XLfit review
A Windows Excel add-in for detailed curve fitting, modeling, and charting.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
XLfit is a Windows add-in for Microsoft Excel that combines curve fitting, statistical analysis, and charting for experimental data. It is aimed at scientific and technical work in pharmaceutical, chemical, engineering, and research settings, as well as teams that keep analysis in Excel. The feature set covers linear and nonlinear models, user-defined equations, 2D and 3D fitting, weighting, smoothing, error bars, diagnostics, and data-point rejection.
Two paid license options are listed. XLfit 5 Academic License costs $350 as a one-time purchase for academic use, while XLfit 5 Commercial License costs $900 as a one-time purchase for commercial use. There is no free plan. Because XLfit operates inside Microsoft Excel and exports editable charts to Microsoft Office applications, it fits organizations whose workflows already depend on Office files. Individual or batch migration of earlier XLfit workbooks can also help teams carrying forward existing analyses.
Its strongest case is depth in curve fitting: more than 70 built-in models, custom models, global fitting across multiple data sets, interactive chart editing, and automatic or interactive rejection of questionable points give analysts control over specialized modeling work. Support is provided through email and documentation, and deployment is desktop-based. XLfit is a sensible choice for Excel-centered researchers who need advanced fitting without moving to a separate analysis environment. Teams seeking a broader general-statistics platform, browser access, or a non-Windows deployment should consider alternatives instead.
XLfit pros and cons
- Where it wins
- More than 70 built-in linear and nonlinear curve models
- Supports custom, global, 2D, and 3D curve fitting
- Exports editable charts to Microsoft Office applications
- Where it doesn't
- Runs only on Windows desktops
- No free plan; licenses require one-time purchase
- More specialized for curve fitting than general statistical analysis
XLfit fact sheet, pricing and score →
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