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Opal — Handwritten Notes & Spaced Repetition for macOS & iPad — 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 Software And Applications →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
lycheenote.com ↗	68 match 2 shared topics	Lychee: Free Local-First Notes App for Mac, Windows & Linux	en	software-and-applications	robotsllmsaihumans	emailphone	none
useforma.app ↗	68 match 2 shared topics	Forma - Visual Notes and Tasks on an Infinite Canvas for macOS	en	software-and-applications	robots llmsaihumans	emailphone	none
updockapp.com ↗	66 match 2 shared topics	UpDock \| Productivity for macOS	en	software-and-applications	robotsllmsaihumans	emailphone	none
usebrainbits.com ↗	66 match 2 shared topics	Brainbits — The Notes App for Your Biggest Ideas	en	productivity	robotsllmsaihumans	emailphone	none
planedition.com ↗	66 match 2 shared topics	PlanEdition - All-in-One - Notes, Tasks, Calendar, and Reminders	en	productivity	robotsllmsaihumans	emailphone	none
actionpad.app ↗	65 match 2 shared topics	Actionpad \| Meeting agendas, action items & collaborative notes — Actionpad	en	productivity	robotsllmsaihumans	emailphone	none
sanifu.ai ↗	65 match 2 shared topics	Sanifu — Automate the repetitive work spreadsheets are used for	en	software-and-applications	robotsllmsaihumans	emailphone	none
upnextapp.com ↗	65 match 2 shared topics	Up Next - Productivity App for macOS	en	productivity Paddle	robotsllmsaihumans	emailphone	none
usetendril.com ↗	65 match 2 shared topics	Tendril - Offline Mind Mapping App for Mac and Windows	en	software-and-applications	robotsllmsaihumans	emailphone	none
a3note.com ↗	65 match 2 shared topics	A3note — Your notes, everywhere	en	software-and-applications	robotsllmsaihumans	emailphone	full · 14
happilyeverapps.com ↗	65 match 2 shared topics	Happily Ever Apps — Productivity & Focus Tools for Mac & iOS	en	productivity	robotsllmsaihumans	emailphone	none
playthingapp.com ↗	65 match 2 shared topics	Plaything — Index Card Notes	en	software-and-applications	robotsllmsaihumans	emailphone	none
usecoves.com ↗	65 match 2 shared topics	Coves — Coworking Space Management Software	en	software-and-applications	robotsllmsaihumans	emailphone	none
usefluks.com ↗	65 match 2 shared topics	Fluks Notes	en	productivity	robotsllmsaihumans	emailphone	partial · 8
axinite.ai ↗	64 match 2 shared topics	Axinite	en	software-and-applications	robotsllmsaihumans	emailphone	none
abracal.app ↗	64 match 2 shared topics	Cal — Scheduling infrastructure for everyone	en	software-and-applications	robotsllmsaihumans	emailphone	none
actiondrivennote.com ↗	64 match 2 shared topics	ActionDrivenNote - Actions get done, but notes stay.	en	productivity	robotsllmsaihumans	emailphone	none
4notepad.com ↗	64 match 2 shared topics	Online 4Notepad - Write, Save, and Share Notes on the Web	en	software-and-applications	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.