How we find and check new sites

Everything on a FirstSited page comes from what a website publishes to anyone who visits it: its pages, HTTP headers, DNS records, TLS certificate and standard files such as robots.txt. We report what we found. We do not grade sites.

Where the sites come from

Most sites we list we find ourselves, from publicly available internet infrastructure, usually within a day of going live. The rest come from launch platforms such as Product Hunt and Hacker News.

Parked domains, placeholder pages, spam networks and sites on large platforms are filtered out before anything reaches the catalogue.

Contact details

When we visit a site we look for the contact routes the business publishes itself: a contact page, and a general business inbox such as hello@, info@ or support@. We read them from the page we already render; we do not fill in forms, guess addresses or look anything up elsewhere.

Addresses that belong to a named person are never stored. Public pages show only whether a contact route exists; the details themselves go to subscribers in watches and exports.

Technology detection

We use our own detection engine: a catalogue of 67,207 technology fingerprints with 199,421 detection rules, built from what our crawler sees and growing every day. We render every page in a real browser with JavaScript running, so detection sees what a visitor sees, and a technology is reported only when its rules match.

The catalogue is not based on Wappalyzer or any third-party pattern list. Every rule comes from our own crawl data, is reviewed by a person and is tested against the live data before it goes in.

Catalogue growth
0 50,000 100,000 150,000 200,000 Apr 9: +355 fingerprints, +881 rules Apr 9: +355 fingerprints, +881 rules Apr 9: +355 fingerprints, +881 rules Apr 10: +858 fingerprints, +2551 rules Apr 10: +858 fingerprints, +2551 rules Apr 10: +858 fingerprints, +2551 rules Apr 11: +213 fingerprints, +520 rules Apr 11: +213 fingerprints, +520 rules Apr 11: +213 fingerprints, +520 rules Apr 12: +176 fingerprints, +410 rules Apr 12: +176 fingerprints, +410 rules Apr 12: +176 fingerprints, +410 rules Apr 13: +401 fingerprints, +694 rules Apr 13: +401 fingerprints, +694 rules Apr 13: +401 fingerprints, +694 rules Apr 14: +71 fingerprints, +194 rules Apr 14: +71 fingerprints, +194 rules Apr 14: +71 fingerprints, +194 rules Apr 15: +67 fingerprints, +137 rules Apr 15: +67 fingerprints, +137 rules Apr 15: +67 fingerprints, +137 rules Apr 16: +63 fingerprints, +146 rules Apr 16: +63 fingerprints, +146 rules Apr 16: +63 fingerprints, +146 rules Apr 17: +72 fingerprints, +154 rules Apr 17: +72 fingerprints, +154 rules Apr 17: +72 fingerprints, +154 rules Apr 18: +34 fingerprints, +76 rules Apr 18: +34 fingerprints, +76 rules Apr 18: +34 fingerprints, +76 rules Apr 19: +27 fingerprints, +79 rules Apr 19: +27 fingerprints, +79 rules Apr 19: +27 fingerprints, +79 rules Apr 20: +97 fingerprints, +251 rules Apr 20: +97 fingerprints, +251 rules Apr 20: +97 fingerprints, +251 rules Apr 21: +98 fingerprints, +266 rules Apr 21: +98 fingerprints, +266 rules Apr 21: +98 fingerprints, +266 rules Apr 22: +68 fingerprints, +300 rules Apr 22: +68 fingerprints, +300 rules Apr 22: +68 fingerprints, +300 rules Apr 23: +81 fingerprints, +238 rules Apr 23: +81 fingerprints, +238 rules Apr 23: +81 fingerprints, +238 rules Apr 24: +70 fingerprints, +253 