You don't need anything fancy to write C — a plain text editor and a terminal are enough. But as programs grow, a good editor or IDE saves real time through syntax highlighting, inline error checking, and integrated debugging. Here's an overview of the most common choices.

Visual Studio Code (a free, lightweight editor — not to be confused with the full Visual Studio IDE) is the most common starting point for C programmers today. Installing Microsoft's official C/C++ extension adds syntax highlighting, autocomplete, inline error squiggles, and a built-in debugger UI that wraps gdb or lldb. It's free, runs the same way on Windows, macOS, and Linux, and stays out of your way until you need it.

CLion (from JetBrains) and Visual Studio (Microsoft's full IDE, distinct from VS Code) are heavier tools aimed at larger projects. They come with deep project management, refactoring tools, and static analysis built in. CLion works across all three major platforms and integrates well with CMake-based projects; Visual Studio is Windows-only but offers first-class integration with MSVC and the Windows debugging tools.

vim and emacs are terminal-native editors with a steep learning curve but enormous long-term payoff for developers who prefer to keep their hands on the keyboard. Paired with a C language server (like clangd), they offer autocomplete and inline diagnostics comparable to a full IDE, entirely inside a terminal. These are generally a choice made after some experience, not a starting point.