AtCoder vs GeeksforGeeks Practice

AtCoder is a free web service for competitive programming contests and practice. Users solve programming problems in Algorithm Contest and Heuristic Contest formats, and can run source code in a browser rather than setting up a local programming environment. Its practice library contains about 5,000 past problems with explanations, and it supports nearly all major programming languages, including C++, Python, Rust, Java, and C#. Beginner Contests take place weekly, Regular Contests about monthly, Grand Contests five to six times a year, and heuristic contests about monthly. Real-time participation in Algorithm or Heuristic contests changes a user's AtCoder rating. AtCoder Jobs lets users apply to companies using their rating for roles including internships and experienced positions. PAST is an online algorithm skills test available in Japanese and English, with problems updated every six months. AtCoder says it has about 200,000 registered users and about 10,000 participants in real-time contests weekly. Its terms limit members to one account and prohibit account sharing, lending, or transfer.

GeeksforGeeks Practice is a coding practice platform for developers and students, with problems to solve by topic, difficulty, company, or sort order. The Explore & Practice page lists 2,525 problems, while another listed library size is 2,518. Problems span Easy, Medium, and Hard levels and areas including arrays, strings, trees, graphs, dynamic programming, and searching. For interview preparation, GfG 160 groups problems by topic and difficulty and includes editorials and videos; Problem of the Day supports regular practice. Company-specific question sets name Microsoft, Google, Amazon, Adobe, Atlassian, and Samsung. The product overview lists C++, Java, and Python, while a broader language list also includes C, JavaScript, and C#. Android and iOS apps offer programming questions that users can edit and run, alongside web access. The service is freemium with a free plan. Its privacy policy says it may collect personal and usage data and may share coding activity with potential recruiters; account data is deleted within 15 days after account deletion, subject to stated exceptions.