The mission of the Apache Portable Runtime (APR) project is to create and maintain software libraries that provide a predictable and consistent interface to underlying platform-specific implementations. The primary goal is to provide an API to which software developers may code and be assured of predictable if not identical behaviour regardless of the platform on which their software is built, relieving them of the need to code special-case conditions to work around or take advantage of platform-specific deficiencies or features.

The recommended releases of the several Apache Portable Runtime libraries are

• APR 1.7.6, released May 16, 2025
• APR-util 1.6.3, released February 1, 2023
• APR-iconv 1.2.2, released October 22, 2017

The Apache Software Foundation and the Apache Portable Runtime Project are proud to announce the General Availability of version 1.7.6 of the Apache Portable Runtime library. APR 1.7 brings a number of enhancements and bugfixes documented in CHANGES. Users of earlier versions are encouraged to update to this release.

For further details of this release, see the official announcement as well as the CHANGES-APR-1.7 file.

Download

Programmer's Manual: APR

The Apache Software Foundation and the Apache Portable Runtime Project are proud to announce the General Availability of version 1.6.3 of the APR Apache Portable Runtime Utility library. Users of earlier versions are encouraged to update to this release.

The main changes in this release are concerned with the third-party dependencies, including unbundling expat, and building with up-to-date versions of libraries such as OpenSSL and MySQL.

For further details of this release, see the official announcement as well as the CHANGES-APR-UTIL-1.6 file.

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Programmer's Manual: APR-util

After several years of development, APR is beginning to see use outside of the Apache HTTP Server. To encourage more people to investigate APR for their projects, here are a list of both Open Source and Commercial projects that are currently using APR. If you are using APR, and would like your project recognized, please send e-mail to the developer's mailing list.

The following is a list of supported development projects under the APR Project. All of the development happens on the indicated mailing lists. See mailing lists to learn how to take part in these discussions. Or, check the archives.

apr - a portable runtime library

• Source: apr
• Mailing list: dev@apr.apache.org
• Releases: apr releases
• API Documentation: apr docs (current stable branch), Using APR Pools
• Tutorial: An Introduction to APR covers the structure and basic concepts. See sample code.
• Test Coverage: apr test coverage

apr-util - a companion library to APR

• Source: apr-util
• Mailing list: dev@apr.apache.org
• Releases: apr-util releases
• API Documentation: apr-util docs (current stable branch)

apr-iconv - a portable implementation of the iconv() library

• Source: apr-iconv
• Releases: apr-iconv releases
• Mailing list: dev@apr.apache.org
• API Documentation: apr-iconv docs (current stable branch)

We hope this website starts you in the right direction. Please read the docs and tutorials for the project you are interested in. If you have suggestions of any sort, please feel free to send us an email at dev@apr.apache.org!