Observed arrival · 2026-10-22

折り単: an English wordbook that dog-ears your mistakes

oritan.app Visit website

Editorial interest 83/100 Selection signal · not a rating of the site

折り単 is a Japanese-language vocabulary app concept that teaches English words through picture-based multiple choice, themed wordbooks, and review of missed answers.

Landing page captured for the 2026-10-22 issue.

For: Japanese speakers studying English vocabulary
Worth noticing: The catalog lists 35 books and 3,810 words; custom AI cards are capped at 20 per subscription month and are not human-checked.

Field notes

The page divides the catalog into 18 TOEIC-oriented books (940 words) and five high-frequency-English books (2,430 words), alongside themed decks; it names the TOEIC Service List and New General Service List as sources. A five-word session uses several question formats, and missed terms collect in a personal review deck. The site says custom AI cards can be generated for up to 20 words per subscription month, while warning that those user-requested cards are not checked by humans.

Observed signals

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

$PaidCommerce or pricing visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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