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https://github.com/zio/zio

ZIO — A type-safe, composable library for async and concurrent programming in Scala
https://github.com/zio/zio

asynchronicity asynchronous asynchronous-programming concurrency concurrent concurrent-data-structure concurrent-programming effects functional-programming promises queues scala stm streams zio

Last synced: about 1 month ago
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ZIO — A type-safe, composable library for async and concurrent programming in Scala

Awesome Lists containing this project

README 

        
![ZIO Logo](./ZIO.png)



| Project Stage | CI | Release | Snapshot | Issues |

| --- | --- | --- | --- | --- |

| [![Project stage][Badge-Stage]][Badge-Stage-Page] | ![CI][Badge-CI] | [![Release Artifacts][Badge-SonatypeReleases]][Link-SonatypeReleases] | [![Snapshot Artifacts][Badge-SonatypeSnapshots]][Link-SonatypeSnapshots] | [![Average time to resolve an issue][Badge-IsItMaintained]][Link-IsItMaintained] |



| Scaladoc | Scaladex | Discord | Twitter | Gitpod |

| --- | --- | --- | --- | --- |

| [Scaladoc][Link-Scaladoc] | [![Badge-Scaladex-page]][Link-Scaladex-page] | [![Badge-Discord]][Link-Discord] | [![Badge-Twitter]][Link-Twitter] | [![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/zio/zio) |



# Welcome to ZIO



ZIO is a zero-dependency Scala library for asynchronous and concurrent programming.



Powered by highly-scalable, non-blocking fibers that never waste or leak resources, ZIO lets you build scalable, resilient, and reactive applications that meet the needs of your business.



 - **High-performance**. Build scalable applications with minimal runtime overhead.

 - **Type-safe**. Use the full power of the Scala compiler to catch bugs at compile time.

 - **Concurrent**. Easily build concurrent apps without deadlocks, race conditions, or complexity.

 - **Asynchronous**. Write sequential code that looks the same whether it's asynchronous or synchronous.

 - **Resource-safe**. Build apps that never leak resources (including threads!), even when they fail.

 - **Testable**. Inject test services into your app for fast, deterministic, and type-safe testing.

 - **Resilient**. Build apps that never lose errors, and which respond to failure locally and flexibly.

 - **Functional**. Rapidly compose solutions to complex problems from simple building blocks.



To learn more about ZIO, see the following references:



 - [Homepage](https://zio.dev/)

 - [Contributor's Guide](docs/contributor-guidelines.md)

 - [License](LICENSE)

 - [Issues](https://github.com/zio/zio/issues)

 - [Pull Requests](https://github.com/zio/zio/pulls)



---



# Adopters



Following is a partial list of companies happily using ZIO in

production to craft concurrent applications.



Want to see your company here? [Submit a PR](https://github.com/zio/zio/edit/series/2.x/README.md)!



* [AdGear / Samsung Ads](https://adgear.com/en/)

* [Adidas](https://www.adidas.com/)

* [adpulse.io](https://www.adpulse.io/)

* [adsquare](https://www.adsquare.com/)

* [Amazon](https://www.amazon.com/)

* [Anduin Transactions](https://www.anduintransact.com/)

* [AnyMind Group](https://anymindgroup.com)

* [Ayolab](https://www.ayolab.com/)

* [Asana](https://asana.com/)

* [Aurinko](https://www.aurinko.io/)

* [auto.ru](https://auto.ru)

* [AutoScout24](https://www.autoscout24.de)

* [Avast](https://www.avast.com)

* [Bank of America](https://www.bofa.com)

* [Believe](https://www.believe.com)

* [Blue Insight Digital](https://www.blueinsight.digital/)

* [BlueLabs](https://www.bluelabs.eu/)

* [Bpp](https://www.bpp.it/)

* [Broad](https://broad.app)

* [Caesars Digital](https://www.caesars.com/sportsbook-and-casino)

* [CalcBank](https://www.calcbank.com.br)

* [Call Handling](https://www.callhandling.co.uk/)

* [Carvana](https://www.carvana.com)

* [Cellular](https://www.cellular.de)

* [ChannelPilot](https://channelpilot.com/de)

* [Chartboost](https://chartboost.com)

* [Cloudfarms](https://cloudfarms.com)

* [CodeComprehension](https://codecomprehension.com)

* [Codept](https://www.codept.de/)

* [Colisweb](https://www.colisweb.com/en)

* [Collibra](https://www.collibra.com/)

* [Compellon](https://www.compellon.com/)

* [Complicated Robot](https://www.complicatedrobot.com/)

* [Conduktor](https://www.conduktor.io)

* [Contramap](https://www.contramap.dev)

* [Coralogix](https://coralogix.com)

* [Credit Karma](https://creditkarma.com)