rules Apr 24: +70 fingerprints, +253 rules Apr 24: +70 fingerprints, +253 rules Apr 25: +40 fingerprints, +101 rules Apr 25: +40 fingerprints, +101 rules Apr 25: +40 fingerprints, +101 rules Apr 26: +24 fingerprints, +192 rules Apr 26: +24 fingerprints, +192 rules Apr 26: +24 fingerprints, +192 rules Apr 27: +63 fingerprints, +164 rules Apr 27: +63 fingerprints, +164 rules Apr 27: +63 fingerprints, +164 rules Apr 28: +113 fingerprints, +243 rules Apr 28: +113 fingerprints, +243 rules Apr 28: +113 fingerprints, +243 rules Apr 29: +103 fingerprints, +720 rules Apr 29: +103 fingerprints, +720 rules Apr 29: +103 fingerprints, +720 rules Apr 30: +53 fingerprints, +159 rules Apr 30: +53 fingerprints, +159 rules Apr 30: +53 fingerprints, +159 rules May 1: +26 fingerprints, +38 rules May 1: +26 fingerprints, +38 rules May 1: +26 fingerprints, +38 rules May 2: +30 fingerprints, +47 rules May 2: +30 fingerprints, +47 rules May 2: +30 fingerprints, +47 rules May 3: +71 fingerprints, +175 rules May 3: +71 fingerprints, +175 rules May 3: +71 fingerprints, +175 rules May 4: +0 fingerprints, +7 rules May 4: +0 fingerprints, +7 rules May 4: +0 fingerprints, +7 rules May 5: +126 fingerprints, +253 rules May 5: +126 fingerprints, +253 rules May 5: +126 fingerprints, +253 rules May 6: +0 fingerprints, +0 rules May 6: +0 fingerprints, +0 rules May 6: +0 fingerprints, +0 rules May 7: +27 fingerprints, +67 rules May 7: +27 fingerprints, +67 rules May 7: +27 fingerprints, +67 rules May 8: +99 fingerprints, +247 rules May 8: +99 fingerprints, +247 rules May 8: +99 fingerprints, +247 rules May 9: +62 fingerprints, +178 rules May 9: +62 fingerprints, +178 rules May 9: +62 fingerprints, +178 rules May 10: +0 fingerprints, +0 rules May 10: +0 fingerprints, +0 rules May 10: +0 fingerprints, +0 rules May 11: +50 fingerprints, +125 rules May 11: +50 fingerprints, +125 rules May 11: +50 fingerprints, +125 rules May 12: +63 fingerprints, +171 rules May 12: +63 fingerprints, +171 rules May 12: +63 fingerprints, +171 rules May 13: +31 fingerprints, +89 rules May 13: +31 fingerprints, +89 rules May 13: +31 fingerprints, +89 rules May 14: +35 fingerprints, +106 rules May 14: +35 fingerprints, +106 rules May 14: +35 fingerprints, +106 rules May 15: +66 fingerprints, +125 rules May 15: +66 fingerprints, +125 rules May 15: +66 fingerprints, +125 rules May 16: +0 fingerprints, +0 rules May 16: +0 fingerprints, +0 rules May 16: +0 fingerprints, +0 rules May 17: +42 fingerprints, +103 rules May 17: +42 fingerprints, +103 rules May 17: +42 fingerprints, +103 rules May 18: +45 fingerprints, +119 rules May 18: +45 fingerprints, +119 rules May 18: +45 fingerprints, +119 rules May 19: +50 fingerprints, +112 rules May 19: +50 fingerprints, +112 rules May 19: +50 fingerprints, +112 rules May 20: +21 fingerprints, +31 rules May 20: +21 fingerprints, +31 rules May 20: +21 fingerprints, +31 rules May 21: +43 fingerprints, +115 rules May 21: +43 fingerprints, +115 rules May 21: +43 fingerprints, +115 rules May 22: +41 fingerprints, +74 rules May 22: +41 fingerprints, +74 rules May 22: +41 fingerprints, +74 rules May 23: +11 fingerprints, +29 rules May 23: +11 fingerprints, +29 rules May 23: +11 fingerprints, +29 rules May 24: +9 fingerprints, +25 rules May 24: +9 fingerprints, +25 rules May 24: +9 fingerprints, +25 rules May 25: +23 fingerprints, +47 rules May 25: +23 fingerprints, +47 rules