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Card 889 of 9712026-09-29 issue

Observed arrival · 2026-09-29

Usefull turns English reading into a level-aware vocabulary deck

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Editorial interest 74/100 Selection signal · not a rating of the site

This English-learning app analyzes pasted text sentence by sentence, then saves vocabulary above a learner’s estimated Eiken level alongside the sentences where it appeared.

Landing page captured for the 2026-09-29 issue.
For
English readers studying for Eiken or building vocabulary
Worth noticing
The site says level estimates combine public vocabulary lists with AI judgment, and are not based on an official Eiken vocabulary list.

Field notes

The workflow is designed to keep vocabulary tied to the sentence where it appeared: entries retain highlighted source text, can gather additional examples, and are scheduled for review. The page also describes a 2,000-character input limit and a free tier capped at 10 analyses per month and 300 saved words; it warns that AI explanations can contain errors.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible
✦PrettyNotable craft visible
◎NicheUnusually specific use

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Landing page observed 2026-09-29. The live site may have changed.