Comparison
Best Free DSA Practice Platforms 2026
There's no single best free DSA platform — the right one depends on what you need. LeetCode has the largest problem bank and best community/discussion for general practice. NeetCode is best for a curated, pattern-based learning path. CSES is best for tight competitive-programming fundamentals. GeeksforGeeks is best for free written theory alongside practice. Ediky is best specifically if you want practice that mirrors a target company's real OA format, or want DSA, CS fundamentals, SQL, and aptitude in one free product.
LeetCode
The largest and most recognized DSA practice platform, with a huge problem bank and active discussion community.
- + By far the largest problem bank of any platform on this list
- + Deep discussion threads and community solutions on almost every problem
- + Contests and a rating ladder for competitive practice
- + The platform recruiters and interviewers recognize by name
- − Many high-value features (company-tagged problem lists, some editorial solutions) are behind LeetCode Premium
- − No CS-fundamentals, SQL, or aptitude content — DSA only
- − No company-specific timed OA simulation matching real assessment structure
GeeksforGeeks
A huge free library of written DSA and CS theory articles paired with practice problems.
- + Enormous free tutorial/article library, often the first search result for a given CS topic
- + Practice problems tied directly to explanatory articles
- + Completely free
- − Article quality and editing are inconsistent (large, crowd-contributed archive built over many years)
- − Ad-heavy reading experience
- − No timed, company-format OA simulation
NeetCode
Curated problem lists (NeetCode 150/250) organized by pattern, with free video explanations.
- + Strong, opinionated curation — tells you exactly what to solve and in what order
- + Free video walkthroughs for every problem in the curated lists
- + Clear pattern-based organization, good for a first structured pass through DSA
- − Built on top of LeetCode's problem bank rather than a fully independent judge/content set
- − No CS-fundamentals, SQL, or aptitude content
- − No company-specific OA simulation
CSES Problem Set
A free, tightly curated ~300-problem set widely used and respected in the competitive programming community.
- + Extremely well-curated problem selection with genuine algorithmic range
- + Clean, distraction-free interface
- + Completely free, no account friction
- − No built-in discussions or editorials — you'll need outside resources for solutions
- − Not aimed at placement/interview prep specifically — general competitive-programming training
- − No company tagging or OA-format practice
AlgoMonster
A pattern-based teaching platform organized around reusable problem-solving templates.
- + Explicit pattern/template teaching approach, useful if you learn better from structure than volume
- + Structured learning path with video explanations
- − Most of the content is behind a paid tier — the free tier is limited
- − No CS-fundamentals, SQL, or aptitude content
- − No company-specific OA simulation
HackerRank
A broad practice and skills-certification platform that many companies also use to actually run OAs.
- + Practicing here means practicing the same interface some real company OAs run on
- + Free skill certifications across many domains, not just DSA
- + Broad free question library
- − Editorial content and community discussion are thinner than LeetCode's
- − UI is often described as dated compared to newer platforms
- − No company-specific mock test presets matching a target company's real format weighting
Ediky
This is EdikyFree interview prep combining company-formatted OA mock tests, DSA practice, CS fundamentals, SQL, and aptitude in one product.
- + Company-formatted OA mock tests (Amazon, Google, Microsoft, Cisco, Uber) matching real question count, timing, and topic weighting — not just a generic problem list
- + CS Fundamentals bank (351 questions) with AI-evaluated scenario/debugging questions, not just flashcard MCQs — DBMS, OS, CN, OOP, and System Design
- + SQL practice (24 questions) and aptitude practice (236 questions, 18 topics) in the same product, not a separate tool
- + Completely free — no premium tier gating core features
- + Native desktop app for Windows, macOS, and Linux
- − Far smaller DSA problem bank (70 code-judged problems) than established platforms with years of community-contributed content
- − No discussion forums or community solutions per problem — you're practicing solo
- − Newer, much smaller brand — recruiters and interviewers won't recognize "I practiced on Ediky" the way they recognize LeetCode
- − Some DSA patterns (Sliding Window, Two Pointers, Backtracking, Heaps, Linked List) have thin or no dedicated topic coverage in the code-judged bank yet — see Ediky's own pattern guides for the honest breakdown
- − The 600-problem competitive-programming sheet isn't browsable as a list on the website anymore (retired in favor of the desktop app)
How to actually choose
If you're early and building fundamentals, GeeksforGeeks or NeetCode's structured lists are a reasonable starting point. Once fundamentals are solid, LeetCode's volume and community are hard to beat for general DSA reps. If your immediate goal is a specific upcoming OA at a specific company, Ediky's company-formatted mock tests are built for exactly that — nothing else on this list simulates a specific company's real timing and topic weighting.
Try Ediky's company-formatted OA mock tests
Free, matched to real company timing and topic weighting — see the DSA Roadmap for where to start.
Open the DSA Roadmap