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Challenge23 alternatives & similar sites

Challenge 23 — 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 Brain And Nervous System Disorders →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
mdateammomentum.org ↗	61 match 1 shared topics	Register for a Race of Your Choice \| Muscular Dystrophy Association	en	brain-and-nervous-system-disorders Drupal	robotsllmsaihumans	emailphone	none
mdateam.org ↗	61 match 1 shared topics	Register for a Race of Your Choice \| Muscular Dystrophy Association	en	brain-and-nervous-system-disorders Drupal	robotsllmsai humans	emailphone	none
cscfsupport.org ↗	61 match 1 shared topics	CSCF Support \| Cardiospondylocarpofacial Syndrome Community & Resources	en	brain-and-nervous-system-disorders	robotsllmsaihumans	emailphone	none
blackgirltransversemyletisworld.com ↗	60 match 1 shared topics	Black Girl Living In a Transverse Myletis World – Day in the life of living with a rare auto immune disease.	en	brain-and-nervous-system-disorders WordPress	robotsllmsaihumans	emailphone	none
blessings-of-alz.blog ↗	60 match 1 shared topics	Blessings of Alzheimer's – my proactive journey with ALZ	en	brain-and-nervous-system-disorders WordPress	robotsllmsaihumans	emailphone	none
bmas.blog ↗	60 match 1 shared topics	The BMAS Blog – This is the blog of the British Medical Acupuncture Society	en	brain-and-nervous-system-disorders WordPress	robotsllmsaihumans	emailphone	none
bodyscience.life ↗	60 match 1 shared topics	BodyScience \| functional medical clinic - neurodegenerative diseases \| Body Science \| ALS	en	brain-and-nervous-system-disorders Wix	robots llmsaihumans	emailphone	none
bosterms.center ↗	60 match 1 shared topics	MS Center \| The Boster Center for Multiple Sclerosis	en	brain-and-nervous-system-disorders WordPress	robotsllmsaihumans	email phone	partial · 8
botox-facts.info ↗	60 match 1 shared topics	BOTOX® (onabotulinumtoxinA) Injections for Spasticity	en	brain-and-nervous-system-disorders Adobe Experience Manager	robotsllmsaihumans	emailphone	none
boulevardedreaming.blog ↗	60 match 1 shared topics	Boulevarde Dreaming – The year my brain broke	en	brain-and-nervous-system-disorders WordPress	robotsllmsaihumans	emailphone	none
braincheck.website ↗	60 match 1 shared topics	Discover Your Type \| Quiz	en	brain-and-nervous-system-disorders	robotsllmsaihumans	emailphone	none
brainpreserve.life ↗	60 match 1 shared topics	Cognitive Decline Prevention Program	en	brain-and-nervous-system-disorders WordPress	robotsllmsaihumans	emailphone	none
brainmd.nyc ↗	60 match 1 shared topics	Preventive Neurologist \| Alzheimer's Prevention \| Dr. Nadir Bilici, MD	en	brain-and-nervous-system-disorders WordPress	robotsllmsaihumans	emailphone	none
brainquiz.study ↗	60 match 1 shared topics	脳 — Brain Atlas	en	brain-and-nervous-system-disorders	robots llmsaihumans	emailphone	none
brainresearchcanada.info ↗	60 match 1 shared topics	Brain Canada Foundation – Advancing Bold Brain Research	en	brain-and-nervous-system-disorders	robotsllmsaihumans	emailphone	none
braininjuryforum.blog ↗	60 match 1 shared topics	Living with Brain Injury	en	brain-and-nervous-system-disorders WordPress	robotsllmsaihumans	emailphone	none
braininjurycoalition.info ↗	60 match 1 shared topics	Brain Injury Coalition	United States~ en	brain-and-nervous-system-disorders	robotsllmsaihumans	emailphone	none
brainhealthleadershipfoundation.org ↗	60 match 1 shared topics	Brain Health Leadership Foundation	en	brain-and-nervous-system-disorders Squarespace Magento	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.