May 25: +23 fingerprints, +47 rules May 26: +59 fingerprints, +157 rules May 26: +59 fingerprints, +157 rules May 26: +59 fingerprints, +157 rules May 27: +14 fingerprints, +58 rules May 27: +14 fingerprints, +58 rules May 27: +14 fingerprints, +58 rules May 28: +40 fingerprints, +97 rules May 28: +40 fingerprints, +97 rules May 28: +40 fingerprints, +97 rules May 29: +67 fingerprints, +159 rules May 29: +67 fingerprints, +159 rules May 29: +67 fingerprints, +159 rules May 30: +19 fingerprints, +37 rules May 30: +19 fingerprints, +37 rules May 30: +19 fingerprints, +37 rules May 31: +17 fingerprints, +41 rules May 31: +17 fingerprints, +41 rules May 31: +17 fingerprints, +41 rules Jun 1: +24 fingerprints, +52 rules Jun 1: +24 fingerprints, +52 rules Jun 1: +24 fingerprints, +52 rules Jun 2: +52 fingerprints, +109 rules Jun 2: +52 fingerprints, +109 rules Jun 2: +52 fingerprints, +109 rules Jun 3: +49 fingerprints, +112 rules Jun 3: +49 fingerprints, +112 rules Jun 3: +49 fingerprints, +112 rules Jun 4: +36 fingerprints, +64 rules Jun 4: +36 fingerprints, +64 rules Jun 4: +36 fingerprints, +64 rules Jun 5: +51 fingerprints, +150 rules Jun 5: +51 fingerprints, +150 rules Jun 5: +51 fingerprints, +150 rules Jun 6: +17 fingerprints, +29 rules Jun 6: +17 fingerprints, +29 rules Jun 6: +17 fingerprints, +29 rules Jun 7: +25 fingerprints, +53 rules Jun 7: +25 fingerprints, +53 rules Jun 7: +25 fingerprints, +53 rules Jun 8: +30 fingerprints, +55 rules Jun 8: +30 fingerprints, +55 rules Jun 8: +30 fingerprints, +55 rules Jun 9: +55 fingerprints, +166 rules Jun 9: +55 fingerprints, +166 rules Jun 9: +55 fingerprints, +166 rules Jun 10: +60 fingerprints, +104 rules Jun 10: +60 fingerprints, +104 rules Jun 10: +60 fingerprints, +104 rules Jun 11: +46 fingerprints, +107 rules Jun 11: +46 fingerprints, +107 rules Jun 11: +46 fingerprints, +107 rules Jun 12: +17 fingerprints, +38 rules Jun 12: +17 fingerprints, +38 rules Jun 12: +17 fingerprints, +38 rules Jun 13: +34 fingerprints, +73 rules Jun 13: +34 fingerprints, +73 rules Jun 13: +34 fingerprints, +73 rules Jun 14: +64 fingerprints, +93 rules Jun 14: +64 fingerprints, +93 rules Jun 14: +64 fingerprints, +93 rules Jun 15: +32 fingerprints, +75 rules Jun 15: +32 fingerprints, +75 rules Jun 15: +32 fingerprints, +75 rules Jun 16: +33 fingerprints, +45 rules Jun 16: +33 fingerprints, +45 rules Jun 16: +33 fingerprints, +45 rules Jun 17: +100 fingerprints, +175 rules Jun 17: +100 fingerprints, +175 rules Jun 17: +100 fingerprints, +175 rules Jun 18: +0 fingerprints, +0 rules Jun 18: +0 fingerprints, +0 rules Jun 18: +0 fingerprints, +0 rules Jun 19: +77 fingerprints, +183 rules Jun 19: +77 fingerprints, +183 rules Jun 19: +77 fingerprints, +183 rules Jun 20: +14 fingerprints, +29 rules Jun 20: +14 fingerprints, +29 rules Jun 20: +14 fingerprints, +29 rules Jun 21: +22 fingerprints, +45 rules Jun 21: +22 fingerprints, +45 rules Jun 21: +22 fingerprints, +45 rules Jun 22: +23 fingerprints, +91 rules Jun 22: +23 fingerprints, +91 rules Jun 22: +23 fingerprints, +91 rules Jun 23: +104 fingerprints, +532 rules Jun 23: +104 fingerprints, +532 rules Jun 23: +104 fingerprints, +532 rules Jun 24: +76 fingerprints, +207 rules Jun 24: +76 fingerprints, +207 rules Jun 24: +76 fingerprints, +207 rules Jun 25: +25 fingerprints, +86 rules Jun 25: +25 fingerprints, +86 rules Jun 25: +25 fingerprints, +86 rules Jun 