Wasmtime

wasmtime

A standalone runtime for WebAssembly.

Runs as wasmtime|macOS, Linux, Windows|wasmtime.dev

Open form in Otty otty.toml

Command form

ai-draft · 2 tasks · 4 fields

Run a .wasm or .wat file, optionally calling one export. Wasmtime flags must precede the file; program arguments follow it. The -O/-C/-D/-W/-S tuning options are left out.

Opens the form; the finished command lands at your prompt, unrun

Run in Otty

otty gui wasmtime

Run a WebAssembly fileExample values, fixed in this page — nothing here reaches a terminal

Basic

WebAssembly file*

file

Program arguments

string

Directory to expose to the program

directory

TasksEach one presets the form for one job

Run a program

moduleargsdir

Call one export

moduleinvokeargs

ParametersOnly these flags are editable in the form

Directory to expose to the program

path · repeatable

--dir

Export to invoke instead of the main entry

string

--invoke

WebAssembly file

path · positional 0

Program arguments

string · positional 1 · repeatable

SourcesEvery flag above is checked against these

docs

wasmtime run foo.wasm wasmtime foo.wat wasmtime --dir . foo.wasm wasmtime run --invoke initialize foo.wasm wasmtime run --invoke add add.wasm 1 2 All Wasmtime options must come before the WebAssembly file provided. All arguments afterwards are passed to the WebAssembly file itself.

manual2026-10-27

docs.wasmtime.dev

Before it fills your prompt, Otty checks the installed wasmtime against its version. A form that does not match your version is not offered.