What's new

Jep 4.1 release | June 2026
Updated to Java 21, JavaCC 7.0, and JUnit 6. New static factory methods, overloaded functions framework, range operator in core, parallel parsing, dictionaries, AssignableList destructuring, and more.

Jep Extension 2.2 release | June 2026
Chained and Stream packages for stream-style notation with map/fold/filter. Lambda package reworked with higher-order functions, rewrite matrix rules for symbolic vector/matrix algebra, and MatrixIf/MatrixSwitch.

GWTJep 0.1 beta releases | September 2022
First beta release of JavaScript version of Jep.

Jep 4.0 releases | April 2021
Major release. Improved support of non-thread safe functions, faster evaluation and supports for Java Modules.

Jep Extension 2.1 releases | April 2021
Adds symbolic operations like differentiation, structured programming constructs, and a type system with rational number and matrices. Bug fix release and support for Java Modules.

Jep 3.5 releases | July 2018
After a long wait the next release of Jep is now out. This adds internationalization support and improved multi-thread evaluation.

Jep Extension 2.0 releases | July 2018
Along with Jep 3.5 an extensions package is also released. This adds symbolic operations, structured programming constructs, and a type system with rational number and matrices.

Jep 3.4 releases | Nov. 2010
The last few months have seen two new releases of Jep Java (now at 3.4) and Jep.Net (now at 1.1). Check out the product pages for more details on the changes.

Jep.Net 1.1 Release | Jun. 2010
We are proud to announce the release of Jep.Net v1.0! This is a careful, hand-crafted port of the 3.2 version of Jep to the .Net framework. This product represents a perfect meld of .Net innovations and years of development and refinement of the original Jep parser and evaluator.

For more information and a trial download visit the Jep.Net page.

Jep Java

Java Math Expression Parser

Jep Java is a library for parsing and evaluating mathematical expressions. With this API you can allow your users to enter an arbitrary formula as a string, and instantly evaluate it. Have a look at the Jep console to see Jep in action!

Jep Extensions

Jep addons

Jep Extensions adds numerous features to Jep: symbolic operations like differentiation; a type system with matrices, rational numbers, and custom types; very fast evaluation for pre-compiled expressions; limited structured programming with for and while loops; statistical functions and distributions, lambda expressions.

Jep.Net

Math Expression Parser for .Net

Just like Jep Java, Jep.Net is a library for parsing and evaluating mathematical expressions except as a .Net component.

Be sure to check out the trial version which includes a number of excellent demonstrations of how this library could be put to use in your next project. You will be impressed with the extendible architecture, ease-of-use, and speed of Jep.Net.

GWTJep

Jep for javascript

A version of Jep for use with javascript GWTJep is a cross-compiled using Googles Google Web Toolkit.

AutoAbacus

Equation solving library

AutoAbacus is a powerful equation solving library that finds solutions to equation sets with a snap. Equations are passed to AutoAbacus as text, while the program attempts to find a solution that satisfies all constraints.