LetzLingo vs. Duolingo, Anki, Quizlet & Memrise

The Bottom Line Upfront

Every major language app has a different strength. Choosing the wrong one wastes weeks of study time. Here's the two-sentence verdict on each, then the full breakdown:

Full Feature Comparison Table

Every significant feature side by side. LetzLingo is highlighted in green.

PDF import is the only feature in this table that LetzLingo has and no other app offers. All other information current as of June 2026.

LetzLingo vs. Duolingo — Detailed Breakdown

Duolingo is the world's most-downloaded language app with over 500 million users. It's also a fundamentally different product from LetzLingo. They serve different learners.

The Croatian and Farsi Gap

Duolingo's course catalog prioritizes high-traffic languages. Croatian has an estimated 7 million native speakers globally — but Duolingo has no Croatian course. Farsi (Persian) has an estimated 70–110 million speakers and Duolingo's Farsi course has been in limited beta for years with no full release. Both languages are fully supported in LetzLingo from day one, including audio pronunciation and built-in vocabulary decks.

The Curriculum Control Problem

Duolingo's pedagogical philosophy is that the app knows best. This works well when you're learning Spanish from zero — the curriculum is well-designed. But university students, heritage language learners, and professionals often need to study specific vocabulary: the words from their textbook, the terms their professor uses, the phrases their grandmother says. Duolingo cannot accommodate this. LetzLingo's PDF import is the direct solution.

LetzLingo vs. Anki — Detailed Breakdown

Anki is the gold standard for spaced repetition. Medical students worldwide use it to memorize thousands of drug interactions. Language learners use it to maintain multiple languages simultaneously. It is also notoriously difficult to use.

The iOS Cost Issue

Anki on iPhone and iPad costs $24.99 as a one-time purchase. This is one of the most expensive utility apps on the App Store. LetzLingo is free on iOS and Android. For users who primarily study on mobile — which is the majority of language learners — this is a decisive difference.

The Import Experience

Anki's import function requires you to first export your vocabulary as a CSV file with specific column formatting, then import that file through Anki's desktop interface, then sync to mobile. LetzLingo lets you select a PDF from your Files app and have a deck in seconds. The workflow difference is not incremental — it's the difference between a tool you actually use and one you abandon during setup.

LetzLingo vs. Quizlet — Detailed Breakdown

Quizlet is the most used flashcard platform among students. Its library of community-created sets is vast, and its game-based study modes (Match, Gravity, Live) make vocabulary practice more engaging than traditional flashcard review.

Why Spaced Repetition Beats Random Review

Quizlet's free study modes cycle through cards randomly. This produces short-term familiarity — you can pass a test the next day — but words learned through random repetition fade within 72 hours for most people. LetzLingo's SRS algorithm schedules each card at the scientifically optimal interval for long-term memory consolidation. Vocabulary studied in LetzLingo is still retrievable weeks and months later because the algorithm ensures each word gets reviewed just before it would be forgotten.

LetzLingo vs. Memrise

Memrise differentiates itself through native speaker video clips — short recordings of actual people using vocabulary words in real sentences. This is a genuinely valuable feature for learners who want authentic pronunciation and cultural context.

Where Memrise falls short is the same place most competitors do: it has no PDF import, no Croatian or Farsi support, limited free-tier access to advanced study modes, and requires account creation. The native video feature is compelling, but Memrise's vocabulary control and study methodology are more constrained than LetzLingo's.

LetzLingo's Unique Advantages

Across all five apps in this comparison, LetzLingo is the only one that offers all of the following simultaneously:

Which App Should You Choose?

Choose LetzLingo if you:

• Have your own vocabulary lists in PDF format (textbooks, handouts, glossaries)
• Are learning Croatian, Farsi, Russian, Polish, or another language with limited support elsewhere
• Want true spaced repetition without paying for a subscription
• Need full offline functionality (frequent traveler, poor connectivity, data-conscious)
• Don't want to create an account or share personal data with a language app
• Are a university student, heritage language learner, or working professional who needs vocabulary control

Choose Duolingo if you:

• Are an absolute beginner with no prior language study experience
• Find gamification and streaks motivating
• Are studying a major language (Spanish, French, German) with a complete Duolingo curriculum

Choose Anki if you:

• Are an advanced learner comfortable with technical tools
• Want access to community-created shared decks (especially for medical or academic study)
• Study primarily on desktop and can use the free version

Choose Quizlet if you:

• Want to find pre-made sets created by your teacher or classmates
• Prefer game-based review for casual vocabulary practice
• Are studying for short-term tests where long-term retention is less critical

Privacy Comparison

Privacy in language apps is rarely discussed but matters significantly. Your learning patterns — which words you struggle with, how often you study, what subjects you're pursuing — are sensitive behavioral data.

LetzLingo and Anki are the only major apps that require no account and store data exclusively on your device. Duolingo's 2023 privacy policy disclosed sharing learning data with advertising partners for targeted campaigns.

Frequently Asked Questions

Try the App That Does More

PDF import. Spaced repetition. Croatian and Farsi. Fully offline. No account. Completely free. LetzLingo is the flashcard app built for serious vocabulary learners.