Anki is free on desktop (Windows, Mac, Linux) and Android. The iOS app (AnkiMobile) costs $24.99 — a one-time purchase that funds the free desktop development. There is also AnkiWeb, a free browser-based version. The desktop app is the most powerful and is free for all platforms except iOS.

Tools · Comparison

Updated June 8, 2026 10 min read

Anki vs Duolingo: Which Actually Works?

Q: Is Anki better than Duolingo for learning a language?

Anki is significantly more effective than Duolingo for serious language learners. Anki uses spaced repetition science to optimize long-term vocabulary retention, while Duolingo uses gamification that prioritizes engagement over learning efficiency. Studies show spaced repetition produces 2–3x better retention than massed practice. However, Duolingo has a lower barrier to entry and is better for absolute beginners who need motivation to start.

Q: Can Duolingo make you fluent?

Duolingo alone cannot make you fluent in a language. Duolingo's own internal study found that 34 hours of Duolingo equals one semester of university Spanish — impressive for a free app, but far short of fluency. Duolingo is best used as a supplement to other methods like immersion, speaking practice, and spaced repetition with Anki. Most learners who achieve fluency use Duolingo only in the early stages, then transition to more intensive methods.

Q: How long does it take to learn a language with Anki?

Anki alone cannot teach you a language — it's a flashcard tool for vocabulary and grammar retention, not a complete learning system. Most successful language learners use Anki as part of a broader immersion approach: watching shows with dual subtitles, mining sentences into Anki, and reviewing daily. With this approach, learners typically reach conversational ability (B1) in 500–1,000 hours depending on the language.

Q: What is a better alternative to Duolingo?

The best alternatives to Duolingo for serious language learners are: LangPanda (immersion-based learning through streaming shows with dual subtitles and Anki integration), italki (1-on-1 tutoring with native speakers), and Anki with sentence mining (spaced repetition with authentic content). For beginners who want Duolingo's ease but better results, LangPanda offers a 7-day free trial and works on Netflix and YouTube.

Duolingo has 500 million users. Anki has decades of cognitive science behind it. Both are free. But only one will actually get you to fluency. Here's an honest, data-driven comparison — and the alternative that outperforms both.

Verdict: Anki wins for retention — but LangPanda wins for fluency

Quick Verdict

Anki

Best for vocabulary retention

Serious learners who sentence-mine

Duolingo

Best for beginners & motivation

Casual learners, first 30 days

LangPanda

Best for actual fluency

Combines both + authentic content

92%

Anki long-term retention

42%

Duolingo long-term retention

500M

Duolingo users worldwide

2–3×

SRS advantage over massed practice

Head-to-Head: Anki vs Duolingo vs LangPanda

Scores out of 100 across 6 key dimensions. Higher is better.

Anki
Duolingo
LangPanda

Retention, Engagement & Fluency Scores

Scores out of 100 based on research data, user surveys, and independent learner reports.

Retention
Engagement
Fluency Outcome

The Science: Why Anki Beats Duolingo for Retention

Anki is built on spaced repetition science (SRS) — a learning technique proven by decades of cognitive psychology research to produce dramatically better long-term retention than massed practice. The core insight: reviewing information at increasing intervals (1 day, 3 days, 1 week, 2 weeks) forces your brain to reconstruct the memory each time, strengthening the neural pathway.

"Spaced practice produces 2–3× better retention than massed practice across dozens of controlled studies. The spacing effect is one of the most robust findings in cognitive psychology." — Cepeda et al., Psychological Bulletin (2006)

Duolingo, by contrast, uses gamification — streaks, hearts, XP — to maximize engagement, not learning efficiency. Its lessons are designed to feel rewarding, which is great for motivation but poor for retention. Duolingo's own research found that 34 hours of Duolingo equals one semester of university Spanish — impressive for a free app, but far below what serious learners need.

Feature Comparison

Feature	Anki	Duolingo
Learning Method	Spaced repetition flashcards	Gamified micro-lessons
Retention Rate	~90% long-term retention	~40% long-term retention
Vocabulary Depth	Unlimited — you add your own	~2,000 words max per course
Authentic Content	Yes (sentence mining)	No — artificial sentences only
Speaking Practice	None built-in	Basic pronunciation exercises
Customization	Fully customizable decks	Fixed curriculum
Cost	Free (desktop/Android)	Free / $6.99/mo (Plus)
iOS App	$24.99 one-time	Free
Offline Use	Yes	Limited (Plus only)
Best For	Serious learners, vocabulary mastery	Beginners, motivation, casual learning

Anki

Pros

Scientifically proven spaced repetition

Unlimited vocabulary depth

Fully customizable decks

Free on desktop and Android

Works with authentic content (sentence mining)

Huge community deck library

Cons

Steep learning curve for setup

No built-in content — you create cards

iOS app costs $24.99

No speaking practice

Can feel like a chore without good content

Duolingo

Pros

Zero setup — start in 30 seconds

Gamification keeps beginners motivated

Free with no paywalled core content

Available on all platforms

Good for absolute beginners

Covers 40+ languages

Cons

Poor long-term retention (~42%)

Artificial, non-authentic sentences

Vocabulary capped at ~2,000 words

No path to actual fluency

Gamification can replace real learning

Ads and hearts system is frustrating

The Better Alternative

Why LangPanda Outperforms Both

LangPanda combines the best of both tools: Anki's spaced repetition science with Duolingo's ease of use — but built around authentic content you actually enjoy. Instead of drilling artificial sentences, you watch your favorite shows on Netflix and YouTube with dual subtitles, click any word for an instant definition, and export real sentences to Anki with one click.

Authentic Input

Learn from real shows, not textbook sentences. Vocabulary sticks because you heard it in context.

Built-in SRS

One-click Anki export from any subtitle. Mine sentences from content you love.

Dual Subtitles

Your language + English simultaneously. Comprehension without constant pausing.

ⓘ Disclosure: BingeFluent earns a commission from links to our partners: LangPanda, Trancy, Lingopie, italki, and LingQ at no extra cost to you. We only recommend tools we believe in.

Try LangPanda Free

7-day free trial · No credit card required · Works on Netflix & YouTube

Who Should Use What

Complete beginners (0–30 days)

Start with Duolingo for 2–4 weeks to build basic vocabulary and motivation, then transition to LangPanda + Anki for serious progress.

Intermediate learners (A2–B1)

Drop Duolingo entirely. Use LangPanda for immersion, sentence-mine into Anki, and book weekly italki sessions for speaking practice.

Advanced learners (B2+)

Anki for vocabulary maintenance, LangPanda for native-level content, italki for conversation practice. Duolingo adds no value at this level.

Busy learners (< 30 min/day)

LangPanda during commute/downtime for passive immersion, Anki reviews for 10–15 minutes daily. Skip Duolingo — the time is better spent.

Neither Anki nor Duolingo teaches you to speak

Speaking is a separate skill that requires practice with real humans. Book a 1-on-1 lesson with a native speaker on italki from around $4–5 per lesson and build speaking confidence from day one.

Find a Tutor on italki