About Leet Study

A free, focused way to prepare for technical coding interviews.

Leet Study is a free coding-interview practice app built around a single idea: you get better at interviews by solving the right problems, in the right order, until the underlying patterns become second nature. Instead of dumping hundreds of unsorted problems on you, Leet Study groups them into a small set of recurring patterns — the same ones that show up again and again in real interviews — and walks you through them one curated step at a time.

Why we built it

Most people preparing for software-engineering interviews hit the same wall: there are thousands of practice problems online but almost no guidance on which ones to do or why. It's easy to grind for weeks and still feel unprepared, because random practice teaches a hundred specific tricks instead of a dozen transferable ideas. Leet Study turns a sprawling, intimidating catalog into a short, deliberate path you can actually finish.

How it works

• Curated tracks. Problems are grouped into themed tracks — Arrays & Hashing, Two Pointers, Sliding Window, Stacks, Binary Search, Trees, Graphs, Dynamic Programming and more — each ordered so every problem builds on the last.
• Pattern-first. Each track teaches a reusable pattern, with a plain-English explanation of when to reach for it and what signal in the problem statement should trigger it.
• Run real code in the browser. You solve problems in an in-browser editor and run them against test cases — Java and SQL execute right on the page — so you practice the way you're actually assessed.
• Spaced review. Flag tricky problems, mark concepts as known, and keep a streak so your practice compounds over days instead of evaporating.
• Concept deck. A swipeable deck of short conceptual questions reinforces the theory behind the patterns.

Who it's for

Students heading into their first internship loop, self-taught developers breaking into the industry, and working engineers brushing up before a job search. No account is required, and your progress is saved privately in your own browser.

Our approach to content

The pattern explanations, hints, and study guidance on Leet Study are written by us to be clear and beginner-friendly. We focus on the why behind each technique — the recognition cues, the common pitfalls, and the mental model — rather than just handing over an answer to memorize.

Contact

Found a bug or have a suggestion? Use the in-app "Report a bug" button — it comes straight to us, and we use it to decide what to build and fix next.