Inku Help Center

Take the introductory lesson in your browser before you sign up, or download the iPhone app from the App Store. The iOS release requires iOS 18 or later and works on iPad in compatibility mode. A native Android app is not available yet.

Not to start. The iPhone app needs no account: your progress stays on that iPhone and does not sync in v1. On the web, your first lesson runs without an account, and the web app then asks you to create a web account so your web progress can be restored in another browser. Web and iPhone accounts and progress stay separate. You need an Inku account to buy Web Pro. On iPhone, your Apple account handles the purchase.

On the web, try the introductory lesson before signing up. Meet the sample cards with Next, then recall them with Again or Got it. Create an account to continue into the main web learner. Lessons teach new cards; Review brings back cards that are due.

On the web, a lesson shows its card count before you start. Review length depends on the cards that are due and how often you choose Again. Lessons and due reviews are separate; there is no fixed daily batch of five new cards.

Inku uses FSRS, a modern spaced-repetition algorithm, to schedule reviews from your answers and review history. Choose Again when you need more practice or Got it when you remember. Cards come back when they are due.

The web learner has no New Cards Per Day setting. Start a lesson when you want to learn new cards, and use Review for cards that are due.

On the web, use Too easy during a lesson or review for a card you already know. This marks it as learned and moves it out of regular review. It is separate from the Again and Got it recall controls.

On the web, Again brings the card back later in the review. Got it moves to the next card and schedules a future review. Flip reveals the answer without rating it. Choose the answer that matches what you remembered.

Both. On the web, lessons introduce new cards and then ask you to recall them. Review is a separate session for cards that are due. You do not need to learn new cards before reviewing.

Inku does not have a handwriting practice mode. Kana lessons use flashcards and audio.

Pricing last checked: October 29, 2026. Prices can vary by country, platform, checkout, tax, and promotion. Checkout shows any available trial, your eligibility, and when payment begins. Both plans renew until you cancel. Existing subscribers keep their current plan and price. Checkout confirms your price, tax and trial eligibility.

You can take the introductory lesson without an account. After it, studying in the web app needs Inku Pro. Checkout shows any available trial and when payment begins. Your account, settings, data export and account deletion stay available without Pro, and so do the charts and quizzes on this website. If Pro ends, your progress, decks and cards stay saved and open again with Pro.

iPhone: open Settings → your name → Subscriptions → Inku → Cancel Subscription. Web: open Profile → Subscription → Manage subscription, or email hello@inkujapanese.com if you cannot find the billing controls. Cancel on the store where you paid.

iPhone refunds go through Apple at reportaproblem.apple.com. For a web refund, email hello@inkujapanese.com. We cannot override a store decision.

No. Inku Pro subscriptions are not shared through Apple Family Sharing, on iPhone or on the web. Each person needs their own subscription.

You need an Inku account to buy Web Pro. To link an earlier guest purchase, log in to your verified account in the same browser, open Profile and select Connect purchase.

Inku teaches hiragana and katakana with audio (208 kana cards), 2,568 vocabulary cards across every JLPT level from N5 to N1 and everyday topic decks such as food, travel and shopping, and 407 phrases in three packs for casual, polite and travel Japanese. The kanji course has 960 kanji from N5 to N1. With Inku Pro, every deck is open from the start.

The main card library has bundled pronunciation audio recorded for the cards in that library. Smaller surfaces, including some sample sentences and niche phrases, fall back to your device's built-in Japanese voice when bundled audio isn't present.

The bundled main library audio uses ElevenLabs voice synthesis (Shizuka voice) recorded at build time and shipped inside the app. It is not your device's built-in TTS. System Japanese voice fallback is reserved for the small number of surfaces where bundled audio doesn't exist.

Yes. Each kanji lesson teaches five kanji with meanings, readings, a memory cue where helpful and a sample word, then moves them into review. Inku has 960 kanji from N5 to N1. That is smaller than a dedicated course such as WaniKani, which teaches about 2,000.

Yes. The current catalog includes vocabulary bundles for every JLPT level from N5 through N1. The JLPT does not publish official vocabulary lists, so these are curated study decks rather than claims of complete exam coverage.

Yes. On iPhone and the web, you can create your own card for a word you meet, save catalog words to your Library, and group cards into your own decks. Inku does not import decks from Anki or other apps.

In the iPhone app, Inku collects anonymous diagnostics only. Crash reports go to Sentry without personal data, and RevenueCat manages subscription state. Your learning data (every card grade, every interval, every progress mark) stays on your device and is never uploaded. If you create a web account, we store your email address, profile and web learning progress on our servers so it can be restored in another browser. The privacy policy lists what is stored.

Not in the iPhone app: learning progress stays on that iPhone, and there is no cloud sync in v1. A web account stores your web progress on our servers so it can be restored in another browser. Web progress and iPhone progress stay separate.

Not from the iPhone app yet: export is a roadmap item, and if you need it urgently, email hello@inkujapanese.com and we'll discuss your case. Web accounts can export their web learning data from the account screen.

No. There are no banner ads, interstitials, sponsored cards, or ad profiles.

Your learning data is removed with the app. Reinstalling starts a fresh deck. Your subscription continues unless you also cancel it through your app store.

On the web, check device volume, the browser tab's mute setting, and the card's audio control. If playback fails, reload the page and try again. On iPhone, check volume and the silent setting, then reopen the app if needed.

No. Inku's FSRS scheduler handles late reviews: overdue cards are rescheduled from your next answer, so a missed day does not reset your progress.

On the web, Review shows cards that are due, not every card you have learned. Your answers and review history set the next due date. Use a lesson to learn new cards while you wait for future reviews.

On the web, signed-in learners can use Report a problem with this card on catalog cards. You can also email hello@inkujapanese.com with the word, lesson, and what needs correcting.

Email hello@inkujapanese.com or use the contact page. Include whether you use the web learner or iPhone app and describe the problem.