Leetcode Ninja
Will land you a software engineering job at a FAANG company
Leetcode Ninja launched on February 10, 2025 with 17 votes, #875 of 5,999 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
Desktop app. Press a shortcut to capture a leetcode-like problem silently from your browser. Get all possible solutions within seconds, with O-complexity explained. View your solution on any device within seconds via webview.
Find information, resources and relevant links for leetcodeninja.io. This domain may be for sale.
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As you solve LeetCode questions, you can mark them as hard, medium, or easy. The tool will then recommend questions you should review based on (1) how hard the question was for you and (2) how much time has passed since you last reviewed it. I'd recommend normally attempting LeetCode problems and just marking them as hard, medium, or easy for you at first so the tool knows which problems to recommend you review! Here's the theory behind spaced repetition and learning if interested: https://www.codecademy.com/article/spaced-repetition
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