26: +78 fingerprints, +206 rules Jun 26: +78 fingerprints, +206 rules Jun 26: +78 fingerprints, +206 rules Jun 27: +59 fingerprints, +134 rules Jun 27: +59 fingerprints, +134 rules Jun 27: +59 fingerprints, +134 rules Jun 28: +19 fingerprints, +61 rules Jun 28: +19 fingerprints, +61 rules Jun 28: +19 fingerprints, +61 rules Jun 29: +40 fingerprints, +100 rules Jun 29: +40 fingerprints, +100 rules Jun 29: +40 fingerprints, +100 rules Jun 30: +41 fingerprints, +148 rules Jun 30: +41 fingerprints, +148 rules Jun 30: +41 fingerprints, +148 rules Jul 1: +39 fingerprints, +160 rules Jul 1: +39 fingerprints, +160 rules Jul 1: +39 fingerprints, +160 rules Jul 2: +55 fingerprints, +220 rules Jul 2: +55 fingerprints, +220 rules Jul 2: +55 fingerprints, +220 rules Jul 3: +37 fingerprints, +95 rules Jul 3: +37 fingerprints, +95 rules Jul 3: +37 fingerprints, +95 rules Jul 4: +52 fingerprints, +188 rules Jul 4: +52 fingerprints, +188 rules Jul 4: +52 fingerprints, +188 rules Jul 5: +27 fingerprints, +82 rules Jul 5: +27 fingerprints, +82 rules Jul 5: +27 fingerprints, +82 rules Jul 6: +30 fingerprints, +114 rules Jul 6: +30 fingerprints, +114 rules Jul 6: +30 fingerprints, +114 rules Jul 7: +47 fingerprints, +175 rules Jul 7: +47 fingerprints, +175 rules Jul 7: +47 fingerprints, +175 rules Jul 8: +102 fingerprints, +298 rules Jul 8: +102 fingerprints, +298 rules Jul 8: +102 fingerprints, +298 rules Jul 9: +316 fingerprints, +649 rules Jul 9: +316 fingerprints, +649 rules Jul 9: +316 fingerprints, +649 rules Jul 10: +290 fingerprints, +675 rules Jul 10: +290 fingerprints, +675 rules Jul 10: +290 fingerprints, +675 rules Jul 11: +232 fingerprints, +579 rules Jul 11: +232 fingerprints, +579 rules Jul 11: +232 fingerprints, +579 rules Jul 12: +107 fingerprints, +201 rules Jul 12: +107 fingerprints, +201 rules Jul 12: +107 fingerprints, +201 rules Jul 13: +84 fingerprints, +201 rules Jul 13: +84 fingerprints, +201 rules Jul 13: +84 fingerprints, +201 rules Jul 14: +114 fingerprints, +196 rules Jul 14: +114 fingerprints, +196 rules Jul 14: +114 fingerprints, +196 rules Jul 15: +0 fingerprints, +0 rules Jul 15: +0 fingerprints, +0 rules Jul 15: +0 fingerprints, +0 rules Jul 16: +438 fingerprints, +1228 rules Jul 16: +438 fingerprints, +1228 rules Jul 16: +438 fingerprints, +1228 rules Jul 17: +413 fingerprints, +980 rules Jul 17: +413 fingerprints, +980 rules Jul 17: +413 fingerprints, +980 rules Jul 18: +176 fingerprints, +416 rules Jul 18: +176 fingerprints, +416 rules Jul 18: +176 fingerprints, +416 rules Jul 19: +360 fingerprints, +674 rules Jul 19: +360 fingerprints, +674 rules Jul 19: +360 fingerprints, +674 rules Jul 20: +41 fingerprints, +144 rules Jul 20: +41 fingerprints, +144 rules Jul 20: +41 fingerprints, +144 rules Jul 21: +146 fingerprints, +288 rules Jul 21: +146 fingerprints, +288 rules Jul 21: +146 fingerprints, +288 rules Jul 22: +461 fingerprints, +1487 rules Jul 22: +461 fingerprints, +1487 rules Jul 22: +461 fingerprints, +1487 rules Jul 23: +158 fingerprints, +454 rules Jul 23: +158 fingerprints, +454 rules Jul 23: +158 fingerprints, +454 rules Jul 24: +125 fingerprints, +325 rules Jul 24: +125 fingerprints, +325 rules Jul 24: +125 fingerprints, +325 rules Jul 25: +282 fingerprints, +819 rules Jul 25: +282 fingerprints, +819 rules Jul 25: +282 fingerprints, +819 rules Jul 26: +361 fingerprints, +684 rules Jul 26: +361 fingerprints, +684 