Abstract <p>Dynamic oscillatory shear rheology (OSR) is a powerful technique for characterizing the viscoelastic behavior of complex fluids and soft materials. However, existing software tools for analyzing such data are limited in availability, accessibility, and scope. Moreover, most require nontrivial technical knowledge—such as software installation and programming skills—restricting their widespread use in research and industry. To address this gap, we developed OSR-Tool, a web-based application for the analysis of oscillatory shear data and extraction of meaningful material parameters. Accessible through modern web browsers at <a href="https://edufyx.com/OSR">https://edufyx.com/OSR</a> without the need for additional installations or specialized expertise, OSR-Tool integrates the most frequently used analysis methods—Fourier transform (FT) rheology, Lissajous curve analysis, stress decomposition (SD), Chebyshev parameters, and sequence of physical processes (SPP) techniques—within a unified interface. The tool enables efficient processing and interpretation of both linear and nonlinear oscillatory shear data and offers features, such as bulk file import, export capabilities, and an intuitive user interface. OSR-Tool is expected to significantly broaden the adoption of advanced oscillatory shear methods in the rheological characterization of complex fluids and soft materials.</p> Graphical abstract <p></p>