Duolingo
Perplexity AI
| Feature | Duolingo | Perplexity AI |
|---|---|---|
| Pricing | Free / from $9.99/mo | Free / from $20/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.6 / 5 | 4.5 / 5 |
| Best For | language-learners, students, travelers, beginners | researchers, students, journalists, professionals |
| Founded | 2011 | 2022 |
| Lessons | ✓ | ✗ |
| Stories | ✓ | ✗ |
| Podcasts | ✓ | ✗ |
| Ai Chat | ✓ | ✗ |
| Leaderboards | ✓ | ✗ |
| Streaks | ✓ | ✗ |
| Placement Tests | ✓ | ✗ |
| Search | ✗ | ✓ |
| Citations | ✗ | ✓ |
| Focus Modes | ✗ | ✓ |
| File Upload | ✗ | ✓ |
| Collections | ✗ | ✓ |
| Api | ✗ | ✓ |
✓ Duolingo Pros
- Completely free core experience
- Gamification makes learning addictive
- AI conversation practice
- 40+ language courses
✗ Duolingo Cons
- Limited for advanced learners
- Ads on free tier
- Grammar explanations can be minimal
✓ Perplexity AI Pros
- Source citations
- Real-time web access
- Focus modes
- Clean UI
✗ Perplexity AI Cons
- Limited free queries
- Can still have errors
- No document upload on free
The Verdict
Duolingo is built for language learners and students, with a focus on lessons and stories. Perplexity AI targets researchers and students and leads with search and citations.
On pricing, Duolingo is the clear winner for budget-conscious users — starting at $9.99/mo compared to $20/mo for Perplexity AI. That $10.01/mo difference adds up quickly for growing teams.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Feature-wise, Duolingo offers broader built-in capabilities (7 features vs 6), while Perplexity AI takes a more focused approach — which can mean a simpler, faster onboarding experience.
Both tools are a solid fit for students — in those cases, the decision often comes down to workflow style and how your team prefers to organize work.
This is a genuinely close comparison. If you can, sign up for both free trials (where available) and run a one-week test with your actual team tasks before deciding.