rules Jul 26: +361 fingerprints, +684 rules Jul 27: +60 fingerprints, +193 rules Jul 27: +60 fingerprints, +193 rules Jul 27: +60 fingerprints, +193 rules Jul 28: +326 fingerprints, +984 rules Jul 28: +326 fingerprints, +984 rules Jul 28: +326 fingerprints, +984 rules Jul 29: +585 fingerprints, +1034 rules Jul 29: +585 fingerprints, +1034 rules Jul 29: +585 fingerprints, +1034 rules Jul 30: +1447 fingerprints, +3153 rules Jul 30: +1447 fingerprints, +3153 rules Jul 30: +1447 fingerprints, +3153 rules Jul 31: +2005 fingerprints, +4732 rules Jul 31: +2005 fingerprints, +4732 rules Jul 31: +2005 fingerprints, +4732 rules Aug 1: +592 fingerprints, +1335 rules Aug 1: +592 fingerprints, +1335 rules Aug 1: +592 fingerprints, +1335 rules Aug 2: +535 fingerprints, +1072 rules Aug 2: +535 fingerprints, +1072 rules Aug 2: +535 fingerprints, +1072 rules Aug 3: +1362 fingerprints, +2404 rules Aug 3: +1362 fingerprints, +2404 rules Aug 3: +1362 fingerprints, +2404 rules Aug 4: +1736 fingerprints, +4129 rules Aug 4: +1736 fingerprints, +4129 rules Aug 4: +1736 fingerprints, +4129 rules Aug 5: +971 fingerprints, +3404 rules Aug 5: +971 fingerprints, +3404 rules Aug 5: +971 fingerprints, +3404 rules Aug 6: +660 fingerprints, +2149 rules Aug 6: +660 fingerprints, +2149 rules Aug 6: +660 fingerprints, +2149 rules Aug 7: +659 fingerprints, +2304 rules Aug 7: +659 fingerprints, +2304 rules Aug 7: +659 fingerprints, +2304 rules Aug 8: +754 fingerprints, +2714 rules Aug 8: +754 fingerprints, +2714 rules Aug 8: +754 fingerprints, +2714 rules Aug 9: +810 fingerprints, +2686 rules Aug 9: +810 fingerprints, +2686 rules Aug 9: +810 fingerprints, +2686 rules Aug 10: +557 fingerprints, +1919 rules Aug 10: +557 fingerprints, +1919 rules Aug 10: +557 fingerprints, +1919 rules Aug 11: +560 fingerprints, +1745 rules Aug 11: +560 fingerprints, +1745 rules Aug 11: +560 fingerprints, +1745 rules Aug 12: +600 fingerprints, +2063 rules Aug 12: +600 fingerprints, +2063 rules Aug 12: +600 fingerprints, +2063 rules Aug 13: +882 fingerprints, +3000 rules Aug 13: +882 fingerprints, +3000 rules Aug 13: +882 fingerprints, +3000 rules Aug 14: +800 fingerprints, +2238 rules Aug 14: +800 fingerprints, +2238 rules Aug 14: +800 fingerprints, +2238 rules Aug 15: +856 fingerprints, +2811 rules Aug 15: +856 fingerprints, +2811 rules Aug 15: +856 fingerprints, +2811 rules Aug 16: +762 fingerprints, +2537 rules Aug 16: +762 fingerprints, +2537 rules Aug 16: +762 fingerprints, +2537 rules Aug 17: +584 fingerprints, +1897 rules Aug 17: +584 fingerprints, +1897 rules Aug 17: +584 fingerprints, +1897 rules Aug 18: +770 fingerprints, +2688 rules Aug 18: +770 fingerprints, +2688 rules Aug 18: +770 fingerprints, +2688 rules Aug 19: +720 fingerprints, +2738 rules Aug 19: +720 fingerprints, +2738 rules Aug 19: +720 fingerprints, +2738 rules Aug 20: +659 fingerprints, +2418 rules Aug 20: +659 fingerprints, +2418 rules Aug 20: +659 fingerprints, +2418 rules Aug 21: +1429 fingerprints, +3513 rules Aug 21: +1429 fingerprints, +3513 rules Aug 21: +1429 fingerprints, +3513 rules Aug 22: +1215 fingerprints, +4390 rules Aug 22: +1215 fingerprints, +4390 rules Aug 22: +1215 fingerprints, +4390 rules Aug 23: +1053 fingerprints, +3754 rules Aug 23: +1053 fingerprints, +3754 rules Aug 23: +1053 fingerprints, +3754 rules Aug 24: +919 fingerprints, +3073 rules Aug 24: +919 fingerprints, +3073 rules Aug 24: +919 