CS++ Java IDE

Now universal — runs on iPhone and iPad. Write Java, run instantly, work through 11 AP CSA units offline. No accounts, no ads, no tracking.

CS++ Java IDE is a focused, offline Java environment for students learning to code — and a complete AP Computer Science A practice platform.

Write code in a real Java IDE designed for touch. Run programs instantly with the bundled Java runtime — no internet, no compiler setup, no accounts. Tap Run and your code executes on your device.

WHAT'S INCLUDED • Multi-file Java editor with syntax highlighting, line numbers, auto-indent, and a templates menu • Bundled Java runtime — runs your code locally, even on airplane mode • Unit 1 free: 11 hand-picked starter problems covering primitive types, output, and your first algorithm • Full AP CSA course (one-time $9.99 unlock): 11 units, 50+ inline coding challenges, persistent progress • Pseudocode-to-Java translator for AP CSP students stepping up • System.out.println, Scanner input, exceptions, ArrayLists, classes, inheritance — every topic in the AP CSA Java subset

DESIGNED FOR LEARNING • Each challenge tests your output against expected results • Inline error messages with the exact line and what went wrong • "Format" button cleans up indentation in one tap • Templates dropdown loads common patterns: Scanner input, file reading, ArrayList traversal, recursion • Progress saved on-device — pick up where you left off

UNIVERSAL Built for iPhone and iPad. The editor and console scale from 4-inch phones to 13-inch iPads, with a full-bleed editor on phones to maximize coding space.

OFFLINE-FIRST No account creation. No login. No data sent off your device. Lessons, code, and progress all live in the app's local storage. Use it on a flight, in a classroom with no Wi-Fi, or anywhere.

THE FULL AP CSA COURSE Unlock all 11 units for $9.99 (one-time, no subscription):

1. Primitive Types & Output
2. Booleans & Conditionals
3. Iteration
4. Strings
5. Arrays
6. 2D Arrays
7. ArrayList
8. Recursion
9. Classes & Objects
10. Inheritance & Polymorphism
11. Searching & Sorting

Built by Yellow Dart Publishing for csplusplus.com — the College Board–aligned CS curriculum used by teachers across the U.S.