Welcome to OpenSolver, the Open Source linear, integer and non-linear optimizer for Microsoft Excel.

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The latest stable version,OpenSolver 2.9.0(12 Jan 2018) is available for download; this adds the SolveEngine from Satalia as a solver. OpenSolver 2.9.3 Beta Release version is now also available for download. Refer to the release blog for the new 2.7, 2.8, 2.8.3,2.8.4, 2.8.5, 2.8.6, 2.9.0 & 2.9.3 improvements. View all releases.

OpenSolver for Google Sheets; see our dedicated OpenSolver for Google Sheets page for more info on the Google Sheets versions of OpenSolver.

COIN-OR Cup Winner: We are pleased to announce that OpenSolver is the winner of the 2011 INFORMS COIN-OR Cupsponsored by IBM. Thanks, COIN-OR, for this honour.

OpenSolver is an Excel VBA add-in that extends Excel’s built-in Solver with more powerful solvers. It is developed and maintained by Andrew Mason and students at the Engineering Science department, University of Auckland, NZ. Recent developments are courtesy of Jack Dunn at MIT.

OpenSolver provides the following features:

• OpenSolver offers a range of solvers for use in Excel, including the excellent, Open Source, COIN-ORCBC optimization engine which can quickly solve large Linear and Integer problems.
• Compatible with your existing Solver models, so there is no need to change your spreadsheets
• No artificial limits on the size of problem you can solve – have as many variables and constraints as your computer memory allows (but be aware that large problems can be slow to solve)
• OpenSolver is free, open source software.

As well as providing replacement optimization engines, OpenSolver offers:

• A built-in model visualizer that highlights your model’s decision variables, objective and constraints directly on your spreadsheet
• A fast QuickSolve mode that makes it much faster to re-solve your model after making changes
• An algorithm to build and update the model only using information present on the sheet
• A modelling tool that we think improves on the built-in Solver window

OpenSolver has been developed for Excel 2007/2010/2013/2016 (including the 64bit versions) running on Windows, and supports Excel for Mac 2011 on Mac OS X, with limited support for Excel for Mac 2016. We currently test against Excel 2010/2013/2016 on Windows 7 and Windows 10, and Excel 2011/2016 on OS X 10.7 through 10.11. Note that we do not check our code against other versions of Excel or Windows/Mac than these. Best violin vst free download. This means we cannot guarantee that the latest release will work on old versions. However, please give it a go and let us know of any problems so we can fix them.

You can download OpenSolver.zip (which is hosted on our Open Solver Source Forge site). Version details (and dates of updates) are shown on the blog page.

SolverStudio is a free alternative to OpenSolver that is better suited to larger problems. Available as a free download, SolverStudio lets you use Excel to edit, save and solve optimisation models built using modelling languages such as the Python-based PuLP, AMPL, GAMS, GMPL, COOPR/Pyomo and Gurobi’s Python interface. The latest release allows GAMS and AMPL modesl to be solved in the cloud using the excellent free NEOS servers. The SolverStudio interface is fully Excel-based, with the model being edited and run from Excel and stored inside the Excel file. This approach provides a much better modelling solution for complex optimisation problems. Check out the screen shots to see how it works. SolverStudio is much better and faster for large problems. However, OpenSolver is still a great tool for simpler models, or spreadsheets that must be compatible with the built-in Solver.

OpenSolver is being developed by Andrew Mason in the Department of Engineering Science at the University of Auckland, and Iain Dunning. Kat Gilbert also made valuable contributions to the code while working as a summer student. Current development is lead by Jack Dunn from MIT. Development of OpenSolver is made easier by the excellent Excel Name Manager which displays all the hidden worksheet names used to store an optimization model.

OpenSolver is released as open source code under the GPL. This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. OpenSolver uses a range of solvers, information on these is available here.

Citing OpenSolver: Continued development of OpenSolver is only possible if we can demonstrate its impact. If you are publishing work that uses OpenSolver, please cite both this opensolver.org website and this paper:

Mason, A.J., “OpenSolver – An Open Source Add-in to Solve Linear and Integer Progammes in Excel”, Operations Research Proceedings 2011, eds. Klatte, Diethard, Lüthi, Hans-Jakob, Schmedders, Karl, Springer Berlin Heidelberg
pp 401-406, 2012, http://dx.doi.org/10.1007/978-3-642-29210-1_64, http://opensolver.org

Latex Reference

@INCOLLECTION{OpenSolver,
author = {Mason, AndrewJ},
title = {OpenSolver – An Open Source Add-in to Solve Linear and Integer Progammes
in Excel},
booktitle = {Operations Research Proceedings 2011},
publisher = {Springer Berlin Heidelberg},
year = {2012},
editor = {Klatte, Diethard and Lathi, Hans-Jakob and Schmedders, Karl},
series = {Operations Research Proceedings},
pages = {401-406},
note = {http://opensolver.org},
doi = {10.1007/978-3-642-29210-1_64},
isbn = {978-3-642-29209-5},
language = {English},
url = {http://dx.doi.org/10.1007/978-3-642-29210-1_64}
}

Footnote

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The Excel Solver is a product developed by Frontline Systems for Microsoft. OpenSolver has no affiliation with, nor is recommend by, Microsoft or Frontline Systems. All trademark terms are the property of their respective owners.

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