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Best books online library — 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 Programming Languages →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
cxxfilt.com ↗	66 match 2 shared topics	Demangler Online	en	programming-languages	robotsllmsaihumans	emailphone	none
codecogs.com ↗	65 match 2 shared topics	CodeCogs \| Open Source Scientific Library (C/C++, .NET, Excel)	en	programming-languages	robotsllmsaihumans	emailphone	none
onlinejsonformat.com ↗	64 match 2 shared topics	Online Json Formatter, String Formatter	en	technology-and-computing	robotsllmsaihumans	emailphone	none
base64.dev ↗	64 match 2 shared topics	Base64 Encode & Decode Online — base64.dev	en	technology-and-computing	robots llmsaihumans	emailphone	partial · 9
onlinejsonparser.com ↗	64 match 2 shared topics	JSON Parser Online – Free JSON Formatter, Validator & Tree Viewer	en	technology-and-computing	robotsllmsaihumans	emailphone	none
d4notlibrary.com ↗	63 match 2 shared topics	d4not library — stop regenerating what already exists	en	technology-and-computing	robotsllmsaihumans	emailphone	none
devbookclub.org ↗	63 match 2 shared topics	Dev Book Club	en	technology-and-computing	robotsllmsaihumans	emailphone	none
meanderings.com ↗	63 match 2 shared topics	Marvelously Mindless Meanderings – One Liners of Mindless Meanderings	en	technology-and-computing WordPress	robotsllmsaihumans	emailphone	none
onlinemarkdown.com ↗	63 match 2 shared topics	Online Markdown Editor - Simple, Fast & Live Preview \| OnlineMarkdown.com	en	programming-languages	robotsllmsaihumans	emailphone	none
currentmillis.org ↗	63 match 2 shared topics	Current Millis - Convert Milliseconds to Date & Date to Milliseconds Online	en	technology-and-computing	robotsllmsaihumans	emailphone	none
developer-service.io ↗	63 match 2 shared topics	Developer Service - Articles, Videos & Books	en	programming-languages WordPress	robotsllmsaihumans	emailphone	none
dotnetrdf.org ↗	63 match 2 shared topics	dotNetRDF	en	technology-and-computing	robotsllmsaihumans	emailphone	none
datascienceplus.com ↗	63 match 2 shared topics	An online community for showcasing R & Python tutorials \| DataScience+	en	programming-languages WordPress	robotsllmsaihumans	emailphone	none
vishalgreen.com ↗	62 match 2 shared topics	Vishal Green	en	technology-and-computing	robotsllmsaihumans	emailphone	none
repoz.io ↗	62 match 2 shared topics	Repoz — Discover the best open source	en	technology-and-computing	robotsllmsaihumans	emailphone	none
dev-concepts.dev ↗	62 match 2 shared topics	Dev Concepts - Software Development e-books	en	technology-and-computing Gumroad	robotsllmsaihumans	emailphone	none
datezone.dev ↗	62 match 2 shared topics	Datezone	en	programming-languages	robotsllmsaihumans	emailphone	none
onlimemedia.com ↗	62 match 2 shared topics	Your tech specialist - Onlimemedia	en	programming-languages WordPress	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.