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Clozemaster
What it is
Clozemaster is a freemium language-learning service for practicing vocabulary through fill-in-the-blank sentences in context. Learners choose a missing word from multiple choices or type it, then sentences return for spaced review. Progress can be tracked by word frequency. The service offers 75 languages; its homepage describes thousands of sentences across more than 50 languages and over 170 language pairings. It runs on Android, iOS, and the web, with personalized review and offline lessons. Some sentences include ChatGPT explanations, while others can generate one when Explain is selected. The Free plan is free and allows 30 sentences per day. Pro listening covers supported languages and specified collections. Pro teachers can create collections of up to 50 sentences, share them without student accounts, and view answer results. Content comes from Tatoeba’s user-curated, CC-BY dataset, which may contain errors.
For and against
For
- Offers 75 languages and over 170 language pairings
- Uses sentence context and spaced review
- Available on Android, iOS, and web
- Includes personalized review and offline lessons
- Free plan provides 30 sentences per day
Against
- Free plan limits practice to 30 sentences daily
- User-curated sentences and translations may contain errors
- Listening is limited to supported collections and languages
The verdict
Clozemaster centers practice on repeated, contextual sentence work rather than isolated word lists. Its free tier supports a daily routine, while Pro adds broader practice controls and statistics.
Who it suits
It suits learners who want contextual vocabulary practice across web and mobile devices. Teachers with Pro may also use shared collections and answer-result viewing.
Plans and prices
Free
30 sentences per day · web and mobile play
Read 15 Oct 2026 · clozemaster.com
Pro Monthly
unlimited sentences · advanced statistics · sentence search and favorites · custom review settings
Read 15 Oct 2026 · staging.clozemaster.com
Pro Yearly
unlimited sentences · advanced statistics · sentence search and favorites · custom review settings
Read 15 Oct 2026 · staging.clozemaster.com
Clozemaster Pro Monthly
Unlimited sentence practice · advanced statistics · listening practice for supported languages and collections
Read 12 Oct 2026 · api.clozemaster.com
Clozemaster Pro Yearly
Unlimited sentence practice · advanced statistics · listening practice for supported languages and collections · 30-day money-back guarantee
Read 12 Oct 2026 · api.clozemaster.com
On the record
- AI explanations
- Grammar and contextual explanations are supplied by stored or on-demand ChatGPT-generated responses that users can report for correction.api.clozemaster.com · read 15 Oct 2026
- 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.github.com · read 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.forum.clozemaster.com · read 15 Oct 2026
- Company
- The terms identify Language Innovation LLC as the entity that owns and operates Clozemaster websites, mobile apps, and related services.clozemaster.com · read 12 Oct 2026
- Company database profile
- Crunchbase describes Clozemaster as a private Somerville company with 1–10 employees.crunchbase.com · read 15 Oct 2026
- Company legal name
- The terms identify Language Innovation LLC as the owner and operator of Clozemaster websites, apps and services.api.clozemaster.com · read 15 Oct 2026
- Company profile
- LinkedIn lists Clozemaster as self-owned software development with one employee and headquarters in Somerville, Massachusetts.linkedin.com · read 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.api.clozemaster.com · read 12 Oct 2026
- Data deletion
- Users can delete their account, after which Clozemaster says it retains aggregate or anonymous activity data.clozemaster.com · read 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.docs.clozemaster.com · read 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.api.clozemaster.com · read 15 Oct 2026
- Language coverage
- The service advertises more than 50 languages and over 170 language pairings on its home page.clozemaster.com · read 15 Oct 2026
- Languages offered
- 75clozemaster.com · read 20 Sep 2026
- Learning method
- Clozemaster teaches vocabulary through fill-in-the-blank exercises using sentences in context.clozemaster.com · read 12 Oct 2026
- Licence
- The service is proprietary: its terms grant limited personal access and prohibit copying, resale, automated access and reverse engineering.api.clozemaster.com · read 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.thinkinitalian.com · read 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.forum.clozemaster.com · read 15 Oct 2026
- Limit: interface
- FluentU found the dashboard visually cluttered and said simple icons were difficult to interpret at first.fluentu.com · read 15 Oct 2026
