Yes, both GreyMetrics and Power My Analytics offer a Free Trial.
GreyMetrics is designed for Large Enterprises, Medium Business and Small Business.
Power My Analytics is designed for and undefined.
Pricing for GreyMetrics Starts at $49 whereas for Power My Analytics Starts at $24.96/Month when Billed Yearly.
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 Power My Analytics includes Porter Metrics, Funnel, Megalytic, ETLrobot, Admetrics Data Studio, Analytics Canvas, Albato, Supermetrics and Halo.