HayaiLearn vs Gravity
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HayaiLearn
This platform uses AI-powered video immersion to help you learn Japanese. It provides translations, explanations, and vocabulary breakdowns for YouTube videos, making learning fun and natural.
- AI subtitle translations and explanations
- Interactive word meaning lookup
- 10,000+ pre-processed YouTube videos
- SRS video review and sentence mining
- Shadowing for pronunciation practice
- Word frequency lists and stats tracking
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Learn Japanese the way you'll actually stick with - by watching the YouTube content you already love. HayaiLearn ("hayai" means fast) turns any Japanese video into an interactive lesson with AI-powered subtitles, instant contextual translations, and real speaking practice. Immersion in easy mode. Most learners quit because they feel overwhelmed, short on time, or have nowhere to practice. HayaiLearn fixes all three: enjoyable content keeps you motivated, bite-sized study fits any schedule, and an AI conversation partner gives you unlimited practice. Learn from videos you enjoy 20,000+ Japanese videos, plus study any YouTube video yourself Every video graded 1-10 by difficulty, so you always find content at your level A personalized feed that surfaces what's most comprehensible to you right now AI that makes hard content easy Fully AI-parsed subtitles - far more accurate for slang and casual speech Tap any word for the meaning that fits this sentence, not a wall of definitions One-tap AI explanations break down grammar and sentence patterns on demand Actually speak the language Roleplay conversations built around the exact words and grammar you're learning The AI voices the scene, listens to your reply, and gives instant, explainable feedback Shadowing and pronunciation grading to sharpen your accent Remember what you learn Smart spaced-repetition Review for reading and listening, grounded in real clips Flashcard or multiple-choice, drilled in the context you first saw the word Frequency-based vocabulary lists with JLPT N5-N1 filters Track real progress XP across all four skills - Reading, Listening, Writing, Speaking Level up, build daily streaks, and watch words go from "just started" to "mastered" Mine and save sentences, organize videos into albums, and study your way Built for the full journey Input builds comprehension. Output builds fluency. HayaiLearn is the only tool that covers both - turning the shows you love into the fastest path to speaking Japanese. A paid subscription is required to access content and features. You can start with a free 7-day trial; cancel anytime. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.hayailearn.com/company/privacy-policy
Gravity
Learn Japanese by capturing real-world text from your surroundings. This app creates personalized flashcards and study plans based on the vocabulary you encounter daily, making learning practical and context-driven.
- Personalized learning plans
- Instant vocabulary extraction from photos
- Smart review system
- Context-based flashcards
- Immersion-focused learning
- Daily learning sessions
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LEARN LANGUAGES THE FAST WAY - THROUGH VIDEOS! (Now with Mandarin Chinese support!) ◆ Learn Japanese and Mandarin Chinese through the content you already love. ◆ Gravity is an immersion-first language app that turns real videos and music into personalized learning. Doomscroll short native clips, sing along in Karaoke Mode, or pick something from a hand-curated library of native videos, each one transcribed word by word and levelled for learners. ◆ Whether you're into anime, J-pop, C-dramas, music, or YouTube creators, Gravity helps you build real language skills through context instead of generic textbook lessons. WHY CHOOSE GRAVITY? → Doomscroll to fluency: Moments turns scrolling into learning with a feed of short clips from native content. → Curated video library: native videos across anime, music, entertainment, creators, and more, levelled from complete beginner to advanced. → Word-synced transcripts: follow along word by word as the audio plays, with an English translation for every line that you can show or hide. → Karaoke Mode: follow the lyrics of songs you love, understand every line, and pick up vocabulary through music. → Tap to learn: tap any word for its reading, meaning, and an AI explanation, then save it in one tap. → Context-based flashcards: every saved word keeps the moment it came from, so you can replay the original clip while you review. → Smart spaced repetition: reviews are scheduled so each word comes back right before you'd forget it. → Practice right after watching: review the words you just saved as soon as you finish a video. → Daily word goals and reminders: stay consistent without overwhelming study sessions. BUILT FOR EACH LANGUAGE Japanese → Furigana, romaji, or no reading aids. Your choice. → Pitch accent graphs and dictionary meanings on every card. → Anime, J-pop, podcasts, streams, and more, levelled from Pre-JLPT to N1. Mandarin Chinese → Pinyin with tone marks, or turn it off. → Simplified characters, with traditional forms shown alongside. → C-dramas, music, and more, levelled from Pre-HSK to HSK 6. WHAT YOU'LL LEARN ◆ Real vocabulary and phrases, the way native speakers actually use them. ◆ Listening and reading skills through authentic videos, songs, and clips. ◆ Words from the shows, music, and creators you already watch. ◆ Language you'll actually hear, not just textbook examples. WHO IT'S FOR → Anime, J-pop, C-drama, and music fans who want to learn from what they already love. → Learners who already spend hours watching videos and scrolling online. → Travelers, international students, and people living or working abroad. → Busy learners who want immersion to fit naturally into their day. → Anyone tired of repetitive textbook lessons and overwhelming flashcard decks. HOW IT WORKS 1. Choose Japanese or Mandarin Chinese and your level. 2. Watch a video, scroll Moments, or sing along with a song. 3. Tap unfamiliar words to see what they mean and save them. 4. Gravity turns your saved words into flashcards, each linked to its original moment. 5. Review a few minutes a day and watch your known words grow. LEARN THROUGH WHAT YOU LOVE Doomscroll in the language you're learning. Watch videos. Sing your favorite songs. Gravity turns the content you already want to watch into something you can actually learn from. GRAVITY IS IN EARLY ACCESS. Any bugs, issues, or feedback can be directed to support@learngravity.com. Privacy: https://learngravity.com/privacy Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: HayaiLearn at 4.5 against Gravity's 4.1. On price, review sentiment, ratings volume and update cadence there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. HayaiLearn sells 8 in-app purchases, starting at $12.99 per month and Gravity sells 6 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
HayaiLearn holds the better App Store score, 4.5 against 4.1. Both are backed by a comparable volume of ratings — 39 and 35 respectively. Written reviews complicate that: 60% of HayaiLearn's written reviews are positive against 68% of Gravity's, so the app with the better star average is not the one people write more warmly about.
HayaiLearn ships an update every 2 weeks, Gravity every 9 days. Both last shipped on October 25, 2026.
| Parameter | HayaiLearn | Gravity |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (39 ratings) — better | 4.1 (35 ratings) |
| Positive reviews | 60.0% of reviews | 67.9% of reviews — better |
| Number of ratings | 39 — better | 35 |
| Update frequency | Every 2 weeks | Every 9 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 15.1 — better |
| Further details — not scored | ||
| Size | 112 MB | 109 MB |
| Age rating | 12+ | 4+ |
| Developer | Fallen Cloud Studios LLC | Heimdall Space Inc. |
Customer experience
HayaiLearn
Gravity
In-app purchases
HayaiLearn
- Pro$12.991 Month
- Pro Access7 Days trial$12.991 Month
- Platinum$24.991 Month
Show 4 moreShow fewer
- Pro Access7 Days trial$69.991 Year
- Pro Access7 Days trial$99.991 Year
- Platinum7 Days trial$129.991 Year
- Platinum7 Days trial$184.991 Year
- Pro Access$249.99
Gravity
- special offer$4.991 Month
- Fluency$6.997 Days
- Immersive Monthly7 Days trial$8.991 Month
Show 3 moreShow fewer
- Immersive Monthly7 Days trial$11.991 Month
- Immersion7 Days trial$14.991 Month
- Polyglot7 Days trial$69.991 Year








