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With the LINDO API, you can easily create your own optimization applications. It allows you to plug the power of the LINDO solvers right into customized applications and mathematical programs that you have written. The recently released LINDO API 14.0 includes a number of significant enhancements and new features.



                                         Base Nonlinear                       Global
                                 Linear Models Nonlinear



NL Variables

Global Solver

NL Variables

Capacity Constraints Variables Integers
Commercial/Super 1,000 2,000 200 200 200 10
Professional/Hyper 4,000 8,000 800 800 800 20
Industrial 16,000 32,000 3,200 3,200 3,200 50
Extended Unrestricted Unrestricted Unrestricted Unrestricted Unrestricted Unrestricted


The LINDO API makes it easy for you to seamlessly integrate optimization into your own application. The developer interface has been designed for maximum ease-of-use and flexibility. It comes with clear, comprehensive documentation and examples to help you get running quickly.


LINDO API provides you with an arsenal of powerful solvers for Stochastic, Linear, Nonlinear (convex & nonconvex/Global), Quadratic, Quadratically Constrained, Second Order Cone and Integer optimization. All solvers incorporate numerous enhancements for maximum speed and robustness, … more


LINDO Systems has begun shipping a new release of LINDO API that includes new features to allow users to incorporate uncertainty into their optimization models, … more


Whether your application is big or small, simple or complex, the LINDO API provides the flexibility and functionality that you’ll need. It includes dozens of routines to formulate, solve, query, and modify your problems, … more


The Windows 32 bit and 64 bit versions of LINDO API can be run as a MATLAB callable function. Using MATLAB ‘s modeling and programming environment, you can build and solve models and create custom algorithms based upon the LINDO API’s routines and solvers, … more


LINDO API provides all of the tools you will need to get up and running quickly. You get the LINDO API User Manual (in printed form and available online in pdf format) that includes detailed function definitions for all routines. Also included in the manual is a discussion to assist you in writing your own applications, … more


LINDO API includes tools that allow you to track down what has caused a model to be infeasible or unbounded. The tools isolate a portion of the original model as the source of the problem. This allows you to focus your attention on a relatively small subsection of the model to look for formulation or data entry errors. On infeasible linear, nonlinear, quadratic and integer models, the tools can find an irreducibly inconsistent set of constraints (IIS), and on unbounded models, the tools can find an irreducibly unbounded set of columns (IUS).


The LINDO API is thread safe to allow you to create web and network applications that handle multiple user sessions concurrently. Web and network applications require special licensing. Contact LINDO Systems for more information.


Why pay for more capacity than you need? The LINDO API is available in a variety of different capacities. The capacities range from a few hundred variables to versions with unlimited capacity, so you can select the product that best suits your needs for a particular problem.

Linear-Integer solver:

Improved heuristics for general integer programs.


Average performance improvement of 2-3% on our standard test set.


Improved method for generating all alternative optima to a linear program.


The first call to LSgetNextBestSol() creates a prespecified number of corner points via pivoting on the optimal solution set. Subsequent calls will nonredundantly return successive corner points. Standard solution query methods can be used to access primal-dual vectors following each call to LSgetNextBestSol.



Support for Indicator constraints, e.g., z = 0 implies x + y <= 0;


more expressions can be automatically linearized, so you can now use a fast linear solver where otherwise a much slower (30x?) nonlinear solver.might be required.


advanced linearization of QP and Conic models


improved linearization of certain IF expressions.

Nonlinear and Global solver:

faster (order of magnitude) solution of linear fractional programs (ratio objectives).


improved bound tightening process in preprocessing of nonlinear models.


auxiliary variables generated automatically to improve performance with complicated expressions.


Support for additional useful but “problematic” functions:

Power utility function  (x^g-1)/g  and the exponential ratio function (exp(g) – 1)/g, are important in some situations modeling consumer behavior. LINDO API can now robustly avoid the numerical problems that would otherwise occur when g approaches 0.



Julia/JuMP is now supported officially.


Python interface installations now easier via pip (pypi.org)


Matlab interface now has two alternative methods for linear and integer optimization, LSlinprog and LSintprog. Argument lists follow their counterparts, linprog and intprog, in Matlab’s optimization toolbox.


Per consultare i termini e le condizioni d’uso della casa produttrice del Software, LINDO Systems, cliccare qui


LINDO API End User License Agreement

IMPORTANT – Carefully read all the terms and conditions of this agreement before installing this software package. Installing this package indicates your acceptance of these terms and conditions. If you do not accept these terms and conditions, please contact LINDO Systems Inc., 1415 N. Dayton St., Chicago, IL, 60642, for instructions on return of this package for a refund.