fingerprints, +3073 rules Aug 25: +813 fingerprints, +2974 rules Aug 25: +813 fingerprints, +2974 rules Aug 25: +813 fingerprints, +2974 rules Aug 26: +1062 fingerprints, +3653 rules Aug 26: +1062 fingerprints, +3653 rules Aug 26: +1062 fingerprints, +3653 rules Aug 27: +530 fingerprints, +1930 rules Aug 27: +530 fingerprints, +1930 rules Aug 27: +530 fingerprints, +1930 rules Aug 28: +1257 fingerprints, +2479 rules Aug 28: +1257 fingerprints, +2479 rules Aug 28: +1257 fingerprints, +2479 rules Aug 29: +920 fingerprints, +2266 rules Aug 29: +920 fingerprints, +2266 rules Aug 29: +920 fingerprints, +2266 rules Aug 30: +837 fingerprints, +2036 rules Aug 30: +837 fingerprints, +2036 rules Aug 30: +837 fingerprints, +2036 rules Aug 31: +752 fingerprints, +1795 rules Aug 31: +752 fingerprints, +1795 rules Aug 31: +752 fingerprints, +1795 rules Sep 1: +895 fingerprints, +2199 rules Sep 1: +895 fingerprints, +2199 rules Sep 1: +895 fingerprints, +2199 rules Sep 2: +854 fingerprints, +2392 rules Sep 2: +854 fingerprints, +2392 rules Sep 2: +854 fingerprints, +2392 rules Sep 3: +799 fingerprints, +2091 rules Sep 3: +799 fingerprints, +2091 rules Sep 3: +799 fingerprints, +2091 rules Sep 4: +794 fingerprints, +1944 rules Sep 4: +794 fingerprints, +1944 rules Sep 4: +794 fingerprints, +1944 rules Sep 5: +900 fingerprints, +2067 rules Sep 5: +900 fingerprints, +2067 rules Sep 5: +900 fingerprints, +2067 rules Sep 6: +869 fingerprints, +2109 rules Sep 6: +869 fingerprints, +2109 rules Sep 6: +869 fingerprints, +2109 rules Sep 7: +583 fingerprints, +1909 rules Sep 7: +583 fingerprints, +1909 rules Sep 7: +583 fingerprints, +1909 rules Sep 8: +574 fingerprints, +1644 rules Sep 8: +574 fingerprints, +1644 rules Sep 8: +574 fingerprints, +1644 rules Sep 9: +635 fingerprints, +1764 rules Sep 9: +635 fingerprints, +1764 rules Sep 9: +635 fingerprints, +1764 rules Sep 10: +640 fingerprints, +1791 rules Sep 10: +640 fingerprints, +1791 rules Sep 10: +640 fingerprints, +1791 rules Sep 11: +595 fingerprints, +1704 rules Sep 11: +595 fingerprints, +1704 rules Sep 11: +595 fingerprints, +1704 rules Sep 12: +379 fingerprints, +1148 rules Sep 12: +379 fingerprints, +1148 rules Sep 12: +379 fingerprints, +1148 rules Sep 13: +370 fingerprints, +1030 rules Sep 13: +370 fingerprints, +1030 rules Sep 13: +370 fingerprints, +1030 rules Sep 14: +397 fingerprints, +1284 rules Sep 14: +397 fingerprints, +1284 rules Sep 14: +397 fingerprints, +1284 rules Sep 15: +445 fingerprints, +1227 rules Sep 15: +445 fingerprints, +1227 rules Sep 15: +445 fingerprints, +1227 rules Sep 16: +399 fingerprints, +1203 rules Sep 16: +399 fingerprints, +1203 rules Sep 16: +399 fingerprints, +1203 rules Sep 17: +380 fingerprints, +1098 rules Sep 17: +380 fingerprints, +1098 rules Sep 17: +380 fingerprints, +1098 rules Sep 18: +414 fingerprints, +1271 rules Sep 18: +414 fingerprints, +1271 rules Sep 18: +414 fingerprints, +1271 rules Sep 19: +348 fingerprints, +1016 rules Sep 19: +348 fingerprints, +1016 rules Sep 19: +348 fingerprints, +1016 rules Sep 20: +339 fingerprints, +910 rules Sep 20: +339 fingerprints, +910 rules Sep 20: +339 fingerprints, +910 rules Sep 21: +431 fingerprints, +1132 rules Sep 21: +431 fingerprints, +1132 rules Sep 21: +431 fingerprints, +1132 rules Sep 22: +378 fingerprints, +1094 rules Sep 22: +378 fingerprints, +1094 rules Sep 22: +378 fingerprints, +1094 rules Sep 23: +416 