Japanese Grammar Rules vs Gravity
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Japanese Grammar Rules
This app focuses on understanding Japanese grammar to comprehend spoken and written language. It provides structured lessons and phrase breakdowns to build a strong foundation for learners.
- 67 Structured Lessons
- Phrase Breakdowns
- Authentic Native Audio
- Practical Dialogues
- Smart Reference Guides
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Stop memorizing random sounds. Start understanding what they mean. Japanese Grammar Rules is a grammar-first Japanese learning app built to turn the "walls of sound" you encounter into windows of understanding. Most beginners struggle because they can read the sounds (kana), but don't know who did what, to whom, when, or why. Japanese Grammar Rules provides the "Ashiba" (scaffolding) you need to bridge that gap. We focus on structured grammar because you cannot learn a language just by hearing it in the background—you learn by understanding input. With 67 progressive lessons, Japanese Grammar Rules takes you from absolute beginner to reading real Japanese content (like manga) by teaching you the underlying logic of the language. Features - 67 Structured Lessons: Organized logically around essential Japanese grammar patterns. - Phrase Breakdowns: Every sentence is dissected—particles, conjugations, and vocabulary—so nothing is a mystery. - Authentic Native Audio: High-quality audio for every phrase and dialogue to train your ear from day 1. - Practical Dialogues: See grammar in action through natural, conversational examples. - Smart Reference: Instantly access grammar and vocabulary guides whenever you need them. Why Japanese Grammar Rules? - Grammar as Scaffolding: Understand the rules so you can break down any sentence you hear or read. - Comprehensible Input: We don't just give you phrases; we explain exactly how they are built. - Real Momentum: Reach the point of reading real Japanese sooner by focusing on the core patterns that actually matter. Why I Built Japanese Grammar Rules I’ve always loved Japan. I’ve traveled there many times, and having real conversations with locals was always my dream. When I decided to seriously learn Japanese, I tried many tools. I used Duolingo and Rosetta Stone, but they felt too gamified and didn’t explain enough grammar. I studied from traditional textbooks like Minna no Nihongo, which were excellent but lacked an interactive, modern digital format. I found myself constantly relying on a jisho (辞書) Japanese dictionary to look up words and desperately wanted a free language app that wove vocabulary and grammar together naturally. My goal was clear: properly master 日本語 (Japanese) and prepare for the JLPT N5 without feeling lost in a sea of memorization. Japanese Grammar Rules is the tool I wish I had: a clear, logical, and audio-rich path to true Japanese comprehension. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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: Japanese Grammar Rules at 5.0 against Gravity's 4.2. Japanese Grammar Rules also leads on review sentiment (100% vs 69%). Gravity's advantage is ratings volume (45 vs 3) and iOS requirement (15.1 vs 17.6). On price, update cadence, ads and in-app purchases 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. Japanese Grammar Rules sells 3 in-app purchases, starting at $4.99 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.
Japanese Grammar Rules holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Gravity has 45 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 100% of Japanese Grammar Rules's written reviews are positive against 69% of Gravity's.
Japanese Grammar Rules ships an update every 5 days, Gravity weekly. The most recent releases landed on November 5, 2026 and November 7, 2026 respectively.
| Parameter | Japanese Grammar Rules | Gravity |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | 4.2 (45 ratings) |
| Positive reviews | 100.0% of reviews — better | 68.8% of reviews |
| Number of ratings | 3 | 45 — better |
| Update frequency | Every 5 days — better | Weekly |
| 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 | 17.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 23 MB | 112 MB |
| Age rating | 4+ | 4+ |
| Developer | Le Huang | Heimdall Space Inc. |
Customer experience
Japanese Grammar Rules
Gravity
In-app purchases
Japanese Grammar Rules
- Monthly$4.991 Month
- Yearly$49.991 Year
- Lifetime Access$99.99
Gravity
- special offer$4.991 Month
- Fluency$6.997 Days
- Immersive Monthly7 Days trial$8.991 Month
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- Immersive Monthly7 Days trial$11.991 Month
- Immersion7 Days trial$14.991 Month
- Polyglot7 Days trial$69.991 Year









