History： 1：1stOpt 8.0 released on Aug., 25, 2018, details.... 1stOpt 7.0 released on April 20, 2016, details... 2：1stOpt 6.0 released on Jan. 10, 2014, details... 3：1stOpt 5.0 released on Feb. 3, 2012, details... 4：1stOpt 4.0 released on Aug. 6, 2010, details... 5：1stOpt3.0 released on May 8, 2009，details... 6：1stOpt2.5 released on Nov. 1, 2007: details... 7：1stOpt2.0 released on Oct. 7, 2006: details...。 7D-Soft High Technology Inc. 1stOpt - First Optimization 7D Software 1stOpt - First Optimization Tel.：13269987748； WdeChart：software_7d_1stopt 1stOpt 9.0 released on Oct., 18, 2020，see what’s new here: 9.0 New。 QQ:  454715413； E-Mail: info@7d-soft.com State of the Art Optimization Software for Advance Numerical Computation Have you experienced with struggling to guess and guess the initial start values of the parameters on your optimization/regression models? Do you want to an optimization analysis tool with the features of easy-to-use, lightweght and powerful? 1stOpt is answer! 1stOpt (the former name is Auto2Fit) is a robust, flexible and state-of-the-art optimization package.  The unique optimization algorithm of UGO (Universal Global Optimization) makes the 1stOpt the best and the most efficient and effiective  tool in the area of nonlinear regression worldwide today. 1stOpt is also easier, faster and powerful for solving linear, nonlinear and integer, mixed integer optimization modes, both constrained and unconstrained. The world No. 1 software package for nonlinear regression, curve fit, system equation solving, global optimization for various problems! 1stOpt can be used  in the fields below: • Nonlinear  regression: linear, nonlinear, ODE regression, regression with complex function and data, multi-nonlinear  with no limitations on variable and parameter  number, no need to guess initial start values • Global  optimization:  find the maximal/minimal value of any function or model. The function or model may be nonlinear, non continues, non derivable, with constrained conditions. • Equation  Solve: solve any type of equation or system  equations • ODE Equation  Solve: both initial value problem solve any type of equation or system  equations • Model  Auto-calibration: parameter estimation of any  complicated  engineer model • Plot  2-D, 3-D cartesian and 2-D parametric function  chart, especial for implicit functions • and  much more...