AMP GTM-compatible substitute of visitor-track?

[Avature.Marketing]

Hi! I'm just about to go live with a new version of the site of the company I work for, this site will be 100% built in AMP.

We used visitor-track from netfactor.com to track possible leads but I've found out is not one of the approved vendors by the AMP version of Google Tag Manager. Do you guys know about any substitutes for this tool apart from GA?