Yes, both KillerCoder.io and Codidate offer a Free Trial.
KillerCoder.io is designed for Large Enterprises, Medium Business and Small Business.
Codidate is designed for Individuals, Freelancers, Medium Business and Small Business.
The starting price of Codidate begins at $49/Month, while pricing details for KillerCoder.io are unavailable.
Some top alternatives to KillerCoder.io includes DevScreen, Qualified, Workvivo, UnbugQA, CoderPad, DevSkiller, Toggl Hire, HackerRank, IFTTT, Online Check Writer and Drag.
Some top alternatives to Codidate includes LeetCode Interview, CodingView.io, Qualified, Workvivo, ViewCoder, HackerPen, CoderPad, Interview Sandbox, HackerRank, KillerCoder.io and IFTTT.