Observed arrival · 2026-09-29
Usefull turns English reading into a level-aware vocabulary deck
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.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- 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
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
◎NicheUnusually specific use
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