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Class Co alternatives & similar sites

Class-co — 16 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Chemistry →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
whatschem.app ↗	60 match 1 shared topics	Plataforma WhatsChem? — Apoio ao Aprendizado de Química	pt	chemistry	robotsllmsaihumans	emailphone	none
mundiart.net ↗	60 match 1 shared topics	Mundiart Produtos Químicos	pt	chemistry	robotsllmsaihumans	email phone	none
enjoydyestuff.com ↗	60 match 1 shared topics	Fabricantes de corantes de enxofre na China, fornecedores de corantes solventes, fábrica de corantes básicos - APROVEITE	China~ pt	chemistry	robotsllmsaihumans	email phone	partial · 3
abbaquimica.com.br ↗	60 match 1 shared topics	Abba Quimica	Brazil pt	chemistry WordPress	robotsllmsaihumans	emailphone	none
abeq.org.br ↗	60 match 1 shared topics	Home - ABEQ	Brazil pt	chemistry WordPress	robotsllmsaihumans	emailphone	none
abiquim.org.br ↗	60 match 1 shared topics	Abiquim 2026 – Associação Brasileira da Indústria Química	Brazil pt	chemistry WordPress	robotsllmsaihumans	emailphone	none
abq-ap.org.br ↗	60 match 1 shared topics	Associação Brasileira de Química Regional Amapá	Brazil pt	chemistry WordPress WooCommerce	robotsllmsaihumans	emailphone	none
abqrs.com.br ↗	60 match 1 shared topics	ABQ – Rio Grande do Sul – Cursos Presenciais e EAD	Brazil pt	chemistry WordPress WooCommerce	robotsllmsaihumans	emailphone	none
deltacolorbrasil.com ↗	60 match 1 shared topics	Delta Color - Espectrofotômetros, colorímetros e softwares para o controle de qualidade de cores	pt	chemistry	robotsllmsaihumans	emailphone	none
gilquimica.com ↗	60 match 1 shared topics	Gil Química Representações	pt	chemistry	robotsllmsaihumans	emailphone	none
kmkquimica.com ↗	60 match 1 shared topics	KMK Química - Inovação e Tecnologia em Química Sustentável	pt	chemistry	robots llmsaihumans	emailphone	none
repbr.com ↗	60 match 1 shared topics	Rep Brasil – Soluções químicas	pt	chemistry WordPress	robotsllmsaihumans	email phone	none
alfamare.shop ↗	30 match 1 shared topics	Alfa Mare \| Qualidade para o seu laboratório - Loja Online	pt	chemistry	robotsllmsaihumans	email phone	none
abcristalografia.org.br ↗	30 match 1 shared topics	ABCr - Associação Brasileira de Cristalografia	Brazil pt	chemistry	robotsllmsaihumans	emailphone	none
abpol.org.br ↗	30 match 1 shared topics	ABPol – Associação Brasileira de Polímeros	Brazil pt	chemistry WordPress WooCommerce	robotsllmsaihumans	emailphone	none
myhexis.com ↗	30 match 1 shared topics	Hexis Científica	pt	science	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.