Duolingo uses spaced repetition and adaptive algorithms to personalise lesson difficulty. Its free tier covers fundamentals; premium unlocks streak freezes, ad-free experience and offline access. Available on web, iOS and Android with over 30 languages.
| Pricing from | Free, Premium from £9.99/month |
| Best for | Casual learners, busy professionals, cost-conscious students |
| Website | www.duolingo.com |
Strengths and trade-offs
- Highly addictive gamified interface keeps learners engaged
- Extensive free tier covers basic proficiency for most languages
- Limited advanced grammar instruction for B2+ levels
- Heavy reliance on translation exercises rather than immersion
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