RefactorErl - Refactoring Erlang Programs

RefactorErl Download Page

Downloadable software in this page is covered by the GNU Lesser General Public License (version 3).

RefactorErl 2025.09

This is the latest public release of our Erlang source code analyser and refactoring tool, released on 15 September 2025.

This release contains a new build system using rebar3. The Windows build is not yet supported by this release. If you want to use RefactorErl on Windows please use RefactorErl 2025.05. The release introduce a new startup option (localserver), thus the tool can be used on a non-distributed BEAM node.

The main features are:

Security vulnerability checkers built into the query language
User-defined semantic and metric queries of program structures
Dependency analysis
Side effect analysis
Data-flow and dynamic function call analysis
Duplicated code detection and elimination
Module and function clustering
24 different refactoring steps
Layout preservation for unmodified source parts
Interactive and scriptable Erlang shell interface
QT based GUI
Web interface (support multiple users)
WX based GUI
CLI
GNU Emacs integration
Eclipse integration
Vim plugin
Three different storage: Mnesia, Kyoto Cabinet and C++ graph based

If you are new to RefactorErl, you should start by looking at the wiki page of RefactorErl.

Software Requirements

The following software are required to use the tool (newer versions are OK):

Erlang/OTP 25 or newer
The security checkers requires Erlang/OTP 25 or newer
C++ compiler (g++ 4.3.6 or a newer version) -- for the NIF graph, the Kyoto Cabinet, and the duplicated code detectors
There are other optional dependencies depending on the used features/interfaces of the tool. These dependencies are listed under the wiki page of the corresponding features.

Source Packages

The current release is available with three different representations, one is the Mnesia representation, one that uses a C++ graph representation (so called NIF graph) and the new Kyoto Cabinet representation. You can choose between them at startup.

This package contains the source code of the release. Compilation requires only Erlang/OTP and a C++ compiler if you want to use the the NIF graph, the Kyoto Cabinet, and the duplicated code detector. For installation instruction please check the corresponding wiki page.

Download RefactorErl 2025.09 Source in ZIP format

More information

If you have questions, suggestions, bug reports, or feature requests, feel free to contact the developers.

