The full review
What is LeetCode?
LeetCode is an online programming practice platform built around a large catalogue of coding questions, which the vendor calls the best platform to help you enhance your skills, expand your knowledge and prepare for technical interviews. The homepage headline is "A New Way to Learn," and the site pitches itself at people preparing for technical interviews. The vendor reports a library of over 4,250 questions and support for 14 popular coding languages.
Around that core sit Explore cards, Study Plan, Contest, and a Discuss forum. LeetCode also sells to the hiring side, with Online Interview and Assessment products for employers screening candidates.
The problem set and contests
The Problems catalogue is why most people arrive, and scale is the point — LeetCode reports over 4,250 questions to practice against. Contest adds a competitive layer; the homepage invites users to participate in contests to challenge yourself and earn rewards.
Discuss closes the loop, and LeetCode describes its community as one of the largest in tech, with hundreds of thousands of active users. That rhythm matters: interview prep usually fails from a lack of cadence, not a lack of questions.
Structured learning through Explore
LeetCode positions Explore as a well-organized tool that adds structure to your progress, and in practice it is a set of guided card decks. Browsing it without an account surfaces LeetCode's Interview Crash Course on Data Structures and Algorithms across 13 chapters, System Design for Interviews and Beyond at 16, and The LeetCode Beginner's Guide for people starting cold.
Narrower decks cover Arrays 101, Dynamic Programming, Graph, Heap, Recursion I, SQL Language, and Machine Learning 101. The sidebar also exposes Library, Quest, and Study Plan, so self-taught developers can follow a syllabus rather than guess at the next step. Some decks are gated — the Google interview card shows as Premium and locked.
What Premium unlocks
Premium is more than a paywall on extra questions. Company-Specific Interview Questions sorts real questions by role, time, or frequency, which is the highest-value feature for anyone with an onsite booked at a named employer. Interview Simulations add timed mock assessments against a chosen company.
The editor upgrades are practical: a Debugger with real breakpoints, Autocomplete tuned to your language, Cloud Storage across devices, and Unlimited Playgrounds with folders. LeetCode advertises Lightning Judge for priority judging, which the vendor says runs up to 10 times faster during peak hours. Newest is Ask Leet, a coding agent for brainstorming solutions, optimizing code, generating test cases, and debugging; the vendor reports Premium members receive 500 extra monthly credits and up to 30 solution analyses per day.
Playground and the employer side
Not all of LeetCode is interview drilling. The Developer section highlights Playground, which the vendor describes as a way to test, debug, and write your own projects online, with starter samples for Linked List, Binary Tree, and Fibonacci. It is a handy scratchpad when you want to try a language feature without setting up a local toolchain.
On the hiring side, LeetCode says it helps companies identify top technical talent, offering businesses services that range from sponsoring contests to online assessments and training. Candidates gain indirectly: fluency in the editor is worth something when an employer runs its screen on the same interface.
Who should choose LeetCode
LeetCode is the default for engineers prepping algorithmic interviews at product companies, and the free tier is unusually generous — thousands of problems, most Explore cards, contests, and the community cost nothing. Move to Premium when you have a named target and a date, because company-tagged questions and Interview Simulations are what the subscription genuinely buys.
It is a weaker fit for learning to program from scratch; the Beginner's Guide helps, but the platform assumes you can already write code and want to get faster at problem solving. Anyone seeking full-stack project work, front-end practice, or a broad CS curriculum will do better with a course-led platform.
Strengths
- Largest and most current problem library in the category (3,000+ questions), kept fresh with real interview-style problems
- Genuinely usable free tier — you can prepare for interviews without ever paying
- Company-tagged questions and frequency data (Premium) enable highly targeted, company-specific prep
- Active community: weekly contests, discussion threads, and shared solutions add depth beyond the official content
Watch out for
- Not a teaching platform — it drills problems but offers little structured curriculum or foundational instruction
- Official editorial solutions and company tags are locked behind Premium, and the annual plan is billed upfront with no clear refund
- Mock interviews lack real constraints (submission limits, live pressure) and don't fully replicate an interview
- Optimizing for the platform can encourage pattern memorization over genuine problem-solving skill
Key features
| Feature | What it does |
|---|
| Problem library | 3,000+ algorithm, data-structure, database, and shell problems across easy/medium/hard difficulty. |
| Company-tagged questions | Premium filters problems by employer (Google, Amazon, Meta, etc.) with frequency sorting for targeted prep. |
| Contests & ratings | Regular timed weekly and biweekly contests with a global rating system for competitive practice. |
| Editorials & mock assessments | Premium unlocks official written solutions with complexity analysis plus automated mock interview assessments. |
How LeetCode compares
| Alternative | How it differs |
|---|
| NeetCode | Curated roadmaps and video explanations that teach patterns LeetCode leaves you to figure out; cheaper lifetime option. |
| AlgoExpert | More structured, video-led curriculum for interview prep, but a much smaller curated question set. |
| HackerRank | Broader skills/certifications and employer assessments, but a weaker pure interview-prep problem set than LeetCode. |
Head-to-head: LeetCode vs HackerRank
Frequently asked questions
Is LeetCode free?
Yes. The free tier includes 3,000+ problems, contests, and forums — enough to prepare for interviews. Premium ($35/mo or $159/yr) adds company tags, official editorials, and mock assessments.
Is LeetCode Premium worth it?
It's most worthwhile if you're interviewing at a specific company within weeks and can already solve most mediums — the company-tagged, frequency-sorted questions are the main draw. If you're still learning fundamentals, the free tier or a teaching-focused tool is better value.
LeetCode ratings on other platforms
Independent user ratings from third-party review sites, linked here for transparency.
These are not our editorial score, are captured on the date shown, and may have changed since.