Master Python, JavaScript, Java, C++, Dart, Rust, Go & Swift with 14+ interactive tools. Powered by Gemini AI. Used by learners in the USA, Europe & worldwide. 100% free. No sign-up.
Learn Programming with AI
No prior experience needed. No complicated setup. Just download and start coding in minutes — for free.
Install Sum Code from Google Play in seconds. No account, no email, no credit card — completely free to start.
Choose from 8 programming languages: Python, JavaScript, Java, C++, Dart, Rust, Go, or Swift. Switch anytime.
Work through lessons, take AI-generated quizzes, practice in the code playground, and ask the AI tutor anything 24/7.
From beginner-friendly Python to blazing-fast Rust. Pick a language. Start coding. Let AI guide you.
Data Science, AI & ML
Web & Full-Stack
Flutter & Cross-Platform
Android & Enterprise
Systems & Competitive
Safe Systems Programming
Cloud & Microservices
iOS & macOS Apps
Every tool you need to learn, practice, and master programming — all powered by AI.
Write, run & test code in real-time with syntax highlighting for all 8 languages.
Test your knowledge with AI-generated multiple-choice questions adapted to your level.
Memorize syntax, functions, and patterns with spaced-repetition flashcards.
Build coding consistency with a new challenge every day. Keep your streak alive!
Save, organize & reuse your best code snippets across all projects.
Watch sorting, searching & graph algorithms animate step-by-step.
Find & fix hidden bugs in challenge code. Sharpen your debugging skills.
Generate quick reference guides for any programming topic instantly.
Practice coding interview questions from Google, Amazon, Meta & Microsoft.
Master coding patterns: two pointers, sliding window, DFS, BFS & more.
Compare code versions side-by-side to understand changes.
Analyze Big O time & space complexity of any code or algorithm.
Convert code between all 8 programming languages with one tap.
Build, test & debug regular expressions with live pattern matching.
Powered by Gemini 2.0 Flash. Get instant help, explanations, and code reviews — like having a senior developer by your side 24/7.
Paste code, get a clear line-by-line explanation in plain English.
AI identifies the issue, shows the fix, and explains why it broke.
Get professional-level feedback on code quality and best practices.
Describe what you need in plain English. AI writes production-ready code.
# You type:
def fibonacci(n):
if n <= 1:
return n
return fibonacci(n-1) + fibonacci(n-2)
This recursive Fibonacci has O(2ⁿ) time complexity. For better performance, use memoization or dynamic programming to achieve O(n). Want me to refactor it?
From beginners to experienced developers — Sum Code helps everyone level up their coding skills.
"Absolutely the best free coding app I've used. The AI tutor explains things better than most YouTube tutorials. I went from zero Python knowledge to writing scripts in 3 weeks."
"I was preparing for FAANG interviews and the Interview Prep + Algorithm Visualizer is incredible. Got my first Google interview callback after 6 weeks of daily practice."
"The Code Playground lets me test JavaScript and Python without any setup. Daily challenges keep me consistent. Been using it every day for 2 months — completely free!"
"Learning Rust was intimidating until Sum Code's AI tutor explained memory management in simple terms. The bug hunter game is addictive. Best programming app on Android."
"As a CS teacher, I recommend Sum Code to all my students. The flashcards + quizzes are excellent. The algorithm visualizer finally made BFS and DFS click for my students."
"Switched from a paid app costing $15/month to Sum Code which is completely free. The AI tutor is honestly better. Code Translator saved me hours converting Python to JavaScript."
See why developers choose Sum Code over SoloLearn, Mimo, and Codecademy.
| Feature | Sum Code ✦ | SoloLearn | Mimo | Codecademy |
|---|---|---|---|---|
| 100% Free | ✓ | Partial | Partial | Partial |
| AI Coding Tutor | ✓ | ✗ | ✗ | Paid |
| Algorithm Visualizer | ✓ | ✗ | ✗ | ✗ |
| Code Playground (All Languages) | ✓ | Limited | ✗ | ✓ |
| Interview Prep (FAANG) | ✓ | ✗ | ✗ | Paid |
| No Sign-Up Required | ✓ | ✗ | ✗ | ✗ |
| Bug Hunter Game | ✓ | ✗ | ✗ | ✗ |
| Code Translator (8 Languages) | ✓ | ✗ | ✗ | ✗ |
| No Ads | ✓ | ✗ | Paid | ✓ |
Everything you need to know about Sum Code — the free AI coding app.
Yes, Sum Code is 100% free to download and use — no ads, no sign-up required, no hidden fees. All core learning features including AI chat tutor, code playground, quizzes, flashcards, algorithm visualizer, and daily challenges are free forever. An optional Pro subscription unlocks advanced power-user tools.
Sum Code supports 8 programming languages: Python (data science, AI, automation), JavaScript (web development, Node.js), Java (Android, enterprise), C++ (systems, competitive programming), Dart (Flutter mobile), Rust (safe systems), Go (cloud, microservices), and Swift (iOS, macOS). Each language has structured lessons, AI quizzes, flashcards, and a dedicated code playground.
Sum Code offers a free AI coding tutor powered by Google Gemini 2.0, an algorithm visualizer, a bug hunter game, FAANG interview prep, and code translation between 8 languages — all completely free with no sign-up. These features are either unavailable or locked behind expensive subscriptions on SoloLearn, Mimo, and Codecademy.
Absolutely. Sum Code is designed for complete beginners and experienced developers alike. The AI tutor explains every concept in simple, plain English. Lessons are structured from the very basics. You need zero prior coding experience to start learning with Sum Code.
Yes. Sum Code includes dedicated Interview Prep with curated questions from Google, Amazon, Meta, and Microsoft. Combined with Pattern Practice (two pointers, sliding window, DFS, BFS, dynamic programming) and the Algorithm Visualizer, it's an excellent free tool for FAANG interview preparation.
Sum Code's AI tutor is powered by Google Gemini 2.0 Flash — one of the most advanced AI models available. Ask it to explain code, fix bugs, review code quality, generate code from plain English, or answer any programming question — available 24/7.
Sum Code is currently available on Android via Google Play Store. iOS support is planned for a future release.
Join thousands of learners from the USA, Europe, and worldwide mastering programming with AI. No sign-up. No ads. No credit card. Just code.
Free forever · No sign-up · No ads · Android · Available worldwide