Biogenic　amines　(BAs)　are　crucial　markers　of　meat　spoilage.　Developing　practical　and　effective　BAs　detection　methods　is　essential　for　monitoring　meat　freshness　and　ensuring　daily　consumption　safety.　This　study　prepared　several　naphthalene-based　fluorescent　compounds　to　visually　monitor　meat　freshness　in　real-time.　These　probes　show　a　colorimetric　fluorescence　response　to　putrescine　and　cadaverine　(typical　spoilage　indicators)　through　nucleophilic　addition/elimination　reaction.　The　detectability　of　these　probes　can　be　optimized　by　altering　the　electronegativity　and　substitution　position　of　the　recognition　group.　Among　these　compounds,　2-((6-(4-(diphenylamino)phenyl)naphthalen-2-yl)methylene)malono　nitrile　(TNMA)　demonstrated　exceptional　sensing　performance　toward　putrescine　and　cadaverine,　including　high-contrast　fluorescence　color　transition　(red　to　blue),　rapid　response　times　(similar　to　30　s),　high　selectivity　and　sensitivity　(detection　limit　for　putrescine:　2.69　ppm,　cadaverine:　6.11　ppm).　Furthermore,　the　B/R　values　of　TNMA　test　strips　output　by　RGB　analysis　presented　a　linear　correlation　with　total　volatile　basic　nitrogen　(TVBN,　an　international　standard　for　evaluating　food　spoilage)　values　in　pork.　Based　on　this　correlation,　we　utilized　smartphone　applications　to　construct　an　intelligent　evaluation　system,　enabling　visual　monitoring　of　pork,　chicken,　and　shrimp　freshness　under　various　storage　conditions.　The　TNMA-based　system　offers　a　reliable　platform　for　real-time,　portable　and　visual　monitoring　of　meat　freshness　for　consumers　and　suppliers　in　the　food　industry.