* [CurrencyCloud](https://www.currencycloud.com/)

* [D.E.Solution](https://de-solution.com/)

* [DaSCH](https://dasch.swiss/)

* [DataChef](https://datachef.co)

* [Demandbase](https://www.demandbase.com)

* [Demyst](https://demyst.com)

* [Devsisters](https://devsisters.com/)

* [DHL Parcel The Netherlands](https://www.werkenbijdhl.nl/it)

* [Disney+ Streaming](https://www.disneyplus.com/)

* [Doomoolmori](https://doomoolmori.com/)

* [Dow Jones](https://www.dowjones.com)

* [DPG recruitment](https://www.dpgrecruitment.nl)

* [Dream11](https://dream11.com)

* [Deutsche Telekom IoT GmbH](https://iot.telekom.com/en)

* [eBay](https://www.ebay.com)

* [Eaglescience](https://www.eaglescience.nl)

* [Electricité de France (EDF)](https://www.edf.fr/)

* [EnelX](https://www.enelx.com)

* [Evolution](https://evolution.engineering)

* [Evo](https://evo.company)

* [Flipp](https://flipp.com/)

* [Fugo.ai](https://www.fugo.ai)

* [Garner Distributed Workflow](https://www.garnercorp.com/)

* [Glean](https://www.gleancompany.com)

* [GrandParade](https://grandparade.co.uk)

* [greyflower.media GmbH](https://greyflower.media)

* [Hunters.AI](https://hunters.ai)

* [Hypefactors](https://hypefactors.com/)

* [iHeartRadio](https://www.iheart.com/)

* [IHS Markit](https://ihsmarkit.com/)

* [Investsuite](https://investsuite.com/)

* [Invia](https://www.invia.cz/)

* [Kaizen Solutions](https://kaizen-solutions.net/)

* [Kamon APM](https://kamon.io/)

* [Kodmagi](https://www.kodmagi.se)

* [Kensu](https://kensu.io)

* [LambdaWorks](https://www.lambdaworks.io/)

* [LeadIQ](https://leadiq.com)

* [Lernkunst](http://www.lernkunst.com/)

* [LiveIntent Inc.](https://liveintent.com)

* [Lottoland](https://lottoland.com)

* [MATECHS](https://matechs.com)

* [Megogo](https://megogo.net)

* [MOIA](https://www.moia.io)

* [Mylivn](https://www.mylivn.com/)

* [NewMotion](https://newmotion.com)

* [Nexxchange](https://www.nexxchange.com)

* [Nike](https://nike.com)

* [NsLookup](https://www.nslookup.io)

* [Ocado Technology](https://ocadotechnology.com)

* [Olyro GmbH](https://olyro.de)

* [Optrak](https://optrak.com)

* [Performance Immo](https://www.performance-immo.com/)

* [Pirum](https://www.pirum.com/)

* [PITS Global Data Recovery Services](https://www.pitsdatarecovery.net/)

* [Playtika](https://www.playtika.com)

* [PPC Samurai](https://ppcsamurai.com/)

* [Prezi](https://prezi.com/)

* [Radix Labs](https://www.radix.bio/)

* [Railroad19](https://www.railroad19.com)

* [Randstad Groep Nederland](https://www.werkenbijrandstad.nl)

* [Rapidor](https://www.rapidor.co)

* [PIM Solutions](https://pimsolutions.ru/)

* [Remember The Milk](https://www.rememberthemilk.com/)

* [REWE Digital](http://rewe-digital.com/)

* [LKWfee](https://lkwfee.de/)

* [Risk Ident](https://riskident.com/)

* [Rocker](https://rocker.com/)

* [Rudder](https://www.rudder.io/)

* [Samsung Food](https://samsungfood.com/)

* [Sanjagh](https://sanjagh.pro/)

* [Scalac](https://scalac.io/)

* [SecurityScorecard](https://www.securityscorecard.io/)

* [SentinelOne](https://www.sentinelone.com/)

* [Signicat](https://www.signicat.com/)

* [Société Générale Corporate and Investment Banking](https://info.sgmarkets.com/en/)

* [SoftwareMill](https://softwaremill.com/)

* [StreamWeaver](https://www.streamweaver.com/)

* [Stuart](https://stuart.com/)

* [Teads](https://teads.com)

* [The Pokemon Company International](https://www.pokemon.com/us/about-pokemon/)

* [TomTom](https://tomtom.com)

* [Tinka](https://www.tinka.com/)

* [Tinkoff](https://tinkoff.ru)

* [Trackabus](https://trackabus.com)

* [Trainor](https://www.trainor.no)

* [Tranzzo](https://tranzzo.com)

* [TreuTech](https://treutech.io)

