Why I have a lot more visitors on Zoho Sales IQ than on Google Analytics

Why I have a lot more visitors on Zoho Sales IQ than on Google Analytics

Hi ,


I was surprised when I saw 21 visitors on my site in Zoho Sales IQ.
At the same time I was monitoring my site on Google Analytics realtime.
There the figures showed 3 online visitors. How is this possible?
I excluded some IP addresses in google analytics but this can not explain the difference. 
Could this have to do with robots?

Our website is www.crowdbeamer.com

Kind regards,
Heleen