Comparison

Gravity vs Nihongo Diary

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Personalized learning plans
  • Instant vocabulary extraction from photos
  • Smart review system
  • Context-based flashcards
  • Immersion-focused learning
  • Daily learning sessions
Features
Read full description

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/

About

Nihongo Diary

Practice writing Japanese daily with AI-powered corrections and explanations. Connect with a community of learners for feedback and motivation, helping you build a consistent study habit and improve fluency.

Highlights
  • Daily Japanese writing prompts
  • AI-powered text correction with furigana
  • Detailed explanations for mistakes
  • Community feedback and interaction
  • Streak tracking and motivation tools
  • Word-tap translation
Features
Read full description

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

Gravity4 screens
Nihongo Diary4 screens

Verdict

The call

The clearest difference is rating: Nihongo Diary at 5.0 against Gravity's 4.1. Gravity's advantage is ratings volume (39 vs 1). 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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

Nihongo Diary holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: Gravity has 39 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Gravity ships an update every 9 days, Nihongo Diary every 10 days. The most recent releases landed on October 31, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 8 level
Gravity versus Nihongo Diary: the parameters behind the verdict, then further details
ParameterGravityNihongo Diary
PriceFreeFree
Rating4.1 (39 ratings)5.0 (1 ratings) — better
Positive reviews67.9% of reviews—
Number of ratings39 — better1
Update frequencyEvery 9 days — betterEvery 10 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.115.0 — better
Further details — not scored
Size109 MB17 MB
Age rating4+17+
DeveloperHeimdall Space Inc.Tetta Taguchi

In-app purchases

6 purchases

Gravity

Subscriptions6
  • special offer$4.991 Month
  • Fluency$6.997 Days
  • Immersive Monthly7 Days trial$8.991 Month
Show 3 more
  • Immersive Monthly7 Days trial$11.991 Month
  • Immersion7 Days trial$14.991 Month
  • Polyglot7 Days trial$69.991 Year
2 purchases

Nihongo Diary

Subscriptions2
  • Plus$9.991 Month
  • Pro$19.991 Month

Questions

Is Gravity free?
Gravity is free to download, with in-app purchases available.
Is Nihongo Diary free?
Nihongo Diary is free to download, with in-app purchases available.
Which has better reviews, Gravity or Nihongo Diary?
Nihongo Diary is rated higher. Gravity averages 4.1 out of 5 from 39 ratings, while Nihongo Diary averages 5.0 from 1 ratings.
Do Gravity or Nihongo Diary have ads?
Neither Gravity nor Nihongo Diary shows ads.
Which is updated more often, Gravity or Nihongo Diary?
Gravity ships an update every 9 days, and Nihongo Diary every 10 days. Most recently, Gravity was updated on October 31, 2026 and Nihongo Diary on October 25, 2026.

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