FlipShadow - Flash Cards
Train Retrieval Speak Fluently
Free · In‑App Purchases
Learn Languages Through Sentence Memorization
Memorizing words alone won't help you speak. Studying grammar doesn't guarantee fluency in real conversations.
Why? Because you haven't trained your brain to "retrieve" sentences.
This app combines flashcard retrieval training with a scientific spaced repetition algorithm to make memorized sentences come out naturally in conversation.
■ Key Features
▸ Flashcard Retrieval Training
Practice retrieving sentences from your brain.
Memorized sentences will automatically come out in real conversations.
▸ Scientific Spaced Repetition Algorithm (Anki-style)
Automatically calculates your optimal study schedule for efficient memorization.
Review at the perfect timing based on the forgetting curve.
▸ Choose Your Own Sentences
Memorize only the sentences you'll actually use.
Build personalized learning decks for your specific needs.
▸ Learning Statistics & Progress Tracking
Monitor your learning status with detailed statistics.
See at a glance how much you've memorized and retained.
▸ iCloud Sync
Study seamlessly across iPhone, iPad, and Mac.
Your learning progress syncs automatically across all devices.
▸ CSV File Import
Easily import your own learning materials via CSV files.
Materials created in Excel or Google Sheets work instantly.
■ Perfect For
- Those who know words but can't speak
- Those who studied grammar but struggle in real conversations
- Anyone who wants to memorize efficiently
- Anki users who found it too complex
- Learners who want to choose only useful sentences
■ Why Memorize Sentences?
Word memorization: "apple" = apple
→ "I ate an apple" doesn't come out automatically in conversation
Sentence memorization: "I ate an apple yesterday"
→ The entire sentence comes out naturally when the situation arises
When you memorize sentences, grammar, word order, and expressions stick together as chunks. This is real speaking ability.
■ What is Spaced Repetition?
A method of reviewing at optimal intervals based on the human forgetting curve.
- After 1 day → 3 days → 7 days → 14 days...
Repeating with increasing intervals converts information into long-term memory.
The app automatically calculates "today's review cards," so you just need to open the app and study every day.
■ Start Now
Experience memorized sentences coming out naturally.
Enjoy the pleasure of efficient memorization through scientific methods.
Start now.
- Terms of use
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Added a Speech section in Settings.
- You can pick a voice per language and preview it.
- Download more voices from iOS Settings.
The developer, Jong Seon Lee, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jong Seon Lee
- Size
- 4.4 MB
- Category
- Education
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
English and 6 more
- English, French, German, Japanese, Korean, Simplified Chinese, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Lifetime Subsription $9.99
- Copyright
- © 2026 Lee Jong Seon