Yes, both CoderPad and HackerRank offer a Free Trial.
CoderPad is designed for Large Enterprises, Medium Business and Small Business.
HackerRank is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for CoderPad Starts at $1,500/Month whereas for HackerRank Starts at $249/Month when Billed Yearly.
Some top alternatives to CoderPad includes LeetCode Interview, CodingView.io, Codility, Codejudge, HackerEarth, SkillRobo, HackerRank, KillerCoder.io, Codidate and CodeSignal.
Some top alternatives to HackerRank includes DevScreen, LeetCode Interview, Qualified, Workvivo, HackerPen, Codejudge, CoderPad, HackerEarth, Interview Sandbox, KillerCoder.io, IFTTT and Codidate.