fingerprints, +1179 rules Sep 23: +416 fingerprints, +1179 rules Sep 23: +416 fingerprints, +1179 rules Sep 24: +352 fingerprints, +986 rules Sep 24: +352 fingerprints, +986 rules Sep 24: +352 fingerprints, +986 rules Sep 25: +380 fingerprints, +1141 rules Sep 25: +380 fingerprints, +1141 rules Sep 25: +380 fingerprints, +1141 rules Sep 26: +640 fingerprints, +1900 rules Sep 26: +640 fingerprints, +1900 rules Sep 26: +640 fingerprints, +1900 rules Sep 27: +464 fingerprints, +1251 rules Sep 27: +464 fingerprints, +1251 rules Sep 27: +464 fingerprints, +1251 rules Sep 28: +480 fingerprints, +1476 rules Sep 28: +480 fingerprints, +1476 rules Sep 28: +480 fingerprints, +1476 rules Sep 29: +761 fingerprints, +2660 rules Sep 29: +761 fingerprints, +2660 rules Sep 29: +761 fingerprints, +2660 rules Sep 30: +753 fingerprints, +2530 rules Sep 30: +753 fingerprints, +2530 rules Sep 30: +753 fingerprints, +2530 rules Oct 1: +776 fingerprints, +2627 rules Oct 1: +776 fingerprints, +2627 rules Oct 1: +776 fingerprints, +2627 rules Oct 2: +503 fingerprints, +1976 rules Oct 2: +503 fingerprints, +1976 rules Oct 2: +503 fingerprints, +1976 rules Oct 3: +410 fingerprints, +1593 rules Oct 3: +410 fingerprints, +1593 rules Oct 3: +410 fingerprints, +1593 rules Oct 4: +421 fingerprints, +1467 rules Oct 4: +421 fingerprints, +1467 rules Oct 4: +421 fingerprints, +1467 rules Oct 5: +479 fingerprints, +1658 rules Oct 5: +479 fingerprints, +1658 rules Oct 5: +479 fingerprints, +1658 rules Oct 6: +477 fingerprints, +1705 rules Oct 6: +477 fingerprints, +1705 rules Oct 6: +477 fingerprints, +1705 rules Oct 7: +477 fingerprints, +1450 rules Oct 7: +477 fingerprints, +1450 rules Oct 7: +477 fingerprints, +1450 rules Oct 8: +448 fingerprints, +1604 rules Oct 8: +448 fingerprints, +1604 rules Oct 8: +448 fingerprints, +1604 rules Oct 9: +538 fingerprints, +2157 rules Oct 9: +538 fingerprints, +2157 rules Oct 9: +538 fingerprints, +2157 rules Oct 10: +360 fingerprints, +1641 rules Oct 10: +360 fingerprints, +1641 rules Oct 10: +360 fingerprints, +1641 rules Oct 11: +678 fingerprints, +1835 rules Oct 11: +678 fingerprints, +1835 rules Oct 11: +678 fingerprints, +1835 rules Oct 12: +344 fingerprints, +1405 rules Oct 12: +344 fingerprints, +1405 rules Oct 12: +344 fingerprints, +1405 rules Oct 13: +357 fingerprints, +1754 rules Oct 13: +357 fingerprints, +1754 rules Oct 13: +357 fingerprints, +1754 rules Oct 14: +695 fingerprints, +2832 rules Oct 14: +695 fingerprints, +2832 rules Oct 14: +695 fingerprints, +2832 rules Oct 15: +618 fingerprints, +2099 rules Oct 15: +618 fingerprints, +2099 rules Oct 15: +618 fingerprints, +2099 rules Oct 16: +77 fingerprints, +442 rules Oct 16: +77 fingerprints, +442 rules Oct 16: +77 fingerprints, +442 rules Oct 17: +77 fingerprints, +325 rules Oct 17: +77 fingerprints, +325 rules Oct 17: +77 fingerprints, +325 rules Oct 18: +601 fingerprints, +1996 rules Oct 18: +601 fingerprints, +1996 rules Oct 18: +601 fingerprints, +1996 rules Oct 19: +320 fingerprints, +1481 rules Oct 19: +320 fingerprints, +1481 rules Oct 19: +320 fingerprints, +1481 rules Oct 20: +440 fingerprints, +1970 rules Oct 20: +440 fingerprints, +1970 rules Oct 20: +440 fingerprints, +1970 rules Oct 21: +278 fingerprints, +1829 rules Oct 21: +278 fingerprints, +1829 rules Oct 21: +278 fingerprints, +1829 rules Apr 9 Oct 21
Detection rules (199,421) Fingerprints (67,207)