LINDO Systems License Agreement

Subject to the following terms and conditions, LINDO Systems Inc. (LINDO) hereby grants to you a non-exclusive license to use the LINDO Systems Inc. software program (the “SOFTWARE”) contained on the enclosed media and related documentation.


Software Licence

Except as set forth below, LINDO grants to you the right to use the SOFTWARE on any single computer. You may also install a copy for your exclusive use on either a home computer or portable computer. You may store or install a copy of the SOFTWARE on a storage device, such as a network server, used only to install or run the SOFTWARE over an internal network; however, you must acquire and dedicate a license for each individual who will use the SOFTWARE. If the license is installed on a network server or other system that physically allows shared access to the SOFTWARE, you agree to provide technical or procedural methods to prevent use of the SOFTWARE by individuals not specifically licensed to use the SOFTWARE pursuant to this Agreement.



The SOFTWARE may be transferred to a single recipient on a permanent basis provided you retain no copies of the SOFTWARE nor documentation (including backup or archival copies) and the recipient agrees to the terms and conditions of this license agreement. At the time of the transfer of the SOFTWARE, you must transfer all media and documentation including any updated media and documentation.



The SOFTWARE and its related documentation are copyrighted and protected by US copyright laws and international treaty provisions. You may not use, copy, modify, or transfer the SOFTWARE or related documentation except as expressly provided in the license agreement or with written permission of LINDO Systems Inc.


Restrictions Against Distribution

You may not distribute, lease, sublease, rent, or sublicense the SOFTWARE or related documentation without written permission of LINDO Systems, Inc.


Limited Warranty

LINDO Systems Inc. warrants that the enclosed media and the copy of the related documentation to be free of defects in materials and workmanship for a period of one year from receipt of your payment. Due to the inherent complexity of computer programs and mathematical models, the SOFTWARE and your mathematical models may not be completely free of errors. You are advised to verify your answers before basing decisions on them. NEITHER LINDO SYSTEMS INC. NOR ANYONE ASSOCIATED WITH THE CREATION, PRODUCTION, OR DISTRIBUTION OF THE SOFTWARE MAKES ANY OTHER EXPRESSED WARRANTIES REGARDING THE MEDIA OR DOCUMENTATION AND MAKES NO WARRANTIES AT ALL, EITHER EXPRESSED OR IMPLIED, REGARDING THE SOFTWARE, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE.



LINDO’s entire liability and your exclusive remedy for breach of this Limited Warrant shall be, at LINDO’s Option, either return of the price paid or replacement of defective media or documentation. In no event shall LINDO Systems Inc. be liable for any damages including but not limited to loss of profit, data, or direct, indirect, special or consequential damages, even if LINDO has been specifically advised of the possibility of such damages.



This agreement gives you specific rights, and you may also have other rights that vary from state to state. This License Agreement is governed by, and shall be construed in accordance with, the laws of the State of Illinois.


Third Party Software

For components that reference the GNU General Public License (GPL) or the GNU Lesser General Public License (LGPL), please find these licenses and the written offer for source code in ‘Written Offer for GPL and LGPL Source Code’ document. This document is located either on the installation path or under the ‘doc’ subfolder.

Rev. 13 Ottobre 2022

LINDO API is a Callable library, with which, you can easily create your own optimization applications. It allows you to plug the power of the LINDO solver right into customized applications that you have written.


Lindo API
Processor File Size
14.0 Windows 32 x86 23.1 MB
14.0 Windows 64 x64 26.3 MB
14.0 (Manual installation) Windows 32 x86 23.1 MB
14.0 (Manual installation) Windows 64 x64 26.3 MB
14.0 Linux 64 x64 25.4 MB
14.0 Mac 64 x64 19.7 MB

Note: a 32 bit version of the software will run on a 64 bit processor.


Beta Release:


Lindo API
Processor File Size
11.0 Linux 32 ARM32 25.4 MB
11.0 Android 55 MB
11.0 (Simple Android application) Android 55 MB


Lindo API User Manual

The Lindo API user manual can be downloaded in pdf format here


Download Models for LINDO API

With the LINDO API, you can easily create your own optimization applications. It allows you to plug the power of the LINDO solver right into customized applications that you have written.



Operations Research: Applications and Algorithms by Wayne L. Winston.



Get a quick overview of the optimization modeling tools offered by LINDO Systems. The video goes over the arsenal of solvers and unique capabilities of LINGO, What’sBest, and LINDO API.

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