Sakugo
Sakugo: A free, web-based Japanese writing app with corrections, vocabulary tracking, and a daily limit. Ranked #57 of 63 in Japanese Learning Apps by our editors (3.6/10); pricing: Free plan; best for learners practicing written Japanese with feedback.
At a glance
- Editor score3.6 / 10
- PricingFree plan
- Best forLearners practicing written Japanese with feedback
- Free planYes
- Paid fromFree
- Study focusWriting
- Facts checked22 Oct 2026
Where it wins
- AI feedback includes ratings, comments, inline corrections, and model translations.
- Spaced-repetition tracking supports vocabulary mastery.
- Genki- and JLPT-aligned paths connect writing practice with structured study.
Where it doesn't
- Sentence evaluations are limited to about 20 per day.
- Available on the web only.
- Does not offer speaking practice.
Our verdict on Sakugo
Sakugo is a web app for Japanese learners who want to produce sentences, rather than focus on speaking practice. It presents English prompts for translation into Japanese, then provides AI-generated ratings, comments, inline corrections, and model translations. The format gives learners feedback on their written output while they work through individual prompts. Vocabulary study is part of the same learning experience: spaced-repetition mastery tracking accompanies definitions, cultural notes, example sentences, and furigana. Genki- and JLPT-aligned paths and JLPT vocabulary lists offer structure for learners following either course material or exam-oriented study.
The writing-feedback loop is Sakugo's clearest fit. Learners can compare their typed Japanese with corrections and a model translation, while vocabulary pages add context beyond a bare definition. Its curriculum links sentence production to vocabulary review and established Genki- and JLPT-aligned paths, making it more suited to ongoing written study than a standalone translation utility. The app is currently in beta and free for beta testers, with a daily quota of about 20 sentence evaluations. That limit may suit a regular, bounded practice routine, but learners seeking frequent or high-volume correction may find it restrictive.
Sakugo is web-only and does not provide speaking practice, so learners looking for pronunciation work or a mobile app should choose a product that covers those needs. It is described as a one-person beta project, and the documentation says subscription plans with higher limits and additional features are in development. For now, its appeal is the combination of typed production, AI feedback, and vocabulary tracking at no cost to beta testers. It is a focused option for solo learners who want written Japanese practice; it is less suitable for learners who need speaking exercises or more than the daily evaluation allowance.
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Sakugo pricing
Sakugo fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Study focus | Writing |
| Speaking practice | No |
| Writing practice | Yes |
| Offline access | Not verified |
| Platforms | web |
| Deployment | Cloud |
| Platforms | Web |
| Support | Email, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | sakugo.app |
| Facts checked | 22 Oct 2026 |
Alternatives to Sakugo
- DuolingoA broad free Japanese course with placement, personalized review, stories, and mobile access.9.4
- IRODORI Japanese Online CourseA free, self-paced Japanese course focused on everyday life and work in Japan.9.3
- Marugoto Japanese Online CourseInteractive Japanese self-study with tutor-supported courses, live lessons, and assignment correction.9.2
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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