tumblr/colossus
I/O and Microservice library for Scala observed · 2026-08-28
Health v2 · maintenance only
23/100
- Activity 0
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 4313
- days_rel: n/a
- days_push: 1845
- n_releases_24m: 0
Adoption not part of the score
1129 stars · 95 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
Colossus is a lightweight I/O framework for building high-performance Scala microservices, including an HTTP server/client and a standalone metrics library. It was developed by Tumblr and participates in the TechEmpower web framework benchmarks.
Use cases
- build a scala microservice
- high-performance http server in scala
- non-blocking i/o service framework for jvm
- collect and report service metrics
- write scala http clients
When to choose
- you are building Scala services on the JVM and want a lightweight, non-blocking I/O framework
- you need a simple HTTP server/client with built-in metrics support
When to avoid
- your team primarily uses Java, Kotlin, or another non-Scala JVM language
- you need a framework with a large ecosystem and frequent updates, as the latest release dates to 2021
Facets
framework · maturity maintenance
http-server http-client microservices monitoring serialization testing backend microservices web-development developer-tools jvm scala nio high-performance service-framework metrics linux macos
1 source
- readme: https://github.com/tumblr/colossus · fetched 2026-08-28 · 060c3e372ef0
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| tumblr/colossus | main | 23 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem