MatterMark is described as 'Mattermark lets you search for companies & investors to effortlessly create actionable lists for leads. Enrich your company data with customer intelligence from the industry leader of identity resolution' and is an website. There are more than 10 alternatives to MatterMark, not only websites but also apps for a variety of platforms, including SaaS, Salesforce, Gmail and HubSpot apps. The best MatterMark alternative is ZoomInfo. It's not free, so if you're looking for a free alternative, you could try CrunchBase or Marcom Robot Data Enrichment Engine. Other great sites and apps similar to MatterMark are PitchBook, CB insights, Clearbit Connect and Raizer.