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Stop Studying.
Start Browsing.
Janus.

Janus changes wordswords on your page into a target language. Learn vocabularyvocabulary naturally while browsing your favorite content.

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https://example-news-site.com/article

Unlock Effortless Language Learning with Janus

Janus revolutionizes how you acquire new vocabulary by seamlessly integrating language learning into your daily browsing habits. Imagine effortlessly absorbing new words in their natural contexto as you read articles, blogs, or any online content. Our intelligent system analyzes the text on any webpage and subtly replaces specific words with their translations in your target language. This isn't just random substitution; Janus focuses on relevante vocabulary tailored to your learning level, making the process feel natural and intuitive. You build your understanding word by word, creating an inmersiva experience without ever needing to open a textbook. Unlike others, we don't promise you'll learn the language, but you'll absolutely LEARN.

🔒 No credit card required • ⚡ Install in seconds • 🌍 Works on any website
Privacy-first: Your learning is your business. We never collect personal data.

How Janus Works

Janus seamlessly integrates with your browsing experience

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Just Browse

Read whatever you normally read. Check your news, browse Reddit, whatever. Janus is just there doing its thing.

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Janus Picks Words

It finds words you might know but aren't totally solid on yet—ones that are useful but not too hard.

Premium: Advanced selection using concepts from peer-reviewed 1,2,3,4 • VADER Sentiment Analysis (Hutto & Gilbert, 2014)
• Real-Time Sentiment Dashboard (Reddy et al., 2025)
• Text-Based Emotion Detection (Kusal et al., 2022)
• Sentiment Analysis Review (Nandwani & Verma, 2021) emotion quantification algorithms.

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You Learn Without Trying

Instead of seeing "house" you see "casa." Your brain connects it to the real article you're reading, so it sticks better.

Premium: AI determines which words from the algorithm's list are actually right for your level, so you're not seeing stuff that's too easy or too hard.

Why Choose Janus?

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Zero Time Investment

Learn while doing what you already do. No extra study time required.

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Contextual Learning

Words are learned in their natural context, improving retention and understanding.

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AI-Powered Selection

Smart algorithms choose words based on your level and learning goals.

Premium: Enhanced with peer-reviewed 1,2,3,4 • VADER Sentiment Analysis (Hutto & Gilbert, 2014)
• Real-Time Sentiment Dashboard (Reddy et al., 2025)
• Text-Based Emotion Detection (Kusal et al., 2022)
• Sentiment Analysis Review (Nandwani & Verma, 2021) emotion quantification algorithms for superior word selection.

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Privacy First

Your browsing data stays private. We only process text for translations, and never store or link it to you.

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Progress Tracking

Opt-in analytics show your vocabulary growth and learning patterns. Only if you choose premium and opt in, and never linked to your identity.

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Multiple Languages

Support for dozens of languages with more being added regularly.

Simple Pricing

Choose the plan that fits your learning journey

Free

$0/month

Perfect for trying out Janus

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    Unlimited smart word translations
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    All languages supported
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    Privacy protection

Premium

$4/month

For serious language learners looking to supplement their learning

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    Context driven AI-powered word selection using peer reviewed 1,2,3,4 • VADER Sentiment Analysis (Hutto & Gilbert, 2014)
    • Real-Time Sentiment Dashboard (Reddy et al., 2025)
    • Text-Based Emotion Detection (Kusal et al., 2022)
    • Sentiment Analysis Review (Nandwani & Verma, 2021)     techniques
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    Opt-in progress analytics and personalized insights
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    Difficulty customization
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    Priority support

FAQ

How does Janus select which words to translate?

Will this slow down my browsing?

Is my browsing data private?

Can I use Janus on mobile?

What languages are supported?

What if Janus gets too distracting or annoying?

Does this actually work better than studying?

Ready to Transform Your Learning?

Join other learners who are already using Janus to master new languages

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Support Contact

Need help or have questions? Reach out to our support team:

Email: info@threshold.technology Copied!

Research References

1.
VADER: A Parsimonious Rule-Based Model for Sentiment Analysis of Social Media Text
C. Hutto and E. Gilbert (2014). Proceedings of the International AAAI Conference on Web and Social Media
https://ojs.aaai.org/index.php/ICWSM/article/view/14550
2.
Visualizing Public Opinion on X: A Real-Time Sentiment Dashboard Using VADER and DistilBERT
Y. Abhiram Reddy et al. (2025). arXiv preprint arXiv:2504.15448
https://arxiv.org/abs/2504.15448
3.
A Review on Text-Based Emotion Detection -- Techniques, Applications, Datasets, and Future Directions
S. Kusal et al. (2022). arXiv preprint arXiv:2205.03235
https://arxiv.org/abs/2205.03235
4.
A review on sentiment analysis and emotion detection from text
P. Nandwani and R. Verma (2021). Social Network Analysis and Mining
https://link.springer.com/article/10.1007/s13278-021-00776-6