Older Releases

Version	Download	Notes
2025.07 (July, 2025)	Source package in ZIP format	This release contains a new build system using rebar3. The Windows build is not yet supported by this release. If you want to use RefactorErl on Windows please use RefactorErl 2025.05. The release supports the new language features introduced by OTP28. Triple-quoted strings are partially supported.
2025.05 (May, 2025)	Source package in ZIP format	This release contains improvements on the beam file loader components, removes the nitrogen-based ui and simplifies the yaws dependency. Analysing the new features of OTP27 is supported in the beam loader. The source-code based analysis covers language features up to OTP26. Triple-quoted strings are partially supported.
0.9.25.01 (January, 2025)	Source package in ZIP format	This release adds support for the new Erlang 27 language features in the beam analyisis.
0.9.24.12 (December, 2024)	Source package in ZIP format	This release adds support for map comprehensions
0.9.24.11 (November, 2024)	Source package in ZIP format	Vulnerability checker improvements, parser improvements
0.9.24.01 (January, 2024)	Source package in ZIP format	Vulnerability checker improvements, parser improvements
Prerelease (October, 2023)	Source package in ZIP format	Vulnerability checker improvements, include file handler improvements
Prerelease (August, 2022)	Source package in ZIP format	Vulnerability checkers, Erlang 24 compatibility fixes, improvements
0.9.20.08 (August, 2020)	Source package in ZIP format	Fixes, new queries, new checkers, improvements
0.9.15.04 (updated) (May, 2017)	Source package in ZIP format Release notes	Compatibility fixes
0.9.15.04 (April, 2015)	Source package in ZIP format Source package in tar.gz format Release notes	New graph viewer, Clone Identifier, QT GUI
0.9.14.09 (September, 2014)	Source package in ZIP format Source package in tar.gz format Release notes	New graph viewer, Clone Identifier, QT GUI
0.9.14.03 (March, 2014)	Source package in ZIP format Source package in tar.gz format Release notes	Minor fixes
0.9.14.02 (February, 2014)	Source package in ZIP format Source package in tar.gz format Release notes	New web interface improvements
0.9.13.12 (December, 2013)	Source package in ZIP format Source package in tar.gz format Release notes	New web interface and WX based GUI
0.9.13.05 (May, 2013)	Source package in ZIP format Source package in tar.gz format Release notes	Web interface and semantic query improvements
0.9.13.02 (February, 2013)	Source package in ZIP format Source package in tar.gz format Release notes	Web interface and semantic query improvements
0.9.12.09 (Sep, 2012)	Source package in ZIP format Source package in tar.gz format Release notes	Interface improvements (Web: investigations, Emacs, VI)
0.9.12.05 (May, 2012)	Source package in ZIP format Source package in tar.gz format Release notes	Web interface improvements (new dependency graph visualisation) and prototype duplicated code detection
0.9.12.04 (April, 2012)	Source package in ZIP format Source package in tar.gz format Release notes	Web interface and dependency analysis improvements
0.9.12.01 (January, 2012)	Source package in ZIP format Source package in tar.gz format Manual	Semantic query and web interface improvemnets
0.9.11.10 (October, 2011)	Source package in ZIP format (Mnesia) Source package in tar.gz format (Mnesia) Manual	Semantic query and web interface improvemnets
0.9.11.10 (October, 2011)	Source package in ZIP format (NIF) Source package in tar.gz format (NIF) Manual	NIF based graph representation
0.9.11.08 (August, 2011)	Source package in ZIP format Source package in tar.gz format	Improved initial loading and web interface
0.9 (June, 2011)	Source package in ZIP format Source package in tar.gz format	Improved web interface, new Eclipse and VIM plugin, parallel query execution
0.8A.10.12 (December, 2010)	Source package in ZIP format Source package in tar.gz format	Improved semantic queries, and interfaces
0.8A.10.11 (November, 2010)	Source package in ZIP format Source package in tar.gz format	Improved semantic queries, CLI and Scriptable interface
0.8A (October 31, 2010)	Source package in ZIP format Source package in tar.gz format	Improved web interface for semantic queries; prototype CLI and Scriptable interface
0.7A.10.10 (October 2010)	Source package in ZIP format Source package in tar.gz format	Prototype web interface for semantic queries
0.7A.10.07 (July 2010)	Source package in ZIP format Source package in tar.gz format	Console interface for semantic queries
0.7A (July 2010)	Source package in ZIP format Source package in tar.gz format	Semantic query language improvements
0.6.2 (Nov 2009)	Source package in ZIP format Source package in tar.gz format	Semantic queries
0.6.1 (Jun 2009)	Source package in ZIP format Source package in tar.gz format	New refactoring steps
0.6 (Apr 2009)	Source package in ZIP format Source package in tar.gz format	New pretty printer, internal improvements
0.5 (Nov 2008)	Source package in ZIP format Source package in tar.gz format	15 transformations are working
0.4 (Aug 2008)	Source package in ZIP format Source package in tar.gz format	Transformation in the new structure
0.2.1 (May 2008)	Windows Installer Source package in ZIP format Source package in tar.gz format	New refactoring: Inline function
0.3 (Feb 2008)	Source package in ZIP format Source package in tar.gz format	New representation, only the parser
0.2 (Oct 2007)	Windows Installer Source package in ZIP format Source package in tar.gz format	Experimental tuple to record
0.1.1 (Sep 2007)	Windows Installer Source package in ZIP format Source package in tar.gz format	Small fixes, support for MacOS
0.1 (Aug 2007)	Windows Installer Source package in ZIP format Source package in tar.gz format	First public version

Software development supported by Ericsson Hungary.

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Materials were created, authored, and/or prepared by the Authors at Department of Programming Languages and Compilers, University Lorand Eotvos, Hungary, Budapest, ELTE-Soft Ltd. for Ericsson Hungary under the agreement between Ericsson Hungary, ELTE-Soft Ltd. and ELTE IKKK. Unless otherwise specifically stated, no claim to copyright is being asserted and it may be freely used as in the public domain in accordance with LGPL-3.0. All rights, including copyright, are owned or controlled for these purposes by the Ericsson Hungary.