# Nike-Inc/Willow

Willow is a powerful, yet lightweight logging library written in Swift.

Repository: https://github.com/Nike-Inc/Willow
Canonical: https://ross.abutalabs.com/products/nike-inc-willow
Language: Swift
License: MIT
License Family: permissive
Last push: 2025-02-10T17:25:18+00:00

## Health v2 (maintenance only)
Score: 26/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 6, release rhythm 8, longevity 100
- inputs: {"age_days": 3780, "days_push": 569, "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 1373, forks 80 (observed 2026-08-28T04:04:32.873140+00:00)

## What it is
Willow is a lightweight, powerful logging library written in Swift by Nike. It supports multiple log levels, custom writers and modifiers via dependency injection, and thread-safe synchronous or asynchronous log output.

## Use cases
- add logging to an iOS app in Swift
- log messages without blocking the main thread
- write log output to multiple destinations
- create custom log levels and writers
- share a logger across frameworks
- prevent garbled log output in concurrent code

## When to choose
- you need a lightweight Swift logging library for Apple platforms
- you want configurable sync/async logging with thread-safe output
- you need custom log writers or modifiers via dependency injection

## When to avoid
- you need structured or distributed logging with backends like ELK or Datadog
- your project is not on Apple platforms or Swift
- you need a logging solution with built-in log shipping or aggregation

## Facets
- artifact type: library
- maturity: maintenance
- function: logging
- domain: developer-tools, apple-ecosystem
- platform: -
- tags: swift, logging-library, thread-safe, cocoapods, carthage, apple-platforms, ios, macos

## Member repositories
- Nike-Inc/Willow (main) score 26

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:32.873140+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 2026-08-30T04:40:40.175365+00:00, confidence not recorded.
  - readme: https://github.com/Nike-Inc/Willow (fetched 2026-08-28T04:04:32.873140+00:00, sha c4ba1736f31a)
- Data as of 2026-08-30T08:39:29.467469+00:00.