Yes, both GreyMetrics and Windsor.ai offer a Free Trial.
GreyMetrics is designed for Large Enterprises, Medium Business and Small Business.
Windsor.ai is designed for Large Enterprises, Medium Business and Small Business.
Pricing for GreyMetrics Starts at $49 whereas for Windsor.ai Starts at $99/Month.
Some top alternatives to GreyMetrics includes LiveReport.io, AgencyAnalytics, Reportz, JustControl.it, Vidooly, iDashboards, DashThis, Power My Analytics, Megalytic and SharpDash.
Some top alternatives to Windsor.ai includes Searchmetrics, rampmetrics, Dreamdata, Attributer, Adjust, Metric Magnet, Admetrics Data Studio, Adobe Analytics, Metricscreen and Supermetrics.