Yes, both Popwork and 15Five offer a Free Trial.
Popwork is designed for Medium Business and Small Business.
15Five is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of 15Five begins at $7/User/Month, while pricing details for Popwork are unavailable.
Some top alternatives to Popwork includes Lattice, 15Five, Synergita, Kallidus Perform, Steer, 10xPerformance, Teamflect, Performly, Appreiz, Leapsome, Teamsy and ReviewSnap.
Some top alternatives to 15Five includes Lattice, Impraise, Synergita, Betterworks, Performance Culture, PerformanceHub, 10xPerformance, Culture Amp, Performly, Employee Success Platform, Leapsome and EmpowerPoints.