Subturtle

Subturtle is a browser extension that lets users translate and save phrases from web pages, YouTube, and Netflix to practice speaking with an AI coach.

Subturtle helps people who read and watch English every day transition to speaking it. Users select text on any web page or hover over YouTube and Netflix subtitles to see meanings in context across 110 languages. The extension saves phrases along with their original sentences and scenes, building personalized review bundles. A smart review system brings phrases back after 1, 2, 4, 8, and 16 days to strengthen memory. Finally, users practice speaking out loud with a real-time AI voice coach that uses the saved phrases. The tool is designed for daily web readers, series watchers, and shy speakers who want a patient practice partner.

Subturtle at a glance

Best for: Student, Writer
Runs on: Chrome extension, Web
Pricing: Starter Free; Reader £4.49/month; Learner £10.99/month with 3-day trial; Coach £24.99/month
Released: October 2026
Category: AI research tool
Website: subturtle.app

Key features

Hover to translate YouTube and Netflix subtitles
Select text on any web page for context and meaning
Smart review flashcards spaced over 1 to 16 days
Real-time AI voice coach for speaking practice
Explanations available in 110 languages
Text chat with the AI coach as an alternative
Automatic saving of phrases with original sentences and scenes

Use it for

Saving phrases from news and Reddit articles
Building a phrase bank from Netflix series
Practicing tech talks and documentation vocabulary
Preparing for interviews using custom phrase bundles

Alternatives to Subturtle

KISS Translator — It integrates local models and diverse API providers in a lightweight tool.
Immersive Translate — Bilingual translation of text, PDFs, and videos using over 20 AI engines.
Youtube Video Transcriber — Transcribes and translates YouTube videos locally with AI summaries and fact-checking.
LLPlayer — It offers dual subtitles, real-time translation, and OCR for any video format.
GetYouTubeText — Extracts YouTube transcripts instantly with no sign up or paywall.
Read Frog — Supports 179 languages and 30 plus AI providers with bring your own key options.
AI Toolbox — Organize, search, and export chats across four major AIs in one place.
ChickyTutor — Practise speaking aloud with native-quality voices and instant feedback.
Wordtune — It offers contextual rewrite suggestions and summarizes documents, articles, and videos.
Teachoo — Guides students step by step with hints rather than giving direct answers.
Elicit — It searches 138 million papers and automates systematic literature reviews.
Lessong — Automates vocal removal, lyric timing, translation, and beat-aligned mixes.

All Subturtle alternatives