    Particpants in the WebRTC Group [webpage]

    WebRTC Meetup Japan [youtube]

    Multimedia as a Service [SIGCOMM15]

    VUC552: Live with Varun Singh @callstatsio [VUC]

    2015 NGSP Interview [Mollie Lloyd, IIR Telecoms]

    10 Inspiring WebRTC Interviews [ (email needed)]

    WebRTC Barcelona Mobile World Congress [youtube]

    WebRTC/ORTC Update, see slide 78 (Japanese) [slideshare]

    Promise discussion incandescent! TPAC 2014 WebRTC Working Group Report (Japanese) []

    WebRTC: A front-end perspective, see slide 61 [slideshare]

    Mapping the WebRTC ecosystem [WebRTC Index]

    Great Quality At Inventure Seed Day [Inventure]

    The WebRTC Landscape Infographic in June 2014 [cio2cmo]

    The 4 Different Approaches of Using WebRTC APIs []

    'The train has already left the station.' There are already 250 solution providers. (Hebrew) [] and WebRTC: An Interview With Varun Singh []

    Paris Webrtc Conference Impressions []

    Monitoring and Alerting Session at WebRTC Expo [PPT]

    Get your WebRTC implementation right [hackspk]

    Varun Singh to Present at WebRTC Conference and Expo III [WebRTC World]

    Performance Monitoring of Media Flows in WebRTC [RTC-Conf]