Gravity vs Nihongo Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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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ABOUT THIS APP ◆ Learn Japanese through the content you already love. ◆ Gravity is an immersion-first Japanese learning app that turns videos, music, and real-world Japanese into personalized learning experiences. Doomscroll through Japanese content, sing along with your favorite songs in Karaoke Mode, explore a massive library of Japanese videos, or capture Japanese from the world around you. ◆ Whether you’re learning through anime, YouTube, J-pop, manga, travel, or everyday life, Gravity helps you build real Japanese through context instead of generic textbook lessons. WHY CHOOSE GRAVITY? → Doomscroll Japanese: turn scrolling into learning with an endless feed of Japanese videos built for immersion. → Massive video library: learn from Japanese videos across anime, entertainment, podcasts, creators, music, and more. → Karaoke Mode: follow along with Japanese songs, understand the lyrics, and learn vocabulary through music you already love. → Tap-to-learn videos: instantly look up words while watching and save useful vocabulary for later. → Personalized learning: Gravity adapts to the Japanese you watch, save, and encounter. → Instant vocabulary extraction: turn photos and screenshots into study material in seconds. → Context-based flashcards: remember words through the original videos, sentences, and situations where you found them. → Smart review system: focus on the vocabulary most relevant to you. → Daily learning plans: stay consistent with manageable study sessions tailored to your progress. WHAT YOU'LL LEARN ◆ Real Japanese vocabulary and phrases used in videos, music, conversations, and everyday life. ◆ Listening and reading skills through authentic Japanese content. ◆ Vocabulary from anime, YouTube, J-pop, manga, signs, menus, and screenshots. ◆ Common expressions for travel, school, work, restaurants, shopping, and conversations. ◆ Personalized vocabulary based on your interests and the content you consume. ◆ Japanese you’ll actually encounter — not just textbook examples. WHO IT'S FOR → Anime, manga, J-pop, and Japanese media fans. → Learners who already spend hours watching videos and scrolling online. → Travelers preparing for Japan. → International and exchange students. → People living or working in Japan. → Busy learners who want Japanese immersion to fit naturally into their day. → Anyone tired of repetitive textbook lessons and overwhelming flashcard decks. HOW IT WORKS 1. Choose a Japanese video, song, or piece of real-world content. 2. Watch, scroll, or sing along while Gravity helps you understand the Japanese. 3. Tap unfamiliar words to learn them instantly and save them to your vocabulary. 4. Gravity turns what you encounter into personalized flashcards and reviews. 5. Keep immersing, and your learning experience becomes more personalized over time. LEARN JAPANESE THROUGH WHAT YOU LOVE Doomscroll Japanese. Watch videos. Sing your favorite songs. Explore anime, YouTube, and real-world content. Gravity turns the Japanese you already want to consume into something you can actually learn from. **GRAVITY IS IN EARLY ACCESS.** Any bugs, issues, or feedback can be directed to [support@learngravity.com](mailto:support@learngravity.com). Privacy: https://learngravity.com/privacy Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Nihongo Diary
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Nihongo Diary — Write Japanese every day. Get it corrected. Keep going. Writing is the fastest way to make Japanese stick — but only if someone corrects you, and only if you keep showing up. Nihongo Diary gives you both. WRITE & GET CORRECTED - Write a short diary entry in Japanese — any level, any length - AI correction shows your corrected text in seconds, with furigana on every kanji - See a natural, native-like version of what you wrote - Understand every fix with clear explanations, key mistakes, and vocabulary - Ask the community: real learners (and their corrections) alongside AI YOU'RE NOT DOING IT ALONE - Share entries to the community feed and cheer each other on - Get corrections and comments from fellow learners around the world - Follow friends, react to entries, and reply to comments - Push notifications remind you to write and tell you when someone responds KEEP YOUR STREAK ALIVE - Daily streaks and milestones keep you motivated - Calendar view of everything you've written - Word-tap translation while reading other learners' entries - Obie, your study buddy, celebrates your progress Made by Tetsu, a native Japanese teacher in Sapporo, for learners who want to actually use their Japanese — not just study it. Free to start. Write your first entry today. Terms of Use: https://nihongodiary.app/terms
Screenshots
Verdict
Gravity and Nihongo Diary are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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. Gravity sells 6 in-app purchases, starting at $4.99 per month and Nihongo Diary sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
Gravity ships an update every 9 days, Nihongo Diary every 10 days. The most recent releases landed on October 16, 2026 and September 25, 2026 respectively.
| Parameter | Gravity | Nihongo Diary |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (23 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 23 — better | — |
| Update frequency | Every 9 days — better | Every 10 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 102 MB | 17 MB |
| Age rating | 4+ | 17+ |
| Developer | Heimdall Space Inc. | Tetta Taguchi |
In-app purchases
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
Nihongo Diary
- Plus$9.991 Month
- Pro$19.991 Month









