Zefr is a brand suitability and contextual targeting platform for video advertising.
Categories: Ad verification
Official website: https://zefr.com
Zefr is ranked #20 of 20 in Ad verification by website adoption.
WhatStack detects Zefr by analyzing HTTP headers, HTML source code, JavaScript globals, meta tags, cookies, DNS records, and ads.txt entries using signature-based pattern matching across 10 different analyzers.