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Ratiometric fluorescence sensors are powerful tools for direct quantification of diverse biological analytes. To overcome a shortage of solvatochromic fluorophores crucial for in situ ratiometric imaging of biological targets, we prepared and characterized a small library of modular fluorophores with diverse spectral properties. Among them, WCB and WCR showed excellent spectral properties, including high photostability, brightness, and solvatochromism, and are ideally suited for dual ratiometric imaging due to their spectral orthogonality