IoLanguage/io

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

2803 stars · 311 forks observed · 2026-10-17

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Io is a small, dynamic prototype-based programming language implemented in C, inspired by Self, Smalltalk, Lisp, and Lua, where everything is a message send and concurrency is built on actors and futures. The VM now targets WebAssembly/WASI by default, running under wasmtime, Node.js, or in the browser with a REPL and an Io↔JavaScript bridge.

Use cases

• learn prototype-based programming
• embed a small scripting language in a C application
• run a scripting language in the browser via WebAssembly
• experiment with actor and future-based concurrency
• build DSLs with runtime-inspectable message trees
• study minimal language design

When to choose

• you want a tiny, conceptually unified language with minimal syntax
• you need runtime introspection and code-as-data (message trees)
• you want prototype-based objects with differential inheritance
• you want a language that runs in WASI hosts or the browser

When to avoid

• you need a large ecosystem or standard library
• you need raw throughput for production workloads
• you need a well-tested, production-hardened WASM target (still early-access)
• your team requires mainstream tooling and hiring pool

Facets

cli-tool · maturity active

interpreter programming-language concurrency programming-languages compilers wasm browser cross-platform c prototype-based actors futures wasi small-language lisp-inspired self-inspired browser-repl programming-language

Member repositories

For agents

markdown · JSON · MCP: product_card(name="IoLanguage/io")