Kern (kern.cards)
Kern is an iPhone app for people who finish books and want to remember key ideas. Users type a book title to get swipeable flashcards and spaced repetition reviews, with offline use, no account, and no sign-up.
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What do Kern's numbers say?
What is Kern's Domain Rating?
Kern (kern.cards) has a Domain Rating of 15, measured from its backlink profile and refreshed continuously on VerifiedDR. It moved up 2 points over the last month.
What are the alternatives to Kern?
The listed websites closest to Kern in what they offer are frontendgeek.com (TrueDR 20), voedingsportenleefstijl.nl (TrueDR 18), Younes Site (TrueDR 17). VerifiedDR scores each of them the same way, so the comparison is like for like.
Who is behind Kern?
kern.cards is attributed to @jopetric (@jopetric), who proved ownership of the domain before the attribution was made.
How are these numbers measured?
Domain Rating is the standard 0-100 backlink score. TrueDR is VerifiedDR's own 0-100 score, built from backlinks, real traffic, domain age and spam evidence rather than derived from Domain Rating, which is why the two can disagree. Referring domains count distinct linking websites, and traffic is estimated monthly organic search visits. This listing is unverified: nobody has proved ownership of kern.cards, so its figures are refreshed less often than a verified site's. These figures were last refreshed on Oct 9, 2026.
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