Adopters

Industrial

Banno Group inside of Jack Henry & Associates
Extensively utilizes http4s to deliver mission-critical banking services.
Cammy
Has about 10 services in production at thousands of requests per second.
ClearScore
Uses http4s for some API services.
Eckerd College
Uses http4s for several of its internal services.
Formation
Uses the client internally
HiFi
Uses http4s for internal web services
看录取 Kanluqu
College application resources for Chinese high school students, built entirely upon the Typelevel stack.
iHeartRadio
Uses http4s for internal web services
MYOB
Uses http4s for some API and Web services.
Netflix
Uses http4s for internal tools.
NetworkedAssets
Builds APIs and API clients with http4s.
Quantiply
Uses http4s to power the critical data APIs.
SecurityScorecard
Uses http4s to power its critical data pipeline.
Verizon
Uses http4s extensively in its internal services and open source projects.
Wegtam GmbH
Uses http4s to implement service and microservice architectures as well as web applications for customers.
Wolt
Uses http4s for some API services.

Libraries

Avias
Functional AWS API implementation for Scala
circuit-http4s
CircuitBreaker backed Http4s Middlewares
CouchDB-Scala
a purely functional Scala client for CouchDB
Helm
A native Scala client for interacting with Consul
http4s-directives
Implementation of unfiltered-directives using http4s
http4s-spnego
http4s middleware for HTTP SPNEGO Authentication (Kerberos)
http4s-timer
Adds timing capability to http4s, with a possible concrete implementation for New Relic
http4s-tracer
An end-to-end tracing system for http4s
kamon-http4s
Kamon support for http4s
pureconfig-http4s
Adds support for http4s’ Uri class to PureConfig.
rho
A self-documenting DSL built on http4s
tsec
A type-safe, functional, general purpose security and cryptography library
typedapi
Build your API on the type level

Open Source apps

0x7e.xyz
A simple link-shortener
Dashing
Dashboards to monitor an open source organization’s health
Docspell
A personal document (pdf) organizer
fink
A simple Scala-based content management system
fleet-buddy
Eve Online fleet buddy based on the CREST API
http4s-demo
an open source demo app built with http4s
http4sbin
A httpbin clone built with http4s
httpize
a httpbin built with http4s (source)
Nelson
Automated, multi-region container deployment
Raster Foundry
An open source tool for finding, analyzing, and publishing geospatial imagery on the web
scala-pet-store
An implementation of the java pet store using FP techniques in scala
scala-steward
Bot that keeps library dependencies and sbt plugins up-to-date
Sharry
A file-sharing web application
Smart Backpacker App
Backend of the traveler’s app using the Typelevel stack
todo-backend-typelevel
todo-backend implementation using the Typelevel stack
twitterstorm
Twitter Streaming API Processing Example Project
http4s-index
lists the files and folders becoming a simple light weight web server
http4s-chatserver
an open source demonstration of http4s WebSocket support and stateful functional streams

Giter8 templates

G8 templates provide a fast way to get started with SBT projects by just running sbt new <template-name>.

http4s.g8
Bootstrap Http4s services
http4s-app.g8
Bootstrap web apps based on Http4s including database migrations and on Typelevel Stack
http4s-tapir.g8
Bootstrap HTTP services using Http4s and sttp tapir (Typed API descRiptions)
typelevel-stack.g8
Typelevel Stack (Http4s / Doobie / Circe / Cats Effect / Fs2)

Add yourself, alphabetically, if you please.