Clozemaster
Clozemaster teaches vocabulary through fill-in-the-blank sentences, asking learners to supply a missing word by typing or choosing from options.
What Clozemaster is
Clozemaster teaches vocabulary through fill-in-the-blank sentences, asking learners to supply a missing word by typing or choosing from options. Sentences return for review, and learners can track progress by word frequency. The service offers 75 languages; its homepage describes thousands of sentences across more than 50 languages and over 170 language pairings. Clozemaster is available on the web, Android, and iOS, with offline lessons and personalized review. Some sentences have ChatGPT explanations by default, while learners can request explanations for others. Sentences and translations come from Tatoeba’s user-curated dataset, which is released under a CC-BY license; the FAQ notes that the content may contain errors that users can report in the game. The Free plan costs nothing and permits 30 sentences per day. Pro plans add unlimited sentence practice, listening practice, custom settings, advanced statistics, and offline mobile play. Listening practice is limited to supported languages and certain collections. Pro teachers can create and share collections of up to 50 sentences without requiring student accounts, and view answer results.
Good
- Practice uses sentences in context
- Available on web, Android, and iOS
- Offers personalized review and offline lessons
- Free plan allows 30 sentences per day
Watch out
- Free plan limits practice to 30 sentences daily
- Listening practice covers supported languages and collections only
- Sentence and translation content may contain errors
Who it suits
Clozemaster suits learners who want vocabulary practice in sentence context across web and mobile devices. Pro may suit learners seeking unlimited practice and offline mobile play, or teachers who want to share collections and review results.
Verdict
Clozemaster centers practice on sentence-based vocabulary review, with a free daily allowance and additional features in Pro. Check the listening limits and the user-curated content caveat when deciding whether it fits your learning routine.
Plans and prices
From Clozemaster's own pricing page, checked 15 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | 30 sentences per day · web and mobile play |
| Pro Monthly | $8 a month | unlimited sentences · advanced statistics · sentence search and favorites · custom review settings · listening practice · offline mobile play · recurring billing; cancel anytime |
| Pro Yearly | $60 a year | unlimited sentences · advanced statistics · sentence search and favorites · custom review settings · listening practice · offline mobile play · recurring billing; 30-day money-back guarantee |
| Clozemaster Pro Monthly | — | Unlimited sentence practice · advanced statistics · listening practice for supported languages and collections · Recurring billing; cancel anytime |
| Clozemaster Pro Yearly | — | Unlimited sentence practice · advanced statistics · listening practice for supported languages and collections · 30-day money-back guarantee · Recurring billing; cancel anytime |
The facts
Each one read from Clozemaster's own pages, with the date it was checked.
Money
- AI explanations
- Grammar and contextual explanations are supplied by stored or on-demand ChatGPT-generated responses that users can report for correction.checked 15 Oct 2026
- Free plan
- Yeschecked 20 Sep 2026
What it does
- 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.checked 15 Oct 2026
- API documentation request
- A 2025 forum post asks for an OpenAPI specification for third-party clients, showing that official public API documentation was not readily available there.checked 15 Oct 2026
- Content limitation
- The FAQ notes that sentences and translations come from a user-curated dataset and may contain errors, which users can report in the game.checked 12 Oct 2026
- Data deletion
- Users can delete their account, after which Clozemaster says it retains aggregate or anonymous activity data.checked 12 Oct 2026
- Documentation
- The help center contains articles covering subscriptions, offline play, TTS voices, CSV or TSV collection uploads, review intervals and account deletion.checked 15 Oct 2026
- Frequency ordering
- Clozemaster selects the least common word in a sentence from the language's most frequent 10,000 words when frequency data exists.checked 15 Oct 2026
- Language coverage
- The service advertises more than 50 languages and over 170 language pairings on its home page.checked 15 Oct 2026
- Languages offered
- 75checked 20 Sep 2026
- Learning method
- Clozemaster teaches vocabulary through fill-in-the-blank exercises using sentences in context.checked 12 Oct 2026
- Licence
- The service is proprietary: its terms grant limited personal access and prohibit copying, resale, automated access and reverse engineering.checked 15 Oct 2026
- Limit: course structure
- Think in Italian rated Clozemaster as strong for contextual vocabulary but lacking structured progression, grammar teaching and speaking practice.checked 15 Oct 2026
- Limit: current bugs
- The bug-report index lists 2026 reports about broken explanations, Android collection playback, wiped iOS review queues and crashes.checked 15 Oct 2026
- Limit: interface
- FluentU found the dashboard visually cluttered and said simple icons were difficult to interpret at first.checked 15 Oct 2026
- Limit: sentence quality
- The official FAQ warns that Tatoeba sentences and translations are user-curated, so errors can occur.checked 15 Oct 2026
- Limit: speech recognition
- A forum bug report records Android speaking mode failing when the device could not bind to a speech-recognition service.checked 15 Oct 2026
- Listening limit
- Pro listening practice is available for over 30 languages and only for Fast Track, Most Common Words, and Grammar Challenge collections.checked 12 Oct 2026
- Notable 2026 change
- The Clozemaster forum shows an October 9, 2026 discussion about new review logic and interface changes, alongside user requests to retain the older workflow.checked 15 Oct 2026
The company
- Company
- The terms identify Language Innovation LLC as the entity that owns and operates Clozemaster websites, mobile apps, and related services.checked 12 Oct 2026
- Company database profile
- Crunchbase describes Clozemaster as a private Somerville company with 1–10 employees.checked 15 Oct 2026
- Company legal name
- The terms identify Language Innovation LLC as the owner and operator of Clozemaster websites, apps and services.checked 15 Oct 2026
- Company profile
- LinkedIn lists Clozemaster as self-owned software development with one employee and headquarters in Somerville, Massachusetts.checked 15 Oct 2026
Where it runs
- Mobile apps
- Yeschecked 20 Sep 2026
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