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An Open-source File Format API Guide For Developers — 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 Technology And Computing →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
ballotapi.org ↗	68 match 1 shared topics	BallotAPI - Ballots for developers	en	technology-and-computing	robotsllmsaihumans	emailphone	none
datapilotapi.com ↗	67 match 1 shared topics	Craigslist Data API for Developers \| DataPilotAPI	en	technology-and-computing	robotsllmsaihumans	emailphone	none
dashfordevs.com ↗	67 match 1 shared topics	Dash4Devs - Dashboard Platform for Developers	en	technology-and-computing	robotsllmsaihumans	emailphone	partial · 8
stack-notes.com ↗	67 match 1 shared topics	Stack Notes — Error Codes Reference for Developers	en	technology-and-computing	robots llmsaihumans	emailphone	partial · 8
9dev.tech ↗	67 match 1 shared topics	9 Developers	en	technology-and-computing	robotsllmsaihumans	emailphone	partial · 8
9developers.tech ↗	67 match 1 shared topics	9 Developers	en	technology-and-computing	robotsllmsaihumans	emailphone	partial · 8
ssoready.com ↗	67 match 1 shared topics	SSOReady \| Open source developer tools for SAML single sign-on	en	technology-and-computing	robotsllmsaihumans	emailphone	none
omnimark.com ↗	67 match 1 shared topics	OmniMark Developer Resources	en	technology-and-computing	robotsllmsaihumans	emailphone	none
24hit.net ↗	67 match 1 shared topics	24Hit - Real-time Hit Tracking for Developers	en	technology-and-computing	robotsllmsaihumans	emailphone	none
1xapi.com ↗	67 match 1 shared topics	1xAPI — API Marketplace for Developers \| Fast, Reliable, Affordable APIs	en	technology-and-computing	robotsllmsaihumans	emailphone	partial · 8
datapeak.net ↗	66 match 1 shared topics	Developers	en	technology-and-computing	robotsllmsaihumans	emailphone	none
devbloggers.net ↗	66 match 1 shared topics	Developer Bloggers - By developers, for developers	en	technology-and-computing	robotsllmsaihumans	emailphone	none
heliosgcs.com ↗	66 match 1 shared topics	Helios GCS - Open-Source Ground Control Station for Drones	en	technology-and-computing	robots llmsaihumans	emailphone	none
reporanker.com ↗	66 match 1 shared topics	RepoRanker: real reviews for your open-source repo	en	technology-and-computing Aimeos	robotsllmsaihumans	emailphone	none
developersguild.org ↗	66 match 1 shared topics	Enterprise Developers Guild	en	technology-and-computing WordPress	robotsllmsaihumans	emailphone	none
developers-guide.net ↗	66 match 1 shared topics	30 Facts about Developer's Guide - Facts.net	en	technology-and-computing WordPress	robotsllmsaihumans	emailphone	none
stackbrieftech.com ↗	66 match 1 shared topics	TechStackBrief - Daily Tech Insights for Developers	en	technology-and-computing WordPress WooCommerce	robotsllmsaihumans	emailphone	none
1percent.dev ↗	66 match 1 shared topics	1% Developer	en	technology-and-computing	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.