Clozemaster vs SuperMemo
Clozemaster
clozemaster.com
SuperMemo
supermemo.comSide by side
| Figure | Clozemaster | SuperMemo |
|---|---|---|
| Price from | $5/mo | — |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | Yes | Yes |
| Plans published | 6 | 7 |
| Spec score · Language learning apps | 9.3 (#6) | 9.3 (#3) |
| API availability | A community developer documents internal REST endpoints under /api/v1/lp/ and requires browser cookies and a CSRF token, indicating no unauthenticated public API. | SuperMemo introduced an external API in 2026 that exposes its SM-20 spaced-repetition technology to developers. |
| Free plan | Yes | Yes |
| Languages offered | 75 | 25 |
| Licence | The service is proprietary: its terms grant limited personal access and prohibit copying, resale, automated access and reverse engineering. | SuperMemo’s commercial algorithm implementations remain proprietary trade secrets rather than open-source software. |
| Mobile apps | Yes | Yes |
| Offline lessons | Yes | Yes |
| Personalized review | Yes | Yes |
| Rating on Apple App Store | 4.8 out of 5 from 2K ratings | 4.2 out of 5 from 132 ratings. |
| Rating on Google Play | 4.6 out of 5 from 5.54K reviews | 3.8 out of 5 from 905 reviews. |
| Rating on Trustpilot | 3.8 out of 5 from 2 reviews | 3.7 out of 5 from 1 review. |
| Spaced repetition | Sentences move through default review intervals of same day, one day, 10 days, 30 days and 180 days, with Pro customization. | The scheduling algorithm selects individualized review intervals from a learner’s recall results and history. |
| Support | Users can submit account-linked questions, feedback, language requests and feature requests through the contact form. | Technical support is offered through a contact form and support email, with in-course problem reporting available. |
| What it does | Clozemaster teaches vocabulary by asking learners to supply missing words in thousands of contextual sentences. | SuperMemo provides language-learning courses and spaced-repetition study software for web and mobile users. |
Plans
Clozemaster
- FreeFree
- FreeFree
- Pro Monthly$8 a month
- Pro Yearly$60 a year
- Clozemaster Pro MonthlyPrice not published
- Clozemaster Pro YearlyPrice not published
SuperMemo
- Premium 1 month35.99 PLN a month
- Premium 12 months359 PLN a year
- API Starter€49 a month
- Single course59.90 PLN a year
- API Grow€89 a month
- API Scale€399 a month
- API EnterprisePriced on request
In their own words
Clozemaster
Clozemaster is a language-learning service built around fill-in-the-blank sentences in context. Learners answer by selecting a choice or typing the missing word, then review sentences again through spaced practice and word-frequency progress tracking. The service lists 75 languages, thousands of sentences in more than 50 languages, and over 170 language pairings. It runs on the web, Android, and iOS, with personalized review and offline lessons. Some sentences have ChatGPT explanations by default, while others can generate an explanation when requested. Sentence and translation data comes from Tatoeba’s user-curated, CC-BY dataset, which may contain errors. The Free plan costs nothing and allows 30 sentences per day.