Clozemaster

What Clozemaster does

Clozemaster, operated by Language Innovation LLC (a privately held US LLC), is a gamified language-learning platform that teaches vocabulary through cloze (fill-in-the-blank) sentences presented in real linguistic context. The product covers 50+ languages and 170+ language pairings and layers fill-in-the-blank exercises with a spaced repetition system, multiple input modes (multiple choice, text input, Cloze-Reading for longer texts), listening practice with audio for 30+ languages, and word-frequency-based sentence collections. Native-speaker-authored sentence content is a differentiator, particularly for less common languages where competitors lack coverage. Translations are provided via Google Translate.

The business operates on a freemium model: the core product is free with a 30 sentences-per-day ceiling, while Clozemaster Pro is a recurring subscription that unlocks unlimited play, unlimited listening, offline mode, the Cloze-Reading mode, advanced progress statistics, and customizable review intervals. Pricing is exposed as monthly and annual subscriptions with a 30-day money-back guarantee on annual plans. Distribution is product-led across web and native iOS/Android applications, marketed through app stores, organic SEO on per-language landing pages, an affiliate program, and user testimonials. Customer segments are individual self-motivated language learners (primary) and intermediate-to-advanced learners using Clozemaster as a supplement to formal courses (secondary). An emerging teaching/educator page suggests nascent institutional interest.

The company is bootstrapped (no disclosed funding, no institutional investors), privately held, and operates without a disclosed management team in the available record. Source data references hundreds of thousands of active users and an active app footprint on both major mobile stores, but discloses no revenue, headcount, or milestone timeline, which limits any quantitative growth assessment.

Name

Clozemaster

Legal name

Language Innovation LLC

Website

https://clozemaster.com

Company type

Private

Operating status

Operating

Headcount range

1–10 employees

Short description

Clozemaster (operated by Language Innovation LLC) is a freemium language-learning platform offering fill-in-the-blank, context-based vocabulary practice across 50+ languages and 170+ pairings for individual self-motivated language learners, monetizing through a recurring Pro subscription.

Ownership category

akta.pro rank

Product category

Language Learning Software

NAICS

Language Schools (611630), Language Schools (61163), Educational Support Services (61171)

SIC

Services-Prepackaged Software (7372), Services-Educational Services (8200)

akta.pro primary industry

AI-Powered Language Tutors, Chatbots & Speaking Practice Tools (EDAFAOAC)

Keywords

• Language learning software
• Vocabulary acquisition
• Spaced repetition learning
• Cloze test exercises
• Mobile education apps

Headquarters

HQ city

Somerville

HQ country

United States

HQ region

North America

Markets served

GTM type

B2C

Offering type

Software

Cost components

Technology or R&D, Infrastructure, Operations, Marketing or Sales, Personnel

Revenue model

1. Freemium Core Product: Free tier allows users to play up to 30 sentences per day with access to all 50+ languages and core vocabulary learning features. This drives user acquisition and organic growth.
2. Clozemaster Pro Subscription: Pro subscription unlocks unlimited play, unlimited listening practice for 30+ languages, access to all languages, offline mode, Cloze-Reading feature, advanced stats (review forecast, progress tracking), and customizable settings. Available as monthly or yearly recurring billing with 30-day money back guarantee for yearly plans.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

Clozemaster is a gamified language learning platform that teaches vocabulary through cloze (fill-in-the-blank) exercises drawn from real sentences, covering 50+ languages and 170+ language pairings. A free tier allows up to 30 sentences per day with access to core features, while a paid Pro subscription unlocks unlimited play, unlimited listening practice, offline mode, Cloze-Reading, advanced stats, and customizable review settings. The product is available on web, iOS, and Android and combines spaced repetition, word frequency organization, and AI-driven grammar explanations to drive vocabulary retention.

Product overview

Clozemaster is a gamified language learning platform offering vocabulary acquisition through context-based fill-in-the-blank (cloze) sentences. The core product is a free tier providing access to sentence practice across 50+ languages with limited daily sentences. Clozemaster Pro is the premium subscription add-on that unlocks unlimited practice, listening features, offline mode, and advanced analytics. The platform is accessible via web and mobile apps (iOS/Android) and organizes content into collections organized by word frequency (100, 500, 1000, 2000, etc. most common words) and grammar categories.

Differentiator

Problem solved

Functional benefit

Products and services

• Clozemaster (Free) A gamified language learning app using cloze (fill-in-the-blank) exercises to teach vocabulary in context across 50+ languages, with multiple choice and text input modes, spaced repetition, and progress tracking through word frequency-based sentence collections. Targeted at individual language learners seeking to build vocabulary and fluency through free, self-serve practice.
• Clozemaster Pro Premium subscription that unlocks unlimited play (free accounts limited to 30 sentences per day), unlimited listening practice for 30+ languages, offline mode, Cloze-Reading for longer texts, sentence search, advanced stats (review forecast, progress tracking), and customizable review intervals. Available as monthly or yearly recurring billing with a 30-day money back guarantee. Targeted at individual language learners wanting advanced features and unlimited practice.

Quantifiable outcome

• Vocabulary retention through context-based learning
• +2 more outcomes

Named customers9 records

Segments2 records

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Duolingo: Largest freemium gamified language learning platform, serving global consumers across dozens of languages with a subscription tier (Super/Plus). Direct competitor for Clozemaster's vocabulary and gamified practice use case, though Duolingo is broader in scope (beginner-agnostic, full curriculum) and far larger in user base.
• Babbel: Subscription language learning platform focused on conversational proficiency across ~14 languages. Competes with Clozemaster for the same intermediate learner segment, with a heavier emphasis on guided lessons and structured curriculum versus Clozemaster's cloze-based vocabulary drilling.
• Memrise: Vocabulary-first language learning platform using spaced repetition and user/video content, with a Pro subscription tier. Closely comparable to Clozemaster on the SRS + vocabulary positioning, though Memrise emphasizes real-video content while Clozemaster emphasizes real-sentence cloze.
• Lingvist: AI-driven vocabulary learning platform that adapts to user proficiency using statistical models. Overlaps with Clozemaster on AI-personalized vocabulary acquisition and cloze-style exercises, though Lingvist focuses on fewer languages and a more analytics-driven UX.
• Busuu: Subscription language learning platform with structured courses and community feedback from native speakers. Competes with Clozemaster for the same paid-language-learner segment, with a broader curriculum but less depth on vocabulary drilling.
• Quizlet: User-generated flashcard and study platform widely used for language vocabulary learning with subscription (Quizlet Plus). Competes for the same vocabulary-acquisition use case through flashcards and study modes, though it spans all academic subjects, not just language.
• Drops: Visual, gamified vocabulary learning app with a freemium + premium subscription model across 40+ languages. Directly comparable to Clozemaster on gamified vocabulary acquisition and freemium conversion mechanics, though Drops emphasizes visual word association over contextual sentences.
• Anki: Open-source flashcard application using spaced repetition, widely used by language learners to build vocabulary. Closely comparable technology and pedagogy to Clozemaster, though Anki is non-commercial/user-generated content and lacks the curated cloze sentence library and gamification.

Broad incumbents

• Pimsleur: Audio-based language learning subscription with decades of brand recognition, focused on conversational proficiency. Adjacent competitor for the same intermediate learner willing to pay for subscription language tools, with a fundamentally different audio-driven pedagogy.
• Rosetta Stone: Established, long-standing language learning subscription product with immersive methodology across ~25 languages. Serves an overlapping intermediate-learner audience but positions as a full curriculum product rather than a vocabulary supplement.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/clozemaster

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Clozemaster