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A simple coumarin based hydrazone has been synthesized. The chemosensor displayed high selectivity toward F– ions with fast response and high sensitivity. The chemosensor was useful for analytical applications. [Display omitted] • The coumarin based hydrazone as colorimetric chemosensors for efficient sensing of F– ion. • The proposed sensing mechanism of WJ-F toward F– ion was confirmed by 1H NMR and DFT calculation. • The reversibility of WJ-F toward F– and MeOH was applied for the construction of a combinatorial logic gate circuit. • The WJ-F was applied in detecting F– ion in the test strips and toothpaste sample. Chemosensors are molecular devices which react with target and give a visible signal, which is a degree of its sensitivity. Herein, a novel coumarin based Schiff Base has been synthesized for F– ions detection. The chemosensor showed an intense color change upon the addition of F– ions (light yellow to purple). The chemosensor has fewer effects of competing anions. The limit of detection is calculated as low as 1.1 × 10–6 and the binding constant was determined as 1.61 × 104. The job's plot confirmed 1:1 stoichiometry between chemosensor and F– ion. The reverse reaction of chemosensor with MeOH is useful to construct a combinatorial logic circuit gates. The interaction mechanism of chemosensor was deliberated by 1H NMR, FTIR, and DFT studies. Finally, the chemosensor was useful to detect F– ions in tooth-paste sample and test strip is prepared for F– ions detection. [ABSTRACT FROM AUTHOR]