Comparison

Gravity vs Mojien

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 and Mandarin Chinese through authentic videos and music. This immersion-first app uses real content, word-synced transcripts, and interactive flashcards to build practical language skills. Enjoy personalized learning tailored to your interests, from anime to C-dramas.

Highlights
  • Learn through native videos and music
  • Word-synced transcripts with translations
  • Interactive flashcards with spaced repetition
  • Karaoke Mode for song-based learning
  • Personalized learning feed
  • Supports Japanese and Mandarin Chinese
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

Mojien

Read full description

Master Japanese your way: With a powerful dictionary, smart flashcards, grammar lessons, quizzes, and writing practice, all in one beautifully designed app. Whether you're starting from your first hiragana or pushing toward JLPT N1, Mojien gives you everything you need to read, write, and remember Japanese. Build real knowledge with spaced repetition that schedules each card at the perfect moment, so you study less and remember more. ========= 1. A COMPLETE JAPANESE DICTIONARY - Search hundreds of thousands of words, kanji, and example sentences - Detailed entries with readings, meanings, and JLPT levels - Look up kanji by meaning, reading, or radical - Full conjugation tables for every verb and adjective - Works offline — look up words anywhere - No account needed — search the dictionary for free ========= 2. SMART FLASHCARDS - Spaced repetition (FSRS) that adapts to how well you know each card - Add images and audio to your cards - Build your own decks, or study ready-made ones - Study with classic flashcards or full quiz sessions ========= 3. QUIZZES THAT MAKE IT STICK - Multiple-choice questions in both directions — Japanese to English and back - Tile questions: spell out the answer by tapping character tiles - Matching rounds that pair Japanese words with their meanings - Typed-answer questions for true recall, not just recognition ========= 4. WRITING PRACTICE - Practice writing hiragana, katakana, and kanji with guided stroke order - Stroke-by-stroke feedback as you draw each character - Learn kanji by school grade or JLPT level, or build your own practice sets - Find and practice kanji by radical ========= 5. GRAMMAR LESSONS - Clear, structured lessons from beginner to advanced - Organized by JLPT level (N5–N1) - Start learning N5 grammar free, no account required ========= 6. COMMUNITY DECKS - Discover and study flashcard decks shared by other learners - Share your own decks with the community - Find decks for vocabulary, kanji, anime, travel, and more ========= 7. JAPANESE TYPING PRACTICE - Learn to type real Japanese with a dedicated typing trainer - Practice with the flick keyboard or romaji input - Words matched to your level, from JLPT N5 to N1 - Track your speed, accuracy, and words completed ========= 8. HOME SCREEN WIDGETS - Keep Japanese in sight with kanji and study widgets on your home screen - Review kanji, open quick search, and jump back into study faster - Customize widgets to match the way you study ========= 9. STREAKS, XP & LEVELS - Keep your streak alive with daily study - Earn XP for every quiz, lesson, and writing session - Longer streaks multiply your XP — consistency pays off - Level up and climb the global and weekly leaderboards ========= WHY MOJIEN - Designed for serious learners and total beginners alike - All the Japanese learning resources you need in one place - Everything connected: look up a word, add it to a deck, and review it later Start learning Japanese today and build a real foundation in the language! --- Unlock the full Mojien experience with Mojien Pro: unlimited decks, every grammar lesson, complete writing practice, and more. Choose a monthly or yearly auto-renewing subscription with a 14-day free trial, or make a one-time Lifetime purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple Account settings. Lifetime is a one-time purchase with no recurring charges. Privacy Policy: https://mojien.com/privacy Terms of Use: https://mojien.com/terms

Screenshots

Gravity4 screens
Mojien4 screens

Verdict

The call

The clearest difference is iOS requirement: Mojien at 13.0 against Gravity's 15.1. On price, ads, in-app purchases and device support 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 Mojien sells 3 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Scorecard1 real difference · 9 level
Gravity versus Mojien: the parameters behind the verdict, then further details
ParameterGravityMojien
PriceFreeFree
Rating4.2 (46 ratings) — better—
Positive reviews70.6% of reviews—
Number of ratings46 — better—
Update frequencyWeekly—
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.113.0 — better
Further details — not scored
Size112 MB261 MB
Age rating4+12+
DeveloperHeimdall Space Inc.Mojien Inc.

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
3 purchases

Mojien

Subscriptions2
  • Mojien Pro (Monthly)14 Days trial$7.991 Month
  • Mojien Pro (Annual)14 Days trial$54.991 Year
One-time1
  • Mojien Pro (Lifetime)$149.99

Questions

Is Gravity free?
Gravity is free to download, with in-app purchases available.
Is Mojien free?
Mojien is free to download, with in-app purchases available.
Do Gravity or Mojien have ads?
Neither Gravity nor Mojien shows ads.

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