Comprehensible Input

App profile

ReadLang

Web-based language-learning tool centered on reading, inline translation, vocabulary saving, and flashcard review.

Visit official websiteFacts last verified August 24, 2026

Best for

  • Simple Reading
  • Browser Reading
  • Lightweight Ci
  • Bring Your Own Content

Pricing

Free plan
✓Supported
Monthly
$6.00/month
Annual
$48.00/year
  • Free word translations, text uploads, and flashcard practice are unlimited.
  • The free plan limits phrases to 6 words, includes 10 phrase translations and 10 context explanations per day, and highlights up to 200 words in total.
  • Premium raises the phrase length to 12 words, removes the phrase-translation, context-explanation, and word-highlighting limits, and includes 10 hours of audio storage.
  • Premium Plus costs $15 per month or $120 per year, includes 200 hours of audio storage, and uses GPT-4o instead of GPT-4o mini.

Availability

Platforms

Web✓Supported
iOS—Unsupported
Android—Unsupported
Browser extension✓Supported
Self-hosted / local—Unsupported

Factual overview

Feature summary

Browse ReadLang’s capabilities by category, or compare the same fields across every researched app.

Content & discovery

Built-in content library
✓Supported
Content discovery
✓Supported
News & articles
—Unsupported
Books
✓Supported
YouTube / video library
—Unsupported
Podcast library & discovery
—Unsupported
Import own content
✓Supported
Import webpages
✓Supported

Reading & books

Text reading mode
Continuous
Book reading mode
Continuous
EPUB import
✓Supported
Dedicated book reader
—Unsupported
Preserves original book structure
—Unsupported
Preserves chapters
—Unsupported
Preserves formatting
—Unsupported
Preserves images
—Unsupported
Book navigation / TOC
—Unsupported
Reading-position sync
—Unsupported
TTS / read aloud
✓Supported

Video & audio

YouTube dual subtitles
—Unsupported
Netflix dual subtitles
—Unsupported
Audio import
✓Supported
Automatic transcription
✓Supported
Synchronized transcript / highlighting
✓Supported

Translation & comprehension

Word translation
✓Supported
Context-aware word translation
✓Supported
Sentence translation
Limited
Multiple dictionaries
✓Supported
AI explanations
✓Supported
Text simplification
✓Supported
Base-form / lemma lookup
—Unsupported

Vocabulary & review

Save words
✓Supported
Learning / known status
✓Supported
Separate meanings per word
—Unsupported
Seen / encounter count
—Unsupported
Example sentences
✓Supported
SRS flashcards
✓Supported
Multiple / custom decks
—Unsupported
Vocabulary import
✓Supported
Export saved words
✓Supported
Export seen words
—Unsupported
Export examples / metadata
✓Supported

Learning & guidance

Structured courses / lessons
—Unsupported
Grammar roadmap
—Unsupported
AI tutor
✓Supported
Human tutors
—Unsupported
Speaking practice
—Unsupported
Writing practice
✓Supported
Pronunciation practice
—Unsupported

Progress & motivation

Daily streak
✓Supported
Daily goal
—Unsupported
Learner level
—Unsupported
Reading statistics
✓Supported
Listening statistics
—Unsupported
Achievements
—Unsupported
Leaderboards
—Unsupported

Compare ReadLang with other apps

Context matters

Notes behind the cells

Concise cells make scanning easy. These notes preserve the important caveats from each app record.

ReadLang

  • Regional variants and dialects are supported for voices only.
  • The built-in library includes song lyrics, but not a video or podcast library.
  • Sentence translation is limited to phrases of up to 12 words on paid plans.
  • EPUB text is extracted into ReadLang's reader. Chapter headings may be detected, but the original EPUB chapter structure is not preserved.
  • Text and book reading are paginated rather than continuous; sentence mode is not supported.
  • Reading audio and TTS read-aloud are available.
  • Video tools include interactive captions, transcript view, vocabulary saving, automatic transcription, and synchronized highlighting.
  • Subtitle navigation has not yet been verified.
  • Vocabulary is tracked automatically, and TTS is available for words and examples.
  • Saved vocabulary and associated examples and metadata can be exported, including to Anki.
  • Community decks, AI-generated word forms, examples and images, and Duolingo vocabulary import are not supported.
  • Grammar guides, lesson building, and lesson generation are not supported.
  • The browser extension can import webpages and translate selected text, but does not translate words automatically while browsing.
  • YouTube caption import, YouTube dual captions, and Netflix integration are not supported by the extension.
  • A mobile web app is available despite the lack of native iOS and Android apps.

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Alternatives to ReadLang

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LuteFree, open-source, self-hosted tool for learning languages through reading imported texts and tracking vocabulary.DuoNinjaComprehensible-input platform combining real-world content with vocabulary review, book reading, video learning, and structured lessons.LingQComprehensible-input platform built around reading and listening to a large library of real-world content and user imports.

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