What is Faasta?

Faasta is a self-hosted Function-as-a-Service platform designed for Rust developers. It compiles Rust handlers as WASIp3 wasi:http/service components that run in-process using Wasmtime, eliminating container overhead. Functions receive SQL, key-value, and blob storage capabilities through wasi-cloud-core host APIs, with local defaults (SQLite, in-memory) that can be swapped for distributed backends (Postgres, Garage/S3, Valkey) without changing guest code. The platform includes a CLI (cargo-faasta) for creating, building, and deploying functions, and a server binary (faasta-server) that handles TLS, scheduling, and capability multiplexing. It targets developers who want serverless-style deployment without vendor lock-in or container complexity.

Should you self-host Faasta?

Faasta scores 39/100 on selfhost.directory (how scoring works) and ranks #5 of 7 in Serverless. It has 227 GitHub stars.

It shipped 10 stable releases in the past year. The latest, build-84, came out on 20 October 2026. New versions land roughly every 1 days.

Setup is advanced: plan for several services and some ongoing maintenance. It is MIT-licensed and written mostly in Rust.

Its closest alternative on selfhost.directory is faas (68/100, 26 253 stars). It scores higher overall, so compare the two before you pick. See Faasta vs faas side by side.