· 12 min read
Last-Modified Header and If-Modified-Since: 549 Sites Tested
We re-requested 549 top homepages: 86.7% honored If-Modified-Since, only 58.1% If-None-Match. How Last-Modified and ETag work, and which one Google uses.
Team Member
Oğuzhan Ulukaya
Software Developer
Oğuzhan Ulukaya is a software developer at SEOmator, which he joined in September 2026. He is a product-focused full-stack developer who works in TypeScript, with React and Next.js on the front end, and his recent work puts vector databases and AI features into production.
Oğuzhan has built B2B SaaS products since 2021. Based in İzmir, Türkiye, he has worked at Next Yazılım Teknoloji on Popupsmart since 2022, on the AI customer support tool LiveChatAI since 2023 and on QRCodeDynamic since 2026, after starting out as a frontend developer at Saypr. He holds a BSc in Computer Science from Dokuz Eylül University.
Articles by Oğuzhan Ulukaya
· 14 min read
CMS Checker: 9 Ways to Tell What CMS a Site Uses
Use a CMS checker or 9 manual checks to see what CMS a site runs. In our October 2026 test of 1,127 homepages, the generator tag named just 1 in 3.
· 11 min read
How to Check When a Website Was Last Updated
Two of the most-recommended ways to check a site's last-updated date are dead, and the rest disagree. Here's what still works, and how to cross-check it.
