Find the Right Plan for You

Our free plan is generous and yours forever — no signup needed, privacy first.

Free

No account required — just play

The Vocab extension and web app — generous, free forever, and easy to use.

DD Vocab Extension
✓ Instant word definitions & pronunciation
✓ Save words from any webpage
✓ Spaced-repetition flashcards
✓ Smart page highlighting
✓ Word difficulty tags
✓ AI drills (bring your own Gemini key)
✓ Import & export words
DeltaDaily Web App
✓ 8 NPR stories daily with broadcast audio
✓ AI transcripts with timestamps
✓ Practice drills & 28 roleplay scenarios
✓ Sign up free → 30-day Pro trial included

Start DeltaDaily Web App

Vocab Pro

$3/mo

$36/yr — save 25%

For learners who want their vocabulary to stick — unlimited AI drills, one-tap translations, and words that follow you everywhere.

DD Vocab Extension
✓ Instant word definitions & pronunciation
✓ Save words from any webpage
✓ Spaced-repetition flashcards
✓ Smart page highlighting
✓ Word difficulty tags
✓ Import & export words
Vocab Pro Extras
✓ Cross-device word sync
✓ One-tap translations
✓ Unlimited AI vocab drills (server-powered)
Bonus:
✓ DeltaDaily Web App basics included

Get Vocab Pro — $36/yr

Requires a free DeltaDaily account for sync

BEST VALUE

DeltaDaily Pro

For professionals · expense it once a year

$9/mo

$108/yr — save 40%

Built for professionals and serious learners — real-life & workplace roleplay, AI pronunciation coaching, meeting practice, distraction-free listening.

Immersive Listening
✓ Daily curated stories with broadcast audio
✓ Sentence-synced highlight (read along as you listen)
✓ AI-processed transcripts with timestamps & search
✓ User-selected story import & AI features
✓ Executive summary & story analysis
✓ Ad-free audio playback & save time
Speaking & Pronunciation
✓ Advanced prosody & intonation analysis
✓ Audio upload & speaking evaluation
✓ Meeting & presentation practice
✓ On-demand roleplay scenarios
✓ Simulate workplace conversations
Vocabulary
✓ Everything in Vocab Pro
✓ 12-language translations
✓ Advanced AI-powered word insights

Get DeltaDaily Pro — $108/yr

Best value — just $9/mo

Need an itemized invoice for reimbursement? Available from your account after subscribing.

Frequently Asked Questions

Do I need a DeltaDaily account for the extension?

No! The DD Vocab extension works 100% free without any account — save words, flashcard drills, smart highlighting, and more. Create a free DeltaDaily Basic account when you want to sync words across devices and upgrade to Vocab Pro.

Can I use my own Gemini API key for free?

Yes! Free users can add their own Gemini API key (free from Google) to power AI drills locally. Vocab Pro removes this step — AI drills are server-powered, no key needed.

What happens during the 30-day trial?

New accounts get a 30-day free trial with full DeltaDaily Pro features — enough time to enjoy the Pro plan and experience the difference. After the trial, you have full control to stay with free or pick an upgrade plan that fits your goals.

Can I switch between plans?

Yes. Upgrade from Vocab Pro to DeltaDaily Pro at any time. Your vocab data and progress carry over seamlessly.

Can I get an invoice for employer reimbursement?

Yes. After subscribing to an annual plan, you can download itemized invoices from your account page. Many employers reimburse professional development tools like DeltaDaily Pro — check with your manager or HR.

What does cross-device word sync mean?

Save a word in Chrome, Edge, on your office computer, home laptop, or tablet — it instantly appears everywhere, including the DeltaDaily Web App. No importing, no exporting, no copying. Your words just follow you.

How do I get started free?

DD Vocab and DeltaDaily are two separate products, both free. For the Vocab extension, it will be available on the Chrome Web Store soon — and when it launches, a ⭐⭐⭐⭐⭐ review helps us a lot! For the DeltaDaily Web App, just go to deltadailyapp.com — no signup, start playing right away.