Zig Has a Free API: The C Replacement That Actually Replaces C

C is 50 years old. C++ tried to fix it and became more complex. Zig actually fixes C — and interops with every C library ever written.

What Is Zig?

Zig is a systems programming language designed to be what C should have been. No hidden control flow, no hidden allocations, no undefined behavior by default.

const std = @import("std");

pub fn main() void {
    std.debug.print("Hello, {s}!\n", .{"World"});
}

Why Zig Over C/C++

1. No hidden control flow — In C++, operator overloading, destructors, and exceptions create invisible code paths. In Zig, what you see is what executes.

2. Comptime — Generics and metaprogramming at compile time:

fn max(comptime T: type, a: T, b: T) T {
    return if (a > b) a else b;
}

// Works with any numeric type — resolved at compile time
const result = max(i32, 10, 20);
const float_result = max(f64, 3.14, 2.71);

3. No undefined behavior — Integer overflow is an error, not a security vulnerability:

var x: u8 = 255;
x += 1; // Runtime error in debug, wrapping in release with @addWithOverflow

4. Drop-in C compiler — Zig can compile C and C++ code:

zig cc -o hello hello.c      # C compiler
zig c++ -o hello hello.cpp    # C++ compiler
# With cross-compilation built in!
zig cc -target x86_64-linux-gnu hello.c  # Cross-compile to Linux from macOS

C Interop

const c = @cImport({
    @cInclude("stdio.h");
    @cInclude("sqlite3.h");
});

pub fn main() void {
    var db: ?*c.sqlite3 = null;
    _ = c.sqlite3_open("test.db", &db);
    // Use any C library. No bindings needed. No FFI ceremony.
}

Import any C header. Call any C function. Link any C library. Zig reads C headers directly.

Cross-Compilation

# Build for any platform from any platform
zig build -Dtarget=x86_64-linux-gnu
zig build -Dtarget=aarch64-macos
zig build -Dtarget=x86_64-windows-gnu
zig build -Dtarget=wasm32-wasi

This is why Bun chose Zig. Why TigerBeetle chose Zig. Why Uber uses Zig.

Who Uses Zig

• Bun — the JavaScript runtime (1M+ users)
• TigerBeetle — financial transactions database
• Uber — cross-compiling C++ at scale
• Mach Engine — game engine

---

Building systems software? Check out my developer tools or email [e-mail].