LeetCode
3,000+
problem count
Yes, timed assessments
mock interviews
Yes (Premium only)
system design
20+ languages
languages
Yes, contests and discussions
peer practice
$159/year (Premium)
pricing
AlgoExpert
200+ curated
problem count
Yes, video-based walkthroughs
mock interviews
Yes (SystemsExpert add-on)
system design
9 languages
languages
No
peer practice
$99/year
pricing
HackerRank
7,500+ (hiring platform)
problem count
Yes, for candidates
mock interviews
No
system design
35+ languages
languages
Yes, community challenges
peer practice
Free for developers (employer plans from $100/month)
pricing
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