* [Tweddle Group](https://tweddle.com)

* [Undo](https://www.undo.app)

* [Unit](https://unit.co)

* [Univalence](https://univalence.io)

* [Unzer](https://www.unzer.com)

* [Vakantiediscounter](https://www.vakantiediscounter.nl)

* [Verbund AG](https://www.verbund.com)

* [Waylay](https://www.waylay.io/)

* [Wehkamp](https://www.wehkamp.nl)

* [Wefunder](https://wefunder.com)

* [Wolt](https://www.wolt.com/)

* [Yandex.Classifieds](https://o.yandex.ru)

* [Audela](https://audela.ca)

* [Valamis Group](https://valamis.com)

* [Valsea](https://valsea.com)

* [VirtusLab](https://virtuslab.com/)

* [Vish](https://getvish.com)

* [Vivid Money](https://vivid.money)

* [Zalando](https://zalando.com/)

* [Zooz](https://zooz.com/)



# Sponsors



[![Ziverge][Image-Ziverge]][Link-Ziverge]



[Ziverge][Link-Ziverge] is a leading contributor to ZIO.



[![Scalac][Image-Scalac]][Link-Scalac]



[Scalac][Link-Scalac] sponsors ZIO Hackathons and contributes work to multiple projects in ZIO ecosystem.



[![Septimal Mind][Image-SeptimalMind]][Link-SeptimalMind]



[Septimal Mind][Link-SeptimalMind] sponsors work on ZIO Tracing and continuous maintenance.



[![YourKit][Image-YourKit]][Link-YourKit]



[YourKit][Link-YourKit] generously provides use of their monitoring and profiling tools to maximize the performance of ZIO applications.



---



# [Learn More on the ZIO Homepage](https://zio.dev/)



---



## Code of Conduct



See the [Code of Conduct](docs/code-of-conduct.md)



---



## Support



Come chat with us on [![Badge-Discord]][Link-Discord].



---



### Legal



Copyright 2017 - 2024 John A. De Goes and the ZIO Contributors. All rights reserved.



[Link-Codecov]: https://codecov.io/gh/zio/zio?branch=master "Codecov"

[Link-IsItMaintained]: http://isitmaintained.com/project/zio/zio "Average time to resolve an issue"

[Link-Scaladoc]: https://javadoc.io/doc/dev.zio/zio_3/latest/zio/index.html

[Link-Scaladex-page]: https://index.scala-lang.org/zio/zio/zio "Scaladex"

[Link-SonatypeReleases]: https://oss.sonatype.org/content/repositories/releases/dev/zio/zio_3/ "Sonatype Releases"

[Link-SonatypeSnapshots]: https://oss.sonatype.org/content/repositories/snapshots/dev/zio/zio_3/ "Sonatype Snapshots"

[Link-Ziverge]: https://ziverge.com "Ziverge"

[Link-Scalac]: https://scalac.io "Scalac"

[Link-SeptimalMind]: https://7mind.io "Septimal Mind"

[Link-YourKit]: https://www.yourkit.com "YourKit"

[Link-Discord]: https://discord.gg/2ccFBr4 "Discord"

[Link-Twitter]: https://twitter.com/zioscala



[Badge-CI]: https://github.com/zio/zio/workflows/CI/badge.svg

[Badge-Codecov]: https://codecov.io/gh/zio/zio/coverage.svg?branch=master "Codecov"

[Badge-IsItMaintained]: http://isitmaintained.com/badge/resolution/zio/zio.svg "Average time to resolve an issue"

[Badge-Scaladex-page]: https://index.scala-lang.org/zio/zio/zio/latest.svg "Scaladex"

[Badge-SonatypeReleases]: https://img.shields.io/nexus/r/https/oss.sonatype.org/dev.zio/zio_3.svg "Sonatype Releases"

[Badge-SonatypeSnapshots]: https://img.shields.io/nexus/s/https/oss.sonatype.org/dev.zio/zio_3.svg "Sonatype Snapshots"

[Badge-Discord]: https://img.shields.io/discord/629491597070827530?logo=discord "chat on discord"

[Badge-Twitter]: https://img.shields.io/twitter/follow/zioscala.svg?style=plastic&label=follow&logo=twitter

[Badge-Stage]: https://img.shields.io/badge/Project%20Stage-Production%20Ready-brightgreen.svg

[Badge-Stage-Page]: https://github.com/zio/zio/wiki/Project-Stages



[Image-Ziverge]: ./website/static/img/ziverge.png "Ziverge"

[Image-Scalac]: ./website/static/img/scalac.svg "Scalac"

[Image-SeptimalMind]: ./website/static/img/septimal_mind.svg "Septimal Mind"

[Image-YourKit]: ./website/static/img/yourkit.png "YourKit"