[akavi]

50 $/mo for 20 interviews seems pretty cheap to me?

Estimating an engineering employee costs 100 $/hr, then 2.5 $/interview is way less than you're spending on the person conducting the interview. And 600 $/year is a steal unless you think it'll only take 6 hours to implement your own version + yearly maintenance.

[akanet]

I'm the guy that runs CoderPad, and I agree with your assessment. We believe our entry level pricing to be actually rather cheap, and our customers generally agree.