Experience a new, in-depth English learning experience! GOIKOI uses lines from movies and TV shows as example sentences, allowing you to fully visualize the nuances of each word. Anyone can easily master English vocabulary in context, just like an advanced learner.

Language acquisition research has shown that vocabulary is more easily retained when presented in context (Schmitt, 2000; Nation, 2001).
Memorizing individual words individually contradicts the brain's natural memory process.
Language's true power is realized when it's used meaningfully, not memorized in a vocabulary book.
Experience innovative English learning that inspires you!

◈ Fully compatible with EIKEN®, university entrance exams, and TOEIC®!
In addition to EIKEN®, university entrance exams, and TOEIC®, it also covers the basics of middle and high school English.
Aim for your goal in the shortest route with a vocabulary list based on frequency and difficulty!

◈ The vocabulary network unifies fragmented memories.

Derivatives, synonyms, antonyms, and British/American spellings are connected like a map, exponentially improving your vocabulary. This structured learning approach promotes efficient and deep vocabulary retention.

◈ Designed with the four English skills in mind.

The app offers a wide range of features, including spelling check and shadowing with AI pronunciation evaluation, to help you put your vocabulary understanding into practice.


◈ AI x Algorithm: Next-Generation Memory Plan
Going beyond simple forgetting curves and SuperMemo theory, GOIKOI's review algorithm offers flexible learning plans tailored to each user's progress. GOIKOI's AI combines a variety of data, including vocabulary difficulty, frequency of use, and learning history, to propose an "evolved memory plan" optimized for each individual.

[Recommended for]
- Aiming to improve your TOEIC® or Eiken® score
- Want to be able to use the vocabulary you've learned in real conversations and sentences
- Want to enjoy English movies and TV shows without subtitles
- Want to be able to understand native English speakers and improve your pronunciation
- Want to use technology to learn more efficiently

Try GOIKOI for free now
First-time users receive a 3-day free trial with full access to Pro features.
No registration or cancellation procedures are required, and the free version will automatically switch to the free version after the trial period, so you can use it with confidence.
Feel free to try it out for yourself! Welcome to GOIKOI!

*Eiken® is a registered trademark of the English Language Proficiency Test Foundation of Japan. This app and service are not endorsed or affiliated with ETS or the English Language Proficiency Test Foundation of Japan.
*TOEIC is a registered trademark of Educational Testing Service (ETS) in the United States and other countries. This app is not approved or endorsed by ETS.

About Paid Plans
- This subscription is an auto-renewing subscription.
- You can stop auto-renewal by canceling at least 24 hours before the end of the current period.
- You cannot cancel your subscription from within the app. You can do so through "Subscriptions" on your device. Please note that simply deleting the app will not cancel your subscription.
- Payment will be charged to your Google Play account.

How to Cancel a Subscription
1. Access Google Play Subscriptions on your Android device.
2. Select the subscription you want to cancel.
3. Tap "Cancel Subscription."
4. Follow the on-screen instructions. Tap "Cancel Subscription."

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