IELTS words you learned,
never forget again
Spaced repetition based on the forgetting curve
for efficient vocabulary building
7-day free trial / from ¥590/mo
Studied the words,
but keep forgetting them?
Words won't stick
no matter how many times you review
You go through the same word list over and over, but can't recall them on test day...
Newly learned words
fade away quickly
Words you studied yesterday are already gone today...
Not sure when
to review
Without knowing the right review timing, you end up wasting precious study time...
The forgetting curve and optimal review timing
The forgetting curve
is the answer.
By reviewing just before your memory fades,
you lock words into long-term memory efficiently.
- AI calculates the optimal review timing automatically
- Cut unnecessary repetition by 50%
- Triple your retention rate
3 Key Features
Science-Based Review Timing
Reviews are scheduled right before your memory fades,
based on the forgetting curve. Less repetition, better retention.
High-Frequency IELTS Vocabulary
A curated collection of words that appear frequently on the IELTS.
Study efficiently at your level.
Visual Progress Tracking
See your daily study progress in clear graphs.
Visible growth keeps you motivated.
How It Works
Learn New Words
Pick up new vocabulary with flashcards designed for efficient learning.
AI Quizzes You at the Right Time
The forgetting curve determines when to review. You get reminders at the optimal moment.
Words Stick for Good
Less wasted repetition, more efficiency. Words move into your long-term memory.
Pricing Plans
3-Month Plan
Total ¥1,770
- All words unlocked
- Ad-free
- Detailed study stats
- Ideal duration for IELTS prep
Lifetime Plan
One-time purchase, use forever
- All words unlocked
- Ad-free
- Detailed study stats
- Permanent access
What Our Users Say
「The review timing based on the forgetting curve is spot on. I can actually remember the words now.」
「Love that there's a one-time purchase option with no monthly fees. Best value compared to other apps.」
「Simple and easy to use. No unnecessary features, so I can focus on studying.」
Frequently Asked Questions
Yes, the core features are completely free. Premium plans unlock access to all words, detailed study statistics, and more. There is also a 7-day free trial with no automatic charges after it ends.
WordSprint caters to a wide range, from beginners to advanced learners aiming for IELTS 7.0 and above. A diagnostic test at the start places you at the right level.
We recommend about 10 to 15 minutes per day. The app uses the forgetting curve to present review questions at the optimal time, so even short sessions lead to effective retention.
Subscription plans can be cancelled through your App Store settings. If you purchased the lifetime plan, no cancellation is needed -- you have permanent access.