Comparison

Klug vs Wortschatz

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Klug

Features
Read full description

KLUG - YOUR AI-POWERED GERMAN TUTOR Learn German the smart way. All lessons, vocabulary, grammar explanations, and exercises are completely free - no subscription needed for the core curriculum. What makes Klug different? Two AI assistants designed to replicate the benefits of a private tutor, ready 24/7. - AI TEACHER - Ask anything about German - grammar rules, word meanings, cultural context, why one phrase works and another doesn't. Your AI teacher knows your progress, remembers what you've struggled with, and adapts explanations to your level. - AI SPEAKING BUDDY - Practice real conversations on any topic - ordering coffee, job interviews, weekend plans, philosophy. Speak naturally, get instant feedback, and build the confidence to speak German in the real world. - A COMPLETE CEFR-ALIGNED CURRICULUM - * 260+ lessons covering A1 (beginner) to B2 (upper-intermediate) * Structured learning path: greetings, daily life, work, travel, and complex discussions * Vocabulary cards with native audio pronunciation * Grammar explanations with worked examples * Dialogue practice and reading passages * Exercises after every lesson - SMART REVIEW SYSTEM - Spaced repetition keeps vocabulary in your memory long-term. Klug tracks what you know and reminds you exactly when you're about to forget - no wasted time on words you've mastered. - DESIGNED FOR REAL PROGRESS - * Personal notebook for vocabulary and notes * Offline access for all core lessons * Daily goal tracking * No account required - start learning in seconds * Privacy-first design - HONEST PRICING - All lessons, vocabulary, grammar, and exercises are free forever. AI Teacher and AI Speaking Buddy conversations consume credits. You get free credits to start, and can buy more or subscribe ($4.99/month or $29.99/year) for unlimited AI conversations. Whether you're preparing for a Goethe exam, planning a trip to Berlin, or just love German culture - Klug is your patient, always-available tutor. TERMS OF USE (EULA): https://klug-app.web.app/eula

About

Wortschatz

Features
Read full description

Wortschatz turns language learning into small, useful moments throughout your day. Choose a learning language, set your level, select how many vocabulary notifications you want each day, and define your preferred time window. Wortschatz distributes the prompts randomly or evenly—whichever fits your routine. HIGHLIGHTS • Randomized or evenly distributed vocabulary notifications • Choose the number of daily prompts and your active hours • Home Screen and Lock Screen widgets • On-device pronunciation with slower playback and language variants • Discover mode with strict no-repeat rounds • Searchable vocabulary with Favorites, Learned and Hidden • Structured language guides with explanations and examples • Signed downloadable language packs stored locally for offline use • English and German interface • Learning packs for English, German, Spanish, Japanese and Modern Standard Arabic, depending on your base language FREE • One active learning language • Up to three vocabulary notifications per day • Ad-supported access WORTSCHATZ PRO • No ads • Multiple active learning languages • More daily notifications—up to approximately one per hour in your chosen time window Existing configurations are preserved if a Pro subscription ends; nothing is deleted automatically. Your learning data stays on your device. No account is required. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://claudiusthelen.com/data/ Wortschatz is German for “word treasure”—a growing collection of words you make your own.

Screenshots

Klug4 screens
Wortschatz3 screens

Verdict

The call

The clearest difference is ads: Klug at none against Wortschatz's shown. Klug also leads on update cadence (every 2 days vs every 4 days). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Klug sells 5 in-app purchases, starting at $4.99 per month and Wortschatz sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Klug ships an update every 2 days, Wortschatz every 4 days. The most recent releases landed on October 25, 2026 and November 3, 2026 respectively.

Scorecard2 real differences · 4 level
Klug versus Wortschatz: the parameters behind the verdict, then further details
ParameterKlugWortschatz
PriceFreeFree
Update frequencyEvery 2 days — betterEvery 4 days
AdsNo — betterYes
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size19 MB5 MB
Age rating4+12+
Developercan ozelClaudius Thelen

In-app purchases

5 purchases

Klug

Subscriptions2
  • Monthly Plan$4.991 Month
  • Yearly Plan$29.991 Year
One-time3
  • 1000 Credits$2.99
  • 4,000 Credits$9.99
  • 10,000 Credits$19.99
2 purchases

Wortschatz

Subscriptions2
  • Wortschatz Pro Monthly$1.991 Month
  • Wortschatz Pro Yearly7 Days trial$12.991 Year

Questions

Is Klug free?
Klug is free to download, with in-app purchases available.
Is Wortschatz free?
Wortschatz is free to download, with in-app purchases available.
Do Klug or Wortschatz have ads?
Wortschatz shows ads; Klug does not.
Which is updated more often, Klug or Wortschatz?
Klug ships an update every 2 days, and Wortschatz every 4 days. Most recently, Klug was updated on October 25, 2026 and Wortschatz on November 3, 2026.

Other comparisons