Asymptote

See the Big-O as you type.

A VS Code and Cursor extension that statically analyzes the open file and shows the time and space complexity of every function inline, next to its signature. When it cannot prove a bound, it says O(?) instead of guessing.

VS Marketplace Open VSX

What it does

Inline time and space complexity, as ghost text
Honest about uncertainty: O(?) when it cannot prove a bound
Flags suspicious complexity, like an O(n²) sort
Static only. No network, no telemetry