# Zewo/Zewo

Lightweight library for web server applications in Swift on macOS and Linux powered by coroutines.

Repository: https://github.com/Zewo/Zewo
Canonical: https://ross.abutalabs.com/products/zewo
Homepage: http://zewo.io
Language: Swift
License: MIT
License Family: permissive
Topics: swift, coroutines, synchronous-apis, server-side-swift, zewo, swiftenv, concurrency, xcode, heroku, swiftpm, slack, buildpack, non-blocking, fibers, green-threads
Last push: 2020-03-26T16:31:25+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3953, "days_push": 2351, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1841, forks 87 (observed 2026-08-28T04:05:43.136573+00:00)

## What it is
Zewo is a lightweight Swift library for building web server applications using coroutines instead of asynchronous callback-based APIs. It provides Go-style concurrency (fibers/green threads via libmill) so server code can stay synchronous and readable, and serves as a modular foundation for building server-side Swift frameworks.

## Use cases
- build web servers in Swift with synchronous APIs
- avoid callback hell in server-side Swift
- use Go-style coroutines and green threads in Swift
- deploy Swift web apps on Linux servers
- build a custom web framework from modular components
- run non-blocking concurrent HTTP servers without GCD

## When to choose
- you want coroutine-based, synchronous-style concurrency in server-side Swift
- you're building your own Swift web framework and want modular building blocks
- you need lightweight non-blocking HTTP serving on macOS or Linux

## When to avoid
- you need an actively maintained project - the last release was March 2020
- you want a full-featured batteries-included web framework like Vapor
- you're targeting modern Swift concurrency (async/await) rather than libmill-based coroutines

## Facets
- artifact type: library
- maturity: abandoned
- function: web-framework, http-server, concurrency, routing, middleware
- domain: web-development, backend, developer-tools
- platform: -
- tags: coroutines, server-side-swift, green-threads, fibers, synchronous-apis, non-blocking-io, macos, linux, swift, docker

## Member repositories
- Zewo/Zewo (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:43.136573+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:18:00.945621+00:00, confidence not recorded.
  - readme: https://github.com/Zewo/Zewo (fetched 2026-08-28T04:05:43.136573+00:00, sha 9017a2e4aaa7)
  - homepage: http://zewo.io (fetched 2026-08-29T10:57:07.097676+00:00, sha 116547b25d67)
- Data as of 2026-08-30T08:39:29.467469+00:00.