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OPN Tracker - Odd Perfect Number Factorization Progress — 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 Databases →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
leadum.com ↗	63 match 2 shared topics	Database Documentation Tool by Leadum Software	en	databases phpBB	robotsllmsaihumans	emailphone	none
leansoftware.net ↗	62 match 2 shared topics	SQL data solutions, software for batch data processing validation import/export/file and integration solutions	en	databases DotNetNuke/DNN	robotsllmsaihumans	emailphone	none
antrow.info ↗	62 match 2 shared topics	Antrow Software - MS-Access to Web App migration	Germany~ en	software-and-applications	robotsllmsaihumans	emailphone	none
alimhasanov.com ↗	62 match 2 shared topics	Alim Hasanov \| Application and Data Management	en	databases	robotsllmsaihumans	emailphone	none
cmdshiftr.com ↗	62 match 2 shared topics	FileMaker Developers UK \| Bespoke Software \| Legacy Systems	en	software-and-applications WordPress	robotsllmsaihumans	email phone	none
eff-sys.com ↗	62 match 2 shared topics	Effective Systems, Inc. - Home	en	software-and-applications	robotsllmsaihumans	emailphone	none
2thet.com ↗	62 match 2 shared topics	2theT Workplace Innovation - Relational database Custom software Data integration Cross-platform Reporting SQL queries API integration Applications App development Workflow Automation Mobile apps	en	databases	robotsllmsaihumans	emailphone	none
spoc-web.net ↗	62 match 2 shared topics	Overview - Knowledge Management with Spoc-Web: enterprise and personal	en	software-and-applications Jimdo	robotsllmsaihumans	emailphone	none
damoncasey.co.uk ↗	62 match 2 shared topics	FileMaker Developer UK \| AppleScript Developer \| Automating Data	United Kingdom en	databases	robotsllmsaihumans	emailphone	none
csvimportexport.com ↗	61 match 2 shared topics	CSV Import & Export	en	databases	robotsllmsaihumans	emailphone	none
vizgres.com ↗	61 match 2 shared topics	vizgres — A keyboard-driven PostgreSQL client for the terminal	en	databases	robotsllmsaihumans	emailphone	none
vizquery.com ↗	61 match 2 shared topics	Visual Query - Linking drawings and Databases together	en	databases	robotsllmsaihumans	emailphone	none
allenlicensinggroup.com ↗	61 match 2 shared topics	EDICORE: Easy to Use One Click Database, Conversion, Translation, and Encryption Software.	en	software-and-applications	robotsllmsaihumans	emailphone	none
allenharrisanimation.com ↗	61 match 2 shared topics	EDICORE: Easy to Use One Click Database, Conversion, Translation, and Encryption Software.	en	software-and-applications	robotsllmsaihumans	emailphone	none
themanualscentral.com ↗	61 match 2 shared topics	The Manuals Central - Complete Manual Database for Windows	en	databases	robotsllmsaihumans	emailphone	partial · 8
spanna.app ↗	61 match 2 shared topics	Spanna — The MongoDB client that runs anywhere you do	en	databases	robotsllmsaihumans	emailphone	partial · 8
medienservice24.net ↗	61 match 2 shared topics	Individual-Software-Entwicklung aus Pforzheim \|\| MEDIENSERVICE24.net - #Applcations && Data Solutions \| Pforzheim	en	software-and-applications	robotsllmsaihumans	emailphone	none
allaccesssoftware.com ↗	61 match 2 shared topics	Custom Database Software with Microsoft Access	en	databases WordPress WooCommerce	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.