Comparison

Nihondex vs Gravity

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

Head to head
About

Nihondex

Master Japanese vocabulary, grammar, and kanji with a structured learning path. Utilizes spaced repetition for efficient memorization and includes interactive games and reading practice. Offers detailed progress tracking and social features to enhance your learning journey.

Highlights
  • Spaced repetition system (SRS)
  • Kana games
  • Conjugation practice
  • Reading comprehension
  • Island Builder game
  • Progress tracking
Features
Read full description

Master Japanese from zero to fluent, at your own pace. Nihondex is a structured Japanese learning app that takes you from absolute beginner to advanced level. No fluff, no endless loops just steady, measurable progress built around proven spaced repetition science. WHAT YOU'LL LEARN • 7,500+ vocabulary words organized by JLPT level (N5 to N1) • 800+ grammar patterns with interactive exercises and real examples • 4,000+ kanji characters with stroke order and readings • All 92 hiragana and katakana characters through fun, interactive games • Japanese conjugation: plain, polite, negative, past, te-form and more • Reading comprehension with graded stories from N5 to N1 HOW IT WORKS Every day you learn a batch of new vocabulary and grammar points. Nihondex's spaced repetition system (SRS) then schedules your reviews at the perfect moment right before you forget. This daily loop is how real progress is built. KEY FEATURES • Smart SRS reviews that adapt to your learning pace • Kana games combining memory, writing, and speed drills • Conjugation practice with all major verb forms • Reading practice with tap-to-look-up vocabulary • Island Builder earn coins and decorations as you progress, build and customize your own Japanese island • Detailed progress tracking and statistics • Daily goals to keep your streak alive • Leaderboards and social features to learn with friends Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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/

Screenshots

Nihondex4 screens
Gravity4 screens

Verdict

The call

The clearest difference is rating: Nihondex at 4.9 against Gravity's 4.1. Nihondex also leads on review sentiment (100% vs 68%). On price, ratings volume, update cadence and ads 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. Nihondex sells 3 in-app purchases, starting at $7.99 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.

ReceptionRating · Positive reviews · Number of ratings

Nihondex holds the better App Store score, 4.9 against 4.1. Both are backed by a comparable volume of ratings — 27 and 35 respectively. Written reviews point the same way: 100% of Nihondex's written reviews are positive against 68% of Gravity's.

UpkeepUpdate frequency

Nihondex ships an update weekly, Gravity every 9 days. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 8 level
Nihondex versus Gravity: the parameters behind the verdict, then further details
ParameterNihondexGravity
PriceFreeFree
Rating4.9 (27 ratings) — better4.1 (35 ratings)
Positive reviews100.0% of reviews — better67.9% of reviews
Number of ratings2735 — better
Update frequencyWeekly — betterEvery 9 days
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size1 MB109 MB
Age rating4+4+
DeveloperThomas MauranHeimdall Space Inc.

Customer experience

Nihondex

All ratings18 ratings
Positive94.4%
Neutral0.0%
Negative5.6%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Gravity

All ratings35 ratings
Positive77.1%
Neutral0.0%
Negative22.9%
Written reviews28 reviews
Positive67.9%
Neutral3.6%
Negative28.6%

In-app purchases

3 purchases

Nihondex

Subscriptions2
  • Monthly$7.991 Month
  • Yearly$71.991 Year
One-time1
  • Lifetime$129.00
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

Questions

Is Nihondex free?
Nihondex is free to download, with in-app purchases available.
Is Gravity free?
Gravity is free to download, with in-app purchases available.
Which has better reviews, Nihondex or Gravity?
Nihondex is rated higher. Nihondex averages 4.9 out of 5 from 27 ratings, while Gravity averages 4.1 from 35 ratings.
Do Nihondex or Gravity have ads?
Neither Nihondex nor Gravity shows ads.
Which is updated more often, Nihondex or Gravity?
Nihondex ships an update weekly, and Gravity every 9 days. Most recently, Nihondex was updated on October 28, 2026 and Gravity on October 25, 2026.

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