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Gamemasterslaboratory alternatives & similar sites

Game Master's Laboratory — 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 Roleplaying Games →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
mithos.app ↗	72 match 1 shared topics	MITHOS: Game Master's TTRPG Toolkit	en	roleplaying-games	robotsllmsaihumans	emailphone	none
gamemastersguild.org ↗	70 match 1 shared topics	The Game Masters Guild	en	roleplaying-games WordPress Shopify	robotsllmsaihumans	emailphone	none
narrwyn.com ↗	68 match 1 shared topics	Narrwyn — Free D&D Campaign Manager for Game Masters	en	roleplaying-games	robotsllmsaihumans	emailphone	none
d20master.org ↗	67 match 1 shared topics	d20Master	en	roleplaying-games	robots llmsaihumans	emailphone	none
airpghub.info ↗	67 match 1 shared topics	Home \| AIRPG \| AI RPG Game Master for Tabletop Roleplaying	en	roleplaying-games	robotsllmsaihumans	emailphone	none
airpghub.org ↗	67 match 1 shared topics	Home \| AIRPG \| AI RPG Game Master for Tabletop Roleplaying	en	roleplaying-games	robotsllmsaihumans	emailphone	none
narrantium.net ↗	67 match 1 shared topics	Narrantium — Narrative-First RPG Storytelling Platform for Game Masters	en	roleplaying-games	robots llmsaihumans	emailphone	none
mythmakerdemiplane.com ↗	67 match 1 shared topics	Spell Mastery Vault	en	roleplaying-games	robotsllmsaihumans	emailphone	none
startplayinggames.com ↗	67 match 1 shared topics	Play Tabletop Games and Find Game Masters \| StartPlaying	en	roleplaying-games	robotsllmsaihumans	emailphone	none
nerdgrinder.com ↗	67 match 1 shared topics	NerdGrinder - TTRPG Tools for Game Masters	en	roleplaying-games	robotsllmsaihumans	emailphone	none
fantasyguildhall.com ↗	66 match 1 shared topics	Games Master for Hire - Fantasy Guild Hall	en	roleplaying-games WordPress WooCommerce	robotsllmsaihumans	emailphone	none
fantasyfader.com ↗	66 match 1 shared topics	Fantasy Fader: Professional Audio Crossfading for Tabletop RPG Game Masters	en	roleplaying-games	robotsllmsaihumans	emailphone	none
gmc5e.com ↗	66 match 1 shared topics	GM Companion \| D&D 5e Tool \| Game Master Companion 5e	en	roleplaying-games Wix	robots llmsaihumans	emailphone	none
mythicprintmasters.com ↗	65 match 1 shared topics	Mythic Print Masters \| Mythic Print Masters	United States~ en	roleplaying-games Weebly Square Online	robotsllmsaihumans	emailphone	none
friendlydungeonmaster.com ↗	65 match 1 shared topics	Friendly Dungeonmaster	en	roleplaying-games	robotsllmsaihumans	emailphone	none
stage-worldsmith.com ↗	65 match 1 shared topics	Homebrew Generators	en	roleplaying-games	robots llmsaihumans	emailphone	none
mister-monster.com ↗	65 match 1 shared topics	Mister Monster's Workshop	en	roleplaying-games WordPress	robotsllmsaihumans	emailphone	none
spymaster.org ↗	65 match 1 shared topics	Spymaster -- HOME OFFICE	en	roleplaying-games	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.