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A novel dual-response fluorescence probe (<b>XBT-CN</b>) was developed by using a fluorescence priming strategy for quantitative monitoring and visualization of hydrazine (N₂H₄) and hypochlorite (ClO⁻). With the addition of N₂H₄/ClO⁻, the cleavage reaction of C=C bond initiated by N₂H₄/ClO⁻ was transformed into corresponding hydrazone and aldehyde derivatives, inducing the probe <b>XBT-CN</b> appeared a fluorescence “off-on” response, which was verified by DFT calculation. HRMS spectra were also conducted to confirm the sensitive mechanism of <b>XBT-CN</b> to N₂H₄ and ClO⁻. The probe <b>XBT-CN</b> had an obvious fluorescence response to N₂H₄ and ClO⁻, which caused a significant color change in unprotected eyes. In addition, the detection limits of <b>XBT-CN</b> for N₂H₄ and ClO⁻ were 27 nM and 34 nM, respectively. Interference tests showed that other competitive analytes could hardly interfere with the detection of N₂H₄ and ClO⁻ in a complex environment. In order to realize the point-of-care detection of N₂H₄ and ClO⁻, an <b>XBT-CN</b>@hydrogel test kit combined with a portable smartphone was developed. Furthermore, the portable test kit has been applied to the detection of N₂H₄ and ClO⁻ in a real-world environment and food samples, and a series of good results have been achieved. Attractively, we demonstrated that <b>XBT-CN</b>@hydrogel was successfully applied as an encryption ink in the field of information security. Finally, the probe can also be used to monitor and distinguish N₂H₄ and ClO⁻ in living cells, exhibiting excellent biocompatibility and low cytotoxicity.