Page basics

The things visitors, search engines and social platforms expect from a home page. For each one we show whether we found it:

  • A custom page title and meta description
  • Social sharing tags (Open Graph, Twitter cards)
  • A canonical URL
  • A responsive viewport
  • A favicon
  • Semantic HTML (nav, main, article)
  • No debug leftovers, such as localhost links or pages saved from a browser

Security headers

Which of six recommended security headers the site sends: Strict-Transport-Security, Content-Security-Policy, X-Content-Type-Options, X-Frame-Options, Referrer-Policy and Permissions-Policy. The old X-XSS-Protection header is shown but not counted, as browsers have dropped it in favour of Content-Security-Policy.

Some large platforms apply these protections at their own infrastructure rather than in headers we can see, so a missing header is not proof of a weakness.

Whether the site links a privacy policy and terms, and whether either still contains unfilled template text. We also note when analytics set tracking cookies on our visit with no consent manager in place: UK and EU GDPR require opt-in before tracking runs.

Performance

What one visit to the home page measured, each shown with a plain reading:

  • Largest Contentful Paint: time until the main content is visible. Under 2.5 seconds is good, over 4 is poor.
  • Page weight: total bytes transferred. Under 1 MB is light, over 3 MB is heavy.
  • Image weight: bytes spent on images. Under 500 KB is light, over 2 MB is heavy.
  • Cumulative Layout Shift: how much the layout jumps while loading. Under 0.1 is good, over 0.25 is poor.
  • Server response: how quickly the server answered. Under 500 ms is fast, over 1.5 seconds is slow.

One automated visit from one machine in Europe, so treat it as a quick check rather than a benchmark. It is not a Lighthouse run and not field data. Sites are measured again when their owner asks for a fresh snapshot.

Infrastructure

  • Hosting: the IP address the domain resolves to, mapped to its hosting provider and country.
  • TLS certificate: issuer, expiry date and how many names it covers.
  • Domain age: registration and expiry dates via RDAP, and the registrar where available.
  • Email setup: who handles the domain's email, and its SPF, DKIM and DMARC records.

Some domain endings (.io, .co, .me) do not publish RDAP data, so they show no domain age. Sites on a platform's subdomain (such as .vercel.app) show the platform's domain data.

AI crawlers

Whether the site welcomes or blocks AI crawlers, from its own declarations:

  • Welcomed: it publishes content for AI systems, for example an llms.txt file.
  • Blocked: its robots.txt blocks known AI crawlers.
  • Mixed: it does both.
  • No stance: it says nothing either way.

We also record a Content Signals line in robots.txt when a site has one, which states how it is happy for its content to be used for training, search and AI answers.

Looks AI-built

How strongly a site's code matches patterns we have seen across hundreds of sites built with AI tools from the same prompts. We show it as a plain band. It is a pattern match, not a verdict: using AI to build a site is a legitimate choice, and whether a particular site was built that way cannot be known from the outside.

Product category

A machine-learning classifier reads the site's description and suggests a category, such as developer tools, marketing or finance. Because it is a prediction rather than a fact, we show a category only when the model is confident, which is when it agrees with our human-reviewed labels about 98% of the time. Otherwise we show none.

Screenshots

When we take a full snapshot we capture the home page in a real browser at 1280 by 800, including content drawn by JavaScript.

If we found your site

  • Block our crawlers. FossickBot finds new sites and StackScopeBot checks them. Both identify themselves and obey robots.txt. Opt-out rules are on the bot page and at fossick.bot.
  • Claim it. Open its page and choose Own this site?. Verification takes a meta tag, a file or a DNS record, and needs no account. You can then ask for a fresh scan, or remove the site with one click.