ByteKata

Practice 52 data structures and algorithms challenges with guided hints, custom tests, step-by-step debugging, detailed results, and an offline Dart guide.

Build practical data structures and algorithms skills with focused coding challenges. ByteKata takes you from approachable warm-ups to demanding interview-style problems while keeping your work organized in a distraction-free mobile workspace. Solutions are written and tested in Dart.

PRACTICE INTERVIEW SKILLS

• Solve 52 challenges organized into 13 focused chapters
• Progress through beginner, easy, medium, and hard difficulty
• Study arrays, strings, hashing, linked structures, stacks, heaps, trees, binary search trees, graphs, backtracking, dynamic programming, sliding windows, and more
• Learn frequently asked patterns alongside less familiar techniques worth knowing

STAY FOCUSED ON MOBILE

• Move quickly between the problem, code editor, and test results
• Keep Run and Submit within reach while you write code
• Return directly to the relevant source location when an error includes a line and column
• Preserve your code and place as you move between sections

WRITE, RUN, AND DEBUG

• Work in a purpose-built editor with line numbers and syntax highlighting
• Run visible tests or create custom test cases with JSON inputs
• Compare actual and expected results, then reveal hidden test details when needed
• Keep diagnostic print output separate from the returned answer
• Investigate compile and runtime errors with available line and column details
• Watch supported solutions execute step by step

LEARN AS YOU GO

• Use a concise Dart reference for variables, conditions, loops, strings, character codes, lists, maps, collection methods, sorting, custom comparators, math functions, and more
• Reveal progressive hints only when you ask for them
• Unlock a worked explanation and reference solution after completing a challenge
• Move freely between the challenge workspace and the Dart reference

KEEP YOUR WORK

• Save progress and code drafts locally
• Export or import progress and saved code as a JSON backup
• Recheck every saved solution after evaluator updates
• Practice offline after installation without creating an account

FREE AND PREMIUM ACCESS The first challenge in every chapter is included. A single optional non-consumable Premium purchase unlocks the remaining challenges in all current and future chapters. Previous purchases can be restored from Settings.

ByteKata is designed for deliberate practice: understand the problem, form an approach, test the edge cases, and refine the code.