Four Steps to Real Vocabulary
Most language apps make learning complicated. Gamified streaks, daily missions, rigid curricula. LetzLingo cuts through the noise: you choose what to learn, the algorithm handles when to review it, and you watch your vocabulary grow.
Choose Your Language
Pick from 15+ languages including rare options like Croatian and Farsi.
Import PDF or Browse Decks
Bring your own vocabulary via PDF, or start with built-in topic decks.
Study with SRS
Rate each card — the spaced repetition algorithm schedules reviews automatically.
Track Your Progress
Watch your mastered word count grow. See streaks, accuracy, and session history.
Step 1 — Choose Your Language
Select from 15+ Languages
Open LetzLingo and tap the language you want to study. The app supports 15+ languages spanning every major world region — including languages that most flashcard apps don't offer at all.
Languages available include Russian, Spanish, French, German, Chinese (Mandarin), Japanese, Korean, Portuguese, Italian, Arabic, Hindi, Dutch, Polish, Turkish, Croatian, and Farsi. More are added regularly.
You can study multiple languages simultaneously. Each language has its own deck library, independent SRS schedule, and separate progress tracking — so your Spanish progress never interferes with your Japanese study.
Step 2 — Import a PDF or Browse Built-in Decks
Bring Your Own Content — or Use Ours
LetzLingo gives you two paths to a studyable deck, and both take under a minute.
Option A: Import a PDF. Have a textbook vocabulary list? A teacher handout? A glossary from a language course? Tap "Import PDF," select the file from your device, and LetzLingo converts it into a flashcard deck automatically. This is the feature no other major flashcard app offers.
Option B: Browse built-in decks. LetzLingo includes ready-made decks organized by topic — everyday vocabulary, travel phrases, business language, numbers, food, family — and by difficulty level from beginner through advanced.
How PDF Import Works — The Full Workflow
Step 3 — The Spaced Repetition Algorithm
Study Smarter, Not Longer
When you open a study session, LetzLingo shows you the cards that are due for review — no more, no less. For each card, you rate your recall: easy, okay, or hard.
That single rating tells the algorithm exactly when to show you that card again. An easy card might not appear for a week. A hard card reappears in minutes. Over time, the algorithm builds a schedule where you review each word at the optimal moment for memory consolidation.
This is why spaced repetition learners consistently outperform traditional study methods — the algorithm ensures no mental effort is wasted reviewing things you already know solidly.
The Science Behind Spaced Repetition
Hermann Ebbinghaus mapped the forgetting curve in 1885 — memory decays exponentially unless reinforced at the right moments. Modern SRS algorithms (SM-2 and its descendants) operationalize this research into precise review scheduling. The result is vocabulary that moves from short-term into long-term memory in a fraction of the time traditional methods require.
How the SRS Schedule Works in Practice
When you first encounter a new card, the algorithm assumes you've never seen it. After you rate it:
- Hard: Reappears in 5–10 minutes in the same session. The algorithm classifies it as a "learning card."
- Okay: Reappears tomorrow. Transitions to "review" status after two consecutive okay ratings.
- Easy: Scheduled for review in 3–4 days initially, then doubles with each subsequent easy rating (4 → 8 → 16 days, etc.).
Over weeks and months, words you know well disappear from your daily sessions almost entirely. You spend your study time on the words that actually need work — which is exactly how expert language learners maintain large vocabularies efficiently.
Step 4 — Track Your Progress
See Your Vocabulary Grow
Progress tracking in LetzLingo is intentionally simple. There are no artificial streaks that expire at midnight or leaderboards pushing you to compete with strangers. The dashboard shows you what actually matters: how your vocabulary is growing over time.
Every card that clears the SRS threshold — meaning you've correctly recalled it across multiple review sessions at increasing intervals — counts as mastered. Your mastered vocabulary count is the clearest measure of real language progress.
Session history shows your daily review count and accuracy rate so you can see which days you studied and how much improvement happened over time.
Tips for Effective Vocabulary Learning
LetzLingo does the scheduling work for you, but how you engage with the material makes a significant difference. These evidence-based techniques will accelerate your progress.
Study Daily, Not in Bursts
10 minutes every day beats 2 hours on Sunday. The SRS algorithm is built for daily consistency — missing days creates a backlog of due cards and weakens memory consolidation.
Say Words Out Loud
Vocalize each word when reviewing — don't just read it silently. Speaking activates production memory, which is different from recognition memory and far more useful in conversation.
Always Play the Audio
Listen to the pronunciation before flipping the card. This trains your ear to recognize the word in spoken language, not just on paper. Especially critical for Russian, Arabic, Chinese, and Farsi.
Import Your Actual Study Materials
Import PDFs from your current course or textbook rather than starting with generic decks. Learning vocabulary in context — the words your teacher uses — produces faster results.
Be Honest with Your Ratings
Mark cards as "Easy" only if you recalled them instantly without hesitation. Inflating your ratings feels good momentarily but lengthens review intervals too aggressively, causing words to slip out of memory before their next review.
Keep Decks Focused
Smaller, thematically focused decks (food vocabulary, travel phrases, work terms) outperform giant catch-all decks. When you import a PDF, consider splitting large documents into topic-specific sections.
Why LetzLingo Works Better Than Alternatives
There are dozens of language learning and flashcard apps. Here's what makes LetzLingo's approach more effective for serious vocabulary learners:
Vs. Duolingo
Duolingo is excellent for absolute beginners and for building a habit through gamification. But it controls every aspect of what you learn — you can't bring your own vocabulary, you can't import your textbook's word list, and for languages like Croatian or Farsi, Duolingo simply has no course. LetzLingo complements or replaces Duolingo for learners who need vocabulary control.
Vs. Anki
Anki pioneered digital spaced repetition and has millions of community-created decks. But the desktop interface is notoriously complex, the mobile app costs $25 on iOS, and importing content requires formatting a CSV file manually. LetzLingo gives you the same SRS power with a modern interface, native PDF import, and zero cost — with no setup required.
Vs. Quizlet
Quizlet is the most popular flashcard platform, but it doesn't use spaced repetition — it uses random repetition, which is far less effective for long-term retention. Key features like offline access and advanced study modes require a $7.99/month subscription. Quizlet also requires account creation. LetzLingo is free, offline-first, and uses true SRS.
The PDF Import Advantage
None of these competitors — Duolingo, Anki, Quizlet — offer direct PDF import. This single feature transforms LetzLingo from "yet another flashcard app" into an indispensable companion for anyone who already has language learning materials in PDF form — which is virtually every student, traveler, and professional language learner.
Frequently Asked Questions
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