Hack logo
A programming language for HHVM that interoperates seamlessly with PHP
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What is Hack?

Hack provides instantaneous type checking via a local server that watches the filesystem. It typically runs in less than 200 milliseconds, making it easy to integrate into your development workflow without introducing a noticeable delay.
Hack is a tool in the Languages category of a tech stack.

Who uses Hack?

Companies
55 companies reportedly use Hack in their tech stacks, including Facebook, Slack, and Wizters.

Developers
24 developers on StackShare have stated that they use Hack.

Hack Integrations

Why developers like Hack?

Here’s a list of reasons why companies and developers use Hack
Hack Reviews

Here are some stack decisions, common use cases and reviews by companies and developers who chose Hack in their tech stack.

StackShare Editors
StackShare Editors
HHVM (HipHop Virtual Machine)
Hack
PHP

Throughout 2016, Slack began migrating from PHP5 to Hack. They cite several well-known challenges inherent to PHP, including surprise type conversions, inconsistency around reference semantics, inconsistencies in the standard library, and the fact that “PHP tries very, very hard to keep the request running, even if it has done something deeply strange.”

To overcome these challenges while maintaining the unique values of PHP, Slack turned to Hack, a gradual typing system for PHP. Hack runs on the HipHop Virtual Machine, or HHVM, an open source just-in-time (JIT) environment for PHP.

See more
StackShare Editors
StackShare Editors
Apache Thrift
Kotlin
Presto
HHVM (HipHop Virtual Machine)
gRPC
Kubernetes
Apache Spark
Airflow
Terraform
Hadoop
Swift
Hack
Memcached
Consul
Chef
Prometheus

Since the beginning, Cal Henderson has been the CTO of Slack. Earlier this year, he commented on a Quora question summarizing their current stack.

Apps
  • Web: a mix of JavaScript/ES6 and React.
  • Desktop: And Electron to ship it as a desktop application.
  • Android: a mix of Java and Kotlin.
  • iOS: written in a mix of Objective C and Swift.
Backend
  • The core application and the API written in PHP/Hack that runs on HHVM.
  • The data is stored in MySQL using Vitess.
  • Caching is done using Memcached and MCRouter.
  • The search service takes help from SolrCloud, with various Java services.
  • The messaging system uses WebSockets with many services in Java and Go.
  • Load balancing is done using HAproxy with Consul for configuration.
  • Most services talk to each other over gRPC,
  • Some Thrift and JSON-over-HTTP
  • Voice and video calling service was built in Elixir.
Data warehouse
  • Built using open source tools including Presto, Spark, Airflow, Hadoop and Kafka.
Etc
See more

Hack Alternatives & Comparisons

What are some alternatives to Hack?
PHP
Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world.
JavaScript
JavaScript is most known as the scripting language for Web pages, but used in many non-browser environments as well such as node.js or Apache CouchDB. It is a prototype-based, multi-paradigm scripting language that is dynamic,and supports object-oriented, imperative, and functional programming styles.
Python
Python is a general purpose programming language created by Guido Van Rossum. Python is most praised for its elegant syntax and readable code, if you are just beginning your programming career python suits you best.
Java
Java is a programming language and computing platform first released by Sun Microsystems in 1995. There are lots of applications and websites that will not work unless you have Java installed, and more are created every day. Java is fast, secure, and reliable. From laptops to datacenters, game consoles to scientific supercomputers, cell phones to the Internet, Java is everywhere!
HTML5
HTML5 is a core technology markup language of the Internet used for structuring and presenting content for the World Wide Web. As of October 2014 this is the final and complete fifth revision of the HTML standard of the World Wide Web Consortium (W3C). The previous version, HTML 4, was standardised in 1997.
See all alternatives

Hack's Followers
47 developers follow Hack to keep up with related blogs and decisions.
ahmed_atayib
Mohamma76685757
bharathwaj 1421
Himansu Sekhar
André Eduardo Pérez Álvarez
Savil Srivastava
besufkad menji
DevAspirant
Jose Torres
Yunhui Huang