Comparison

Vocabulary Builder · Palabring vs knowra

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

Head to head
About

Vocabulary Builder · Palabring

Features
Read full description

Looking for the best way to expand your vocabulary? Palabring is an AI-powered flashcard app that uses spaced repetition to help you learn 8 languages — offline, hands-free, and for free. Whether you're preparing for exams, traveling abroad, or learning your first foreign language, Palabring adapts to your pace with a scientifically-proven algorithm based on Ebbinghaus's forgetting curve. Over 100 topic packs, an AI assistant, and a voice mode make it the most effective vocabulary app on iOS. SMART FLASHCARDS WITH SPACED REPETITION Swipe right if you remember a word, left if you don't. Palabring's algorithm shows difficult words more often and easy words less frequently, so you spend time where it matters most. Unlike Anki, there's no manual card creation — just pick a topic pack and start learning. AI-POWERED LANGUAGE ASSISTANT Ask the AI assistant to explain any word with contextual examples, synonyms, and usage notes. Describe a scenario and get a vocabulary list instantly. Send photos with foreign text to add words to your deck. The AI helps you understand nuances that dictionaries miss. VOICE MODE — LEARN HANDS-FREE Practice vocabulary while driving, cooking, or walking. Speak translations aloud and Palabring checks your answer automatically. It's the best way to fit language learning into a busy day. 100+ TOPIC PACKS PER LANGUAGE Thousands of words and phrases organized by real-life situations: travel, restaurants, business, medical, academic, daily life, and more. Choose topics that interest you and start learning immediately. ADD YOUR OWN WORDS Focus on the vocabulary you need — exam prep, professional terminology, or everyday phrases you find difficult. Add custom words and phrases to your personal dictionary. WORKS OFFLINE — LEARN ANYWHERE All flashcards and topic packs work without internet. Learn on a plane, in the subway, or anywhere without Wi-Fi. PROGRESS TRACKING Set daily goals, track your streak, and see how many words you've mastered on a clean dashboard. 8 LANGUAGES SUPPORTED English, Spanish, Russian, German, French, Italian, Portuguese, and Dutch. People use it for: — "I need to learn restaurant vocabulary before my trip to Spain" — "What's a good free app to study for the GRE vocabulary section?" — "I want to review flashcards during my commute without looking at my phone" — "How do I memorize professional terminology in German for my new job?" — "I need an offline vocabulary app that actually uses spaced repetition" Free to start. No account required. Learn more: https://www.palabring.app Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

knowra

Features
Read full description

Knowra helps you quickly screen research papers and focus on what is worth reading. Discover: - Swipeable paper cards for fast keep-or-skip decisions - Personalized feed based on your fields and goals - Clear at-a-glance signals to support fast judgment Scout: - Open Scout for structured paper briefs - Read key points first, then decide whether to go deeper Library: - Save papers you care about and revisit them anytime - Search and filter your saved list by keywords and categories - Open the original source when you are ready for full reading Account & Sync: - Sign in with Email OTP, Apple, or Google - Keep preferences and activity synced across sessions Knowra is built for researchers, engineers, and students who want to stay current without information overload. Privacy Policy: https://knowra.app/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Vocabulary Builder · Palabring4 screens
knowra4 screens

Verdict

The call

The clearest difference is update cadence: Vocabulary Builder · Palabring at every 2 weeks against knowra's every 7 months. Vocabulary Builder · Palabring also leads on iOS requirement (15.6 vs 26.0). On price, ads, in-app purchases and device support 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. Vocabulary Builder · Palabring sells 2 in-app purchases, starting at $4.99 per month and knowra sells 4 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Vocabulary Builder · Palabring ships an update every 2 weeks, knowra every 7 months. The most recent releases landed on November 4, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 4 level
Vocabulary Builder · Palabring versus knowra: the parameters behind the verdict, then further details
ParameterVocabulary Builder · Palabringknowra
PriceFreeFree
Update frequencyEvery 2 weeks — betterEvery 7 months
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPod — betteriPhone
Requires iOS15.6 — better26.0
Further details — not scored
Size39 MB11 MB
Age rating4+12+
DeveloperAleksandr Subbotin瑞基 张

In-app purchases

2 purchases

Vocabulary Builder · Palabring

Subscriptions2
  • Pro Monthly$4.991 Month
  • Pro Yearly$49.991 Year
4 purchases

knowra

Subscriptions4
  • Pro Monthly1 Month trial$9.991 Month
  • Pro Monthly$9.991 Month
  • Pro Yearly$99.001 Year
Show 1 more
  • Pro Yearly$99.991 Year

Questions

Is Vocabulary Builder · Palabring free?
Vocabulary Builder · Palabring is free to download, with in-app purchases available.
Is knowra free?
knowra is free to download, with in-app purchases available.
Do Vocabulary Builder · Palabring or knowra have ads?
Neither Vocabulary Builder · Palabring nor knowra shows ads.
Which is updated more often, Vocabulary Builder · Palabring or knowra?
Vocabulary Builder · Palabring ships an update every 2 weeks, and knowra every 7 months. Most recently, Vocabulary Builder · Palabring was updated on November 4, 2026 and knowra on October 28, 2026.

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