やるきのこ 瞬間英作文・英単語

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About this app

[Mastering Conversational English with Instant English Sentence Construction]

For adults who want to relearn English.

This app focuses on instant English sentence construction, which trains you to "translate thoughts into English," and on English vocabulary actually used in everyday life, rather than TOEIC preparation or test-taking. With approximately 14,000 example sentences using AI audio and automatic review based on the forgetting curve, you can effortlessly acquire conversational English.

■ Three Features of the App

◎ Train Your "Translation of Thoughts into English" with Instant English Sentence Construction
Strengthen your output skills with training that instantly converts from Japanese to English. You can switch between "Japanese → English" and "English → Japanese" for two types of training.

・Japanese → English: Training to create English sentences from Japanese (strengthening output)

・English → Japanese: Training to instantly understand the meaning of English sentences (strengthening reading and listening comprehension)

◎ Approximately 3,800 Carefully Selected Words in Order of Frequency in Everyday Conversation
Not for TOEIC or Eiken (English Proficiency Test) preparation, but rather words used by native speakers in actual conversations, arranged in order of frequency. This app solves the problem of "being able to read but not speak."

◎ Approximately 14,000 example sentences recorded with AI voice.

Natural pronunciation using Google Wavenet, supporting both American and British English. Example sentences are created with "phrases that can be used directly in everyday life" in mind. The sentences are read aloud by Tim's family and friends.


■ Learning Content

【Instant English Composition】
・Grammar Course: 1,245 example sentences
・Daily Conversation Course: 190 example sentences

【Vocabulary Learning】Approximately 3,800 words
・Beginner Level: 609 words
・Basic Level: 1,915 words
・Intermediate Level: 1,258 words

【Phrasal Verbs】293 phrasal verbs
・Practical expressions such as get up, look forward

【Idioms】100 idioms
・a blessing in disguise
・a penny for your thoughts (What are you thinking?)
and other idiomatic expressions essential for natural conversation

【Collocations】50 collocations
・Native-like word combinations such as do homework, do one's best

■ Main Features

【Automatic Review Based on Understanding Level】
Vocabulary cards are evaluated on a 4-level understanding scale (◎○△×). Based on the forgetting curve theory, which states that "people begin to forget immediately after learning," the cards are redisplayed at the optimal timing. It efficiently and effectively reinforces your memory.

[AI-Powered Pronunciation Learning]
Learn with natural pronunciation powered by Google Wavenet, switching between American and British English. Tim's family and friends read example sentences aloud. Audio speed is adjustable.

[My English Composition]
Bookmark instant English composition exercises you want to practice intensively for focused learning. Practice difficult sentence structures repeatedly.

[My Vocabulary]
Bookmark words you're interested in or struggle with to create your own vocabulary list. Overcome your weaknesses efficiently.

[Visualization of Learning Progress]
Maintain motivation with a learning calendar and achievement graph. See your daily learning record at a glance.

■ 14-Day Free Trial + One-Time Purchase

Start learning immediately without account registration.

For 14 days, you can try all the content of the full version for free.

You will not be automatically charged after the trial period ends.

[Full Version (One-Time Purchase)]
・All features are available with a one-time payment of 4,200 yen (tax included).
・One-time purchase: No automatic renewal or recurring charges.
・No additional charges: No additional fees after purchase.
・You can transfer your rights by "Restore Purchase" even when changing devices or reinstalling.

■ Recommended for:

・Working adults who want to restart learning English.
・Want to move beyond "I can read, but I can't speak."
・Want to improve speaking fluency with instant English composition.
・Want to efficiently learn vocabulary usable in everyday English conversation.
・Want to continue learning English easily in spare time.
・Those who couldn't stick with English vocabulary apps.
・Want to acquire practical English skills, not just TOEIC.
・Want to use it with a one-time purchase, not a subscription.

■ Learning Method

[Instant English Composition]
1. Select a course (Grammar/Everyday Conversation)
2. Select Japanese (front) → English (back) or English (front) → Japanese (back)
3. Look at the displayed card (Japanese) and try translating it into English.
4. Check your answers by looking at the back of the card.
5. Evaluate your understanding using the evaluation button.

[Vocabulary Learning]
1. Select your learning level (Beginner, Basic, Intermediate)
2. Check the English word, pronunciation, and meaning with the vocabulary card.
3. Listen to the audio and check your pronunciation.
4. Understand how to use the word in real life with example sentences.
5. Evaluate your understanding using the evaluation button.

Based on your evaluation, the cards will be redisplayed at the optimal time for you.

■ From the Developer

"Yarukino-ko" (Motivation Mushroom) is a name that reflects our desire for this app to be one that motivates you the more you use it. We've arranged words in order of their frequency in everyday conversation, and developed it with the aim of helping you acquire "English skills usable in real conversations" through example sentences and instant English sentence construction.

By continuing a little bit every day, your English skills will steadily improve. First, experience the app's benefits with a 14-day free trial.

*This app has been renamed from "English Vocabulary & Instant English Sentence Construction - Oneup Mushrooms".

Support: https://eastlabo.co.jp
Privacy Policy: https://eastlabo.co.jp/oneup-mushrooms/privacy-policy/
Terms of Service: https://eastlabo.co.jp/oneup-mushrooms/terms-of-service/
Developed by: EAST LABO Co., Ltd.
An English learning app for adults to improve their speaking skills through instant sentence construction and vocabulary. Features approximately 14,000 example sentences with AI audio and automatic review based on the forgetting curve. One-time purchase, 14-day free trial.
Updated on
Oct 2, 2026
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Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Personal info, Financial info, and Device or other IDs
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

・タブレットや画面の小さいスマートフォンで、単語学習の「OPEN」ボタンや瞬間英作文のカードが隠れる問題を修正しました
・タブレットでは、単語学習と瞬間英作文の画面を中央にスマートフォンと同じ幅で表示するようにしました
Content rating
Everyone
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App support

About the developer
EAST LABO, K.K.
support@eastlabo.co.jp
3-1-2, MINATOJIMANAKAMACHI, CHUO-KU KOBE PORT VILLAGE 1-1034 KOBE, 兵庫県 650-0046 Japan
+81 90-5747-5225