COCA Vocabulary App Is Live on Google Play — Why the Ad-Free Version Is Worth It

COCA Vocabulary App Is Live on Google Play 🎉

We’re excited to announce that COCA, our vocabulary learning app built around the 16,515 most frequent English words from COCA, is now officially live on Google Play — in two versions:

Free version (with ads)
👉 https://play.google.com/store/apps/details?id=com.lengerrong.coca

Paid version (no ads, best experience) ⭐
👉 https://play.google.com/store/apps/details?id=com.qzl.coca

Both apps share the same powerful learning core — but if you’re serious about mastering English, the paid version is the one we strongly recommend.

Demo Video

Watch COCA 16515 in action:

What Is COCA?

COCA is a vocabulary mastery app designed for learners who want to study the words that actually matter.

Instead of random word lists, COCA is built on the Corpus of Contemporary American English (COCA), covering:

✅ 16,515 high-frequency English words

📘 English–Chinese bilingual definitions

🧠 Context-rich example sentences

🔊 Pronunciation support

📈 Progress tracking with XP, streaks, and mastery goals

Whether you’re preparing for IELTS, improving professional English, or building long-term fluency, COCA helps you learn smarter, not harder.

Free vs Paid: What’s the Difference?

We offer two versions to keep COCA accessible — but they are not equal.

🆓 Free Version (With Ads)

Full access to the COCA word database

Vocabulary browsing, flashcards, and quizzes

Supported by ads

👉 A good way to try COCA and explore the content

⭐ Paid Version (No Ads — Recommended)

🚫 No ads at all

⚡ Faster, distraction-free learning

📱 Cleaner interface

❤️ Directly supports continued development

👉 This is the best way to use COCA, especially if you study daily or follow a structured learning plan.

For a learning app, focus matters. Ads break concentration — the paid version keeps you fully immersed.

Why We Created a Paid, Ad-Free Version

COCA started as a personal project during IELTS preparation. One thing became very clear:

Vocabulary learning requires deep focus and repetition.

Ads interrupt that process.

The paid version exists for learners who:

Value time and concentration

Study English every day

Want a clean, professional learning tool

Prefer a one-time purchase over constant ads

By choosing the paid version, you’re not just removing ads — you’re investing in better learning outcomes.

Features at a Glance

📚 16,515 COCA high-frequency words

🌍 English–Chinese bilingual support

🧩 Multiple meanings and usage contexts

🔁 Review, revisit, and reinforce difficult words

🎯 XP, streaks, and mastery tracking

📱 Optimized for mobile learning

Available Platforms

🌐 Web App: https://coca.qz-l.com

📱 Android (Free with Ads):
https://play.google.com/store/apps/details?id=com.lengerrong.coca

⭐ Android (Paid, No Ads – Recommended):
https://play.google.com/store/apps/details?id=com.qzl.coca

What’s Next for COCA?

We’re actively improving COCA, with upcoming plans including:

🧠 Smarter review and adaptive learning

⏱️ Spaced repetition for long-term retention

🌐 More bilingual language support

📊 Deeper progress analytics

Revenue from the paid version directly supports these upgrades.

Final Recommendation

If you’re just curious — start with the free version.
If you’re serious about improving your English — go paid.

🎯 No ads. No distractions. Just learning.

👉 Get the paid COCA app now: