Comparison

Inku vs Nihongo Flow

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

Head to head
About

Inku

Master Japanese vocabulary, kanji, and kana with a spaced repetition system. Build custom decks, practice reading with furigana and romaji support, and track your progress towards JLPT exams. Learn at your own pace with guided lessons and pronunciation audio.

Highlights
  • Spaced repetition system
  • JLPT vocabulary (N5-N1)
  • Kanji lessons (400+)
  • Hiragana and Katakana practice
  • Pronunciation audio
  • Custom flashcard decks
Read full description

Japanese flashcards are easy to start. Remembering what you studied is the hard part. Inku turns short study sessions into Japanese that sticks. Learn a small set, review it before it fades, and return when the cards are due. Japanese spaced repetition stays simple: difficult words return sooner, familiar words less often, and you always know what to study next. Building beginner Japanese vocabulary and trying to learn hiragana? Preparing for JLPT N5, JLPT N3, or JLPT N2? Returning to Japanese after a break? Inku connects each stage: kana practice becomes reading practice, new vocabulary becomes Japanese flashcards, and every review moves your study forward. As your Japanese vocabulary grows, Kanji stops feeling like a wall of disconnected characters. Learn Kanji in context through readings, meanings, memory cues where helpful, sample words, and related vocabulary. Guided lessons cover 400+ Kanji across N5-N3, then move each character into the same flashcard review as your Japanese study. Furigana reading support connects Kanji to kana, pronunciation audio lets you hear each word, and Japanese romaji reading support gives beginners another bridge. As readings become familiar, you rely less on hints and more on memory. When you find a useful word in class, manga, or daily life, keep it. Build custom decks from Inku's library, or create original Japanese flashcards with meanings, romaji, explanations, and personal notes. Each card returns alongside your review. Whether you are studying Japanese for JLPT vocabulary or saving a Japanese phrase from a conversation, the same system keeps Japanese vocabulary study connected to the language you encounter. From your first hiragana to JLPT vocabulary, Inku gives you one place to build a strong Japanese foundation: • All 92 core hiragana and katakana characters • 2,000+ Japanese words and phrases • JLPT vocabulary across N5, N4, N3, N2, and N1 • 400+ Kanji through focused lessons and review • Japanese pronunciation audio for words and phrases • Furigana, kana, and romaji reading support • Custom flashcards and decks • Spaced review, mastery, and study progress There are no ads, no account to create, and no endless feed. Your progress stays on your iPhone. Open Inku, study the next useful cards, and keep your Japanese practice moving. Inku is free to download. Inku Pro is an auto-renewable subscription purchased through the App Store. It unlocks the complete study library, Kanji lessons, custom decks, pronunciation audio, reviews, and progress tools. Manage or cancel anytime in Settings. Privacy Policy: https://inkujapanese.com/privacy Terms of Use: https://inkujapanese.com/terms

