C / C++ Compiler IDE

CosmoVex

Contains adsIn-app purchases

About this app

Write C and C++ code on your Android phone or tablet, compile it on-device, and run it right there. Truly offline. No account. No subscription. No ad break after every compile.

An on-device C and C++ IDE for engineering students, BTech CS learners, and anyone who wants to test a snippet on a bus, in a hostel, or at 30,000 feet. The compiler is bundled inside the app — your code never leaves your phone.

WHAT YOU GET

• Write C or C++ with syntax highlighting, auto-indent, line numbers, and a symbols bar for braces and angle brackets
• Multi-file projects — combine .c with .h, or .cpp with .h, in a single project. The Run button compiles every source file together and the linker finds whichever file holds main()
• Run on-device — no internet, no server round-trip, works in airplane mode
• Built-in terminal for output, stdin input, and exit codes
• Open and save .c, .cpp, and .h files from Downloads, Drive, SD card, or any folder your phone exposes
• Curated DSA problem bank — Arrays, Strings, Linked Lists, Trees, Dynamic Programming, Recursion, and Pointers
• Hint system that guides you step by step; one-tap solution unlock when you're stuck
• Memory and pointer visualiser — watch stack variables, addresses, and pointer targets as your program runs
• Plain-English explanations for compiler errors — missing semicolons, mismatched braces, undeclared variables, wrong format specifiers
• Full UI in 15 languages including Hindi, Bengali, Spanish, Portuguese, Indonesian, Arabic, Urdu, Turkish, Russian, French, German, Chinese, Japanese, Korean, and English
• Dark-first editor designed for long study sessions

WHY THIS IDE IS DIFFERENT

• No ad after every compile. Full-screen ads are occasional and rate-limited — never stacked on every run — so the build-and-test loop stays usable
• No monthly subscription. A one-time $2.99 Pro upgrade removes every ad forever — paid once, yours for life
• Truly offline. No internet, no account, no permission grabs. The compiler is in the app, not on a server
• Saves your work. Every project, every file, every edit is preserved on your device

SAMPLE PROJECTS INCLUDED

Four ready-to-fork sample projects ship with the app so you can see multi-file structure in action from day one:

• Hello Headers — a minimal C project with main.c plus a helper .h, demonstrating include guards
• Mini Calculator — a four-function C calculator split across calc.c, calc.h, and main.c, with stdin input
• Singly Linked List — a complete C linked-list implementation across list.c, list.h, and main.c
• C++ Classes — an introduction to C++ object orientation with classes split across .cpp and .h files

FOR STUDENTS

This IDE was built for the exact syllabus engineering and BTech CS students see every week. The curated problem bank covers Arrays, Strings, Linked Lists, Trees, DP, Recursion, and Pointers — the seven topics that show up in every interview and end-of-semester paper. The hint system nudges you forward without spoiling the answer; tap the solution unlock when you genuinely need it.

WHAT'S FREE, WHAT'S PRO

Free to install and use. Free includes the full editor, multi-file projects, every sample, the entire problem bank, the memory visualiser, and the plain-English error helper. Free shows a banner in safe surfaces, plus occasional, rate-limited full-screen ads — never one after every compile, and never two back-to-back.

The one-time $2.99 Pro upgrade removes every ad permanently. Flat price, paid once. No monthly charge, no auto-renew.

No account required. Your source files stay on your device. Standard analytics and crash reporting only.

Built by an indie developer at Cosmovex — makers of JSONVEdit, HTMLVEdit, XMLVEdit, CSVVEdit, JavaVEdit, JSVEdit, SVGVEdit, and the vedit family of offline editors.

Tags: c compiler, c++ compiler, c ide, c++ ide, cpp compiler, offline c compiler, learn c, learn c++, multi-file projects, header files, gcc, dsa practice, pointer visualizer, c for students

What’s new

• Fixed C and C++ compiling and running reliably on more devices.
• Reworked ads — occasional and rate-limited, never stacked on every run.
• Editor stability improvements.

If CVEdit helps your coding, a rating means a lot. Thank you!