Inku vs Duolingo
Inku vs Duolingo for Japanese
Duolingo is the giant gamified language app. Inku is the calm iPhone flashcard app. Different tools for different temperaments.
How does Inku compare to Duolingo?
Duolingo is probably the app that got you thinking about Japanese. It is free to start, broad, and built around daily motivation. Inku exists for learners who want a calmer Japanese-only flashcard app with a shorter review loop. Here is the honest comparison.
When is Inku the better pick?
- You want to actually speak Japanese in 6 months. Inku is built around spaced repetition with real vocabulary and audio-supported review. Six months with Inku takes you through hiragana, katakana, and 515 N5 cards. Six months of Duolingo Japanese is mostly about owning a streak.
- You are an adult who finds gamification exhausting. No fireworks, no leagues, no mascot giving you a guilt trip. Inku opens, presents today's cards, and closes. The whole thing is built for people who feel patronized by loud streak pressure.
- You want offline access and privacy. Inku does not require an account, and learning progress is stored on your iPhone. Duolingo is an online account-based app with ads on the free tier.
- You care about authentic pronunciation. Inku bundles audio for the main card library and keeps listening inside the review flow. Duolingo also has audio, but it is part of a broader lesson system.
When is Duolingo the better pick?
- You want free and do not plan to subscribe. Duolingo has a real free tier. Inku is subscription-first with a 7-day trial. If budget is the constraint, Duolingo wins.
- You want multiple languages in one app. Duolingo teaches 40+ languages. Inku is Japanese-only and plans to stay that way.
- You like the motivation of a big community. Duolingo has leaderboards, leagues, and millions of users. Inku is a solo tool with no social features.
Feature-by-feature
Sources and pricing
Pricing last checked: April 28, 2026. Prices can vary by country, platform, checkout, tax, and promotion.
| Feature | Inku | Duolingo | Best fit |
|---|---|---|---|
| Free tier | 7-day trial only | Free with ads | |
| Pronunciation audio | Bundled library audio | Included in lessons | |
| Spaced repetition | FSRS algorithm | Basic interval | |
| Hiragana + katakana | Full guide + drill | Covered in early lessons | |
| Offline mode | Core review content on-device | Plan-dependent | |
| Account required | No | Yes | |
| Languages supported | Japanese | 40+ | |
| Gamification | Quiet progress | Heavy | |
| Ads | None | Yes (free tier) | |
| Pricing | $49.99/yr or $3.99/mo | paid Super plan |
Inku's favor · Duolingo's favor · roughly even
The honest take
Duolingo is not a bad app. It is a good app built for mass-market retention, and that retention comes from gamification. If you thrive on streaks and leaderboards, it can be a genuinely fun way to spend 10 minutes a day. If you find those things exhausting (or, like many people, shame-inducing), you are the exact person Inku was built for.
Verdict
Use Duolingo if: you want free, multiple languages, and enjoy gamification. Use Inku if: you are a serious adult learner who wants to actually produce Japanese and is willing to pay for a calmer experience.
If you have tried Duolingo for Japanese and want a quieter way to review kana, vocabulary, and phrases, Inku is worth a 7-day trial.
How we research this
Inku is not affiliated with Duolingo. Every claim here draws on public product pages, app store listings, and help docs, linked under each section and dated where pricing is involved (last checked April 28, 2026). For full transparency: Inku audio is professionally synthesized rather than human recorded, and we never publish fabricated reviews or ratings. Found an error? Email app@inkujapanese.com and we will fix it.
Common questions
Can I use Inku and Duolingo at the same time?+
You can, but most people find it counterproductive. The two apps have different review schedules, so you double your time commitment without doubling your progress. Most learners who switch choose one.
Does Inku have a streak feature?+
Yes. Inku has streak and progress tracking, but it uses a calm tone and ink drops so the habit feels soft.
How does Duolingo's TTS compare to Inku's audio?+
Duolingo includes audio inside its lessons. Inku bundles audio for the main card library and keeps listening inside each review.
Related comparisons
Looking at this as a switch rather than a head-to-head? See the best Duolingo alternative for Japanese.
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Or zoom out: the best Japanese flashcard apps roundup, all comparisons, and all alternatives. New to Japanese? Start with the full learning roadmap.