The　development　of　the　real-time　evaluation　for　the　catalytic　hydrogen　evolution　perfor-mance　under　a　simple　and　convinient　condiction　is　urgently　needed,　but　still　a　great　challenge.　Herein,　a　platinum　modulated　WOxon　Ag　nanowires　(Pt-WOx@Ag　NWs)　is　developed　as　an　optical-electrochemical　catalyst　to　realize　an　in-situ　intuitive　evaluation　for　the　hydrogen　evolution　performance,　in　which　the　color　of　as-prepared　Pt-WOx@Ag　NWs　catalyst　changes　from　the　transparent　to　the　deep　blue　with　the　increase　of　the　applied　potential.　The　real-time　H2　evolution　with　an　H2　turnover　frequency　(from　0　to　2.26　s-1　per　site),　optical　transmittance　(from　80.3%　to　48.7%　at　the　wavelength　of　630　nm)　and　energy　consumption　(from　0　to　0.74　W　h　in　1　h)　is　established.　The　charge　transfer　and　mass　transport　are　greatly　promoted　by　the　three　demensional　Ag　NWs　conductive　network　and　abundant　active　sites,　which　are　provided　by　the　platinum　modulated　WO3　on　the　Ag　substrate.　Density　functional　theory　(DFT)　calculations　indicate　that　the　modified　WOxshows　the　preferred　adsorption　affinity　toward　H2O　(DGH2O,-0.17　eV),　which　reach　a　high　coloration　efficiency　and　optical　modulation　range　for　the　electrochromic　reaction.　The　Pt　sites　on　WOxwith　a　suitable　H　binding　energy　(DGH*,　0.38　eV)　efficiently　promote　the　H*　conversion　and　H2　release　of　water　splitting.　This　work　propose　an　intelligent　hydrogen　evolution　indicator　by　real-time　color　change　to　boost　the　high-quality　development　of　green　hydrogen　energy.(c)　2022　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.