TL;DR: If you are learning data structures for the first time, free resources are genuinely good enough, and Abdul Bari plus a university course will teach you the theory. If you are preparing for interviews with a deadline, a structured pattern-based course saves the most time, because the bottleneck is recognition rather than knowledge. Pick based on which of those two problems you have.
First, the disclosure. I created Grokking the Coding Interview, and Design Gurus is my company. One of the options below is mine. Read this the way you would read any comparison written by someone with a product in it. Every price and feature here is public, so you can check each one yourself.
The reason to write it anyway is that most "best DSA course" lists compare things that are not comparable. A university algorithms course and an interview prep platform are different products solving different problems.
This article splits them by the problem they solve, gives real prices, and says who each one suits.
First, decide which problem you have
There are two, and they need different resources.
Problem one: you do not know the material. You cannot explain what a hash map costs, or how a breadth first search works. You need teaching. Free resources are excellent here, and paying does not help much.
Problem two: you know the material but freeze on new questions. You understand heaps, and you still cannot see that a question is a heap question. This is a recognition problem, and it is the one that fails interviews. Structured pattern-based practice is what fixes it.
Most people preparing for interviews have problem two and buy for problem one. That is the mistake worth avoiding.
The comparison
| Option | Type | Cost | Best for |
|---|---|---|---|
| Abdul Bari (YouTube) | Free video | Free | Learning the theory properly |
| freeCodeCamp (YouTube) | Free video | Free | Long form single-sitting coverage |
| William Fiset (YouTube) | Free video | Free | Graphs and data structure internals |
| MIT OpenCourseWare 6.006 | Free university course | Free | Rigorous foundations |
| Princeton Algorithms (Coursera) | University course | Free to audit | Theory with proofs |
| Tech Interview Handbook | Free written guide | Free | A free interview roadmap |
| NeetCode | Curated list plus videos | Free tier, Pro about $119 a year | A free problem roadmap |
| AlgoExpert | Video platform | About $199 a year | Video walkthroughs |
| Educative | Subscription platform | About $59 a month | Text-based courses in a browser |
| Boot.dev | Interactive platform | About $59 a month | Learning by building |
| Grokking the Coding Interview | Pattern course | $79 once, lifetime | Pattern recognition for interviews |
Prices move. Check the current number before you buy.
The free options, and how far they get you
Free resources for data structures are strong. Anyone claiming you must pay to learn the theory is selling something.
Abdul Bari is the most recommended teacher for fundamentals. The explanations focus on why an algorithm works rather than on memorizing it, and the coverage of trees, graphs, and dynamic programming is thorough. Start here if the theory is shaky.
freeCodeCamp publishes multi-hour courses that cover a whole syllabus in one video. Useful if you prefer continuous teaching over short clips.
William Fiset has the clearest free material on graph theory and on how data structures work internally.
MIT OpenCourseWare and Princeton's Algorithms on Coursera are real university courses, free to watch. They go deeper into proofs and analysis than an interview needs, which is useful if you want to understand rather than pass.
NeetCode has a free roadmap of curated problems plus video solutions for most of them. It is the best free interview-focused starting point, and we walk through it in detail in our NeetCode roadmap guide.
Tech Interview Handbook is a free written guide covering the whole process, not just algorithms.
How far does free get you? Most of the way, if you are disciplined. What free resources do not give you is sequencing and grouping. You get a pile of good explanations and a list of problems, and you have to build the study plan yourself.
The paid options, and what you are paying for
Paid platforms are not selling information. They are selling structure, sequencing, and time saved.
NeetCode Pro adds paid features on top of the free roadmap. It runs at about $119 a year or roughly $297 for lifetime access. Good value if the free roadmap already suits you.
AlgoExpert sells video walkthroughs of a curated problem set at about $199 a year, with no lifetime option. The video production is strong. You are paying for someone explaining each problem well.
Educative sells a subscription to a large library of text-based, in-browser courses at roughly $59 a month. Broad, and access ends when you stop paying.
