LeetCode
HackerRank
Codewars
Devinterview.io
Exercism
GeeksforGeeks
CrackCode — 15-minute daily coding interview prep. Master DSA patterns, system design, and behavioral interviews one cup of tea at a time.

Duolingo
Memrise
Babbel
Rosetta Stone
Lingvist
Mondly
HelloTalk
Join the global language learning community, take language courses to practice reading, writing, listening and speaking and learn a new language. Learn English with busuu's .

Which is more popular?
Based on our record, Busuu seems to be more popular. It has been mentioned 14 times since March 2021.
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| Website | crackcode.dev | busuu.com |
| Company | — | Startup from the United Kingdom |
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Share your experience with using CrackCode.dev and Busuu. For example, how are they different and which one is better?
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Busuu caters to beginners and intermediates the lessons are quite short and have word recognition, fill-in-the-blanks, and videos to keep the learner engaged.
A language course was designed to combine language learning with the opportunity to interact in a virtual community. This language learning application incorporates the principles of Web 2.0 and tandem learning. The...
Busuu is a social app that lets you practice with native speakers. It helps you improve your speaking skills and learn about different cultures. This approach makes learning a language more fun and interactive.
Recommendations tracked on public social media and blogs since March 2021.

Tracking CrackCode.dev since May 2026.
Give https://busuu.com/ a go, I think it does a much better way of explaining words and grammar than Duolingo. Good luck! Source: almost 4 years ago
When I was starting out I used a subscription to Busuu and thought it was pretty good. They had listening exercises, vocab exercises, grammar/conjugation, and test exams. There's also a community feature where native speakers can correct... Source: almost 4 years ago
I have been studying French for a few years (I still don't feel I would be very beneficial to you unfortunately, however) and a good place to look for language partners that I have found is busuu.com . A big section of it is connection... Source: about 4 years ago
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Practice and level up your development skills and prepare for technical interviews.
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Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
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HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
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Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
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Babbel is a paid language learning service that aims to strike a balance between thoroughness and cost efficiency.
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