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Blackwell Grading - Professional Card Grading Services — 18 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 Collecting →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
cardproof.io ↗	67 match 1 shared topics	CardProof™ - Proof of Possession for Collectibles	en	collecting	robotsllmsaihumans	emailphone	none
spellcollector.com ↗	67 match 1 shared topics	Spell Collector - Trading Card Marketplace & Collection Manager	en	collecting	robotsllmsaihumans	emailphone	none
4diamondcardgrading.com ↗	67 match 1 shared topics	Four Diamond Card Grading	en	collecting Webflow	robotsllmsaihumans	emailphone	none
cardkings.com ↗	67 match 1 shared topics	CardKings - Trading Cards & Collectibles	en	collecting	robotsllmsaihumans	emailphone	none
ctrlcards.com ↗	67 match 1 shared topics	CTRL BREAKS - The ultimate website for breaks, trading cards and boxes – CTRL CARDS	en	collecting Shopify	robots llmsaihumans	emailphone	none
cardvaluepro.com ↗	66 match 1 shared topics	Card Value Pro: #1 Card Value Scanner for Trading Cards	en	collecting	robotsllmsaihumans	emailphone	none
4sharpcorners.com ↗	66 match 1 shared topics	Consign, buy and sell your trading card collection with 4 Sharp Corners	en	collecting BigCommerce	robotsllmsaihumans	emailphone	none
4sharpcornersconsignment.com ↗	66 match 1 shared topics	Consign, buy and sell your trading card collection with 4 Sharp Corners	en	collecting BigCommerce	robotsllmsaihumans	emailphone	none
cgccomics.com ↗	66 match 1 shared topics	Pop Culture Collectibles Grading \| Certified Guaranty \| CGC	en	collecting	robotsllmsaihumans	emailphone	none
ctrlcollectibles.com ↗	66 match 1 shared topics	Ctrl Collectibles \| Singapore-based Trading Card Marketplace, Auctions & Vault Storage	Singapore~ en	collecting	robotsllmsaihumans	emailphone	none
3ctradingco.com ↗	66 match 1 shared topics	3C Trading Co	en	collecting	robotsllmsaihumans	emailphone	none
cardtraderpete.com ↗	66 match 1 shared topics	Card Trader Pete \| Trading & Selling Rare Cigarette and Tobacco Cards	en	collecting	robotsllmsaihumans	emailphone	none
cardhawkuk.com ↗	66 match 1 shared topics	CardHawkUK \| Vintage Cigarette & Trade Cards \| PSA Grading	en	collecting WordPress WooCommerce	robotsllmsaihumans	emailphone	none
lazybearmarket.com ↗	66 match 1 shared topics	Lazy Bear Game Company — Trading Cards & Designer Figures	en	collecting Shopify	robotsllmsaihumans	emailphone	none
spectrumsportscollectibles.com ↗	65 match 1 shared topics	Spectrum - Trading cards, memorabilia, and the culture of collecting.	en	collecting	robots llmsaihumans	emailphone	none
card-hawk.com ↗	65 match 1 shared topics	CardHawk - Find the Best Trading Card Deals \| Price Comparison & Alerts	en	collecting	robotsllmsaihumans	emailphone	none
cardalbums.com ↗	65 match 1 shared topics	CardAlbums.com — Card Albums, Trading Card Storage, Collecting Supplies, Displays & Hobby News	en	collecting	robotsllmsaihumans	emailphone	none
cardnroll.com ↗	65 match 1 shared topics	Card 'n' Roll	en	collecting	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.