Best essential concepts tools in 2025

Prepfox

Prepfox

Interactive coding interview preparation resource.

Free
open
💻 Coding practice • 🔧 Coding skills

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🔄 Adaptive 📚 Computer science concepts 🔄 Difficulty adjustment 📝 Interview prep 📈 Practice goals 🎤 STAR response skills 📝 Topic notes 📖 Tutorials access