Ladder — coding practice coach

Side-by-side coding practice coach for LeetCode, Codeforces, AtCoder and more. Progressive hints instead of instant answers.

Ladder is a side-by-side coding-practice coach for programming-problem sites. Instead of immediately showing a full answer, it helps you climb through five levels of assistance so you can get unstuck without skipping the learning. Start with a plain-English explanation of the problem, then reveal observations, the underlying approach, pseudocode, and finally a full solution only when you decide you need it. Key features: - Five progressive hint levels designed to avoid premature spoilers. - Beginner mode that explains unfamiliar terms instead of assuming prior knowledge. - Offline glossary support for common data-structure and algorithm vocabulary. - Code review, debugging guidance, optimization suggestions, and step-by-step traces. - Notes, progress tracking, and spaced-repetition review reminders stored locally in Chrome. - Works alongside popular coding-practice websites and can also be opened manually on other supported pages. - English, Traditional Chinese, Simplified Chinese, and Spanish interfaces. - Bring your own AI provider key, use a compatible endpoint, or run a local model with Ollama. Privacy is intentionally simple: Ladder has no developer-operated server, account system, analytics, advertising, or telemetry. API keys, settings, notes, and progress stay in your Chrome profile. When you explicitly request an AI-powered hint or review, the problem content and any code you choose to include are sent directly from your browser to the AI provider you configured. See the privacy policy for full details.