About

Nihongo Flow

Read full description

Nihongo Flow teaches you hiragana, katakana and kanji, builds a vocabulary that sticks, and shows you how Japanese sentences work. A few minutes a day is enough. Explanations are in English or German. VOCABULARY THAT STICKS • Your learning path takes you through the most common words: 2,000, 4,000 or more than 5,800, you choose. • Every word comes back just before you would forget it (spaced repetition). • Practice with flashcards, multiple choice or romaji typing, or say the word out loud and Apple speech recognition checks your pronunciation. • The memory heatmap shows which words are solid and which are fading. HIRAGANA, KATAKANA, KANJI • Hiragana and katakana with all basic and voiced characters, plus 40 N5 kanji with on and kun readings. Quizzes and typing drills in rounds of 10. • Handwriting (Premium): write kana and kanji with your finger and get an instant check of stroke count and size. SENTENCES AND GRAMMAR • Grammar from N5 to N1: 52 lessons and a level check for your grammar level. • Sentence Blocks: see how a sentence snaps together from colored blocks, build your own from words you've learned, and stack verb endings from polite to passive. MORE PATHS • Baby Path: picture first, then the word, the way toddlers learn. • Topic Path: nature, seasons, home and more. • Slang & Colloquial: how people in Japan really talk, with the textbook version for comparison. Includes crude expressions, clearly marked. • Business Japanese & Keigo: 463 forms and terms in 29 chapters. • Immersion: short texts on anime, travel, daily life, news and business. Tap a word to add it to your vocabulary. • Hokkaidō Densetsu (Premium): travel across Hokkaidō in 18 stations, with culture cards, Ainu culture, a collector's album and a dice race against rivals. SENSEI: AI FEATURES FOR AGES 16+ • Chat with Sensei in Japanese or English, as a friendly teacher, an anime character or a business mentor. • Voice call with Sensei (Ultra Maxx): you speak, Sensei listens and answers out loud. • Plus "Teacher explains", example sentences, the Sentence Puzzle, an AI check for your sentences, text correction and "Your level today". • AI features use Claude by Anthropic. They are available from age 16, and only after you agree once. You can withdraw consent anytime in Settings, and you can report any AI answer. Everything else works without AI. KEEP GOING Streaks, levels and XP, "What to learn today?", a Japanese proverb every day and your own avatar. No ads. Speak Japanese? Settings > Course also offers a German course with a Japanese interface. WITHOUT A SUBSCRIPTION OR WITH PREMIUM You need an account with email and password. Without a subscription you learn with energy: each answer uses one point, and energy refills over time. AI features have a daily limit. "Nihongo Flow Premium" gives you unlimited energy, all AI features with no daily limit, handwriting practice and Hokkaidō Densetsu. "Nihongo Flow Ultra Maxx" is Premium plus the voice call with Sensei, up to 15 minutes a day. SUBSCRIPTION TERMS • "Nihongo Flow Premium" is an auto-renewable subscription, billed monthly (1 month) or yearly (1 year). Prices vary by country and are shown in the app before you buy. • You can try Premium free for 3 days, once per Apple Account. Unless you cancel at least 24 hours before the trial ends, it converts to the plan you chose. • Payment is charged to your Apple Account when you confirm the purchase or, with a trial, when the trial ends. • The subscription renews automatically for another month or year unless you cancel at least 24 hours before the end of the current period. Renewal is charged within the 24 hours before the period ends. • You can manage and cancel it anytime in your Apple Account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://nihongo-flow.app/privacy.html

Screenshots

Inku4 screens
Nihongo Flow4 screens

Verdict

The call

The clearest difference is update cadence: Nihongo Flow at every 2 days against Inku's monthly. Nihongo Flow also leads on iOS requirement (15.0 vs 18.0). 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. Inku sells 2 in-app purchases, starting at $3.99 per 7 days and Nihongo Flow sells 4 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Inku ships an update monthly, Nihongo Flow every 2 days. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 7 level
Inku versus Nihongo Flow: the parameters behind the verdict, then further details
ParameterInkuNihongo Flow
PriceFreeFree
Rating2.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyMonthlyEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhoneiPhone, iPod — better
Requires iOS18.015.0 — better
Further details — not scored
Size168 MB91 MB
Age rating4+12+
DeveloperGia HuaLEONARD SCHAPER

In-app purchases

2 purchases

Inku

Subscriptions2
  • Inku Pro Weekly7 Days trial$3.997 Days
  • Inku Pro Annual7 Days trial$49.991 Year
4 purchases

Nihongo Flow

Subscriptions4
  • Nihongo Flow Premium (Monthly)3 Days trial$6.991 Month
  • Nihongo Flow Ultra Maxx$29.991 Month
  • Nihongo Flow Premium (Yearly)3 Days trial$79.991 Year
Show 1 more
  • Nihongo Flow Ultra Maxx$299.991 Year

Questions

Is Inku free?
Inku is free to download, with in-app purchases available.
Is Nihongo Flow free?
Nihongo Flow is free to download, with in-app purchases available.
Do Inku or Nihongo Flow have ads?
Neither Inku nor Nihongo Flow shows ads.
Which is updated more often, Inku or Nihongo Flow?
Inku ships an update monthly, and Nihongo Flow every 2 days. Most recently, Inku was updated on October 10, 2026 and Nihongo Flow on October 24, 2026.

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