Boot.dev teaches through interactive projects at about $59 a month. It suits people who learn by building rather than by watching.
Grokking the Coding Interview is ours. It costs $79 once, with lifetime access. It teaches 41 patterns: 30 common and 11 advanced. Each one comes as a tell, a template, and a set of variations, with more than 300 problems grouped so recognition builds. Solutions come in Python, Java, JavaScript, C++, C#, and Go.
The honest comparison: if you want someone to explain individual problems well, AlgoExpert and NeetCode do that. If your issue is that you solve a problem, understand the solution, and still cannot see the next one, a pattern course targets that directly. That is the gap it was built for, and it is why the format exists.
For a direct head to head against the closest alternatives, see Grokking vs NeetCode and Design Gurus vs Educative.
What to pick, by situation
You are a student with a year or more. Free, all of it. Abdul Bari or a university course for theory, then NeetCode's free roadmap for practice. Add a pattern course only in your final few months.
You have three to six months and a target company. Free theory if you need it, then a pattern-based course for the practice phase. Spending money on video walkthroughs of individual problems is the least efficient choice at this stage.
You have four to eight weeks. Skip the theory courses entirely. You do not have time to relearn material you half know. Go straight to pattern practice with a curated list, and add timed mock rounds.
You have two weeks. No course will help much. Use a curated short list, review the core patterns, and spend most of your time on mock rounds out loud. Our four week study plan compresses reasonably to two if you cut the advanced patterns.
You keep failing interviews despite solving hundreds of problems. This is a recognition problem, not a knowledge one. More problems will not fix it. Reorganize your practice by pattern and add explaining out loud.
Grokking the Coding Interview is built for that last case specifically.
What no course gives you
Every option above teaches content. None of them can practice the interview for you.
The round is a live performance. You talk while you think, you handle interruptions, you take a hint without losing your place, and you write code someone reads as it appears. Watching videos does not train any of that.
So whichever option you pick, add two things: solve problems out loud with a timer, and do real mock interviews with a person. Candidates who skip this reliably underperform their practice results.
Frequently asked questions
What is the best DSA course for beginners? For learning the theory, free resources are as good as paid ones. Abdul Bari on YouTube and MIT OpenCourseWare 6.006 both teach the fundamentals thoroughly, and neither costs anything.
What is the best YouTube channel for DSA? Abdul Bari for fundamentals and intuition, William Fiset for graphs and data structure internals, freeCodeCamp for long single-sitting coverage, and NeetCode for interview-focused problem walkthroughs. Most people benefit from one concept channel plus one problem channel.
Are free DSA courses good enough for interviews? For the material, yes. What free resources lack is sequencing, which means you build the study plan yourself. If you have plenty of time that is fine, and if you have a deadline it is the expensive part.
Is NeetCode or AlgoExpert better? NeetCode has a strong free tier and costs less, with a lifetime option. AlgoExpert has higher production quality video walkthroughs and costs about $199 a year with no lifetime option. If you are choosing on value, NeetCode is the better deal for most people.
Should I pay for a DSA course at all? Only if it solves a problem free resources do not. If you cannot explain a hash map, use free material. If you understand the material but freeze on unfamiliar questions, a structured pattern-based course targets that directly and saves real time.
How long does a DSA course take? A theory course runs 20 to 40 hours of video. An interview-focused pattern course takes most people 6 to 10 weeks alongside a job, since the time goes into solving problems rather than watching. The watching is the small part.
Related reading
- The DSA Patterns Cheat Sheet: All 41 on One Page
- The NeetCode Roadmap, Walked Through
- Grokking the Coding Interview vs NeetCode
- How Many LeetCode Problems Do You Actually Need?
- LeetCode vs Codeforces vs CodeChef vs HackerRank
If your problem is recognition, not knowledge: Grokking the Coding Interview: Patterns for Coding Questions teaches all 41 patterns as a tell, a template, and a set of variations, with more than 300 hand-picked problems in six languages. It costs $79 once, with lifetime access.