Comparison

Bulb vs Trapkovac

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

Head to head
About

Bulb

Read full description

Learn languages by reading real books and browsing websites. Tap any word for instant translation, build vocabulary from what you read, and improve your writing with AI feedback. Bulb is for people who want to learn through authentic content instead of gamified drills. Import EPUB books, browse foreign-language websites with built-in translation, and use AI feedback to improve your writing. === HOW IT WORKS === READ REAL BOOKS Import EPUB books in your target language. Tap any word for instant translation and pronunciation. Save words to your vocabulary as you read. Double-tap sentences for full context. Create bookmarks and highlights. BROWSE AND TRANSLATE WEBSITES Read news, articles, and blogs in your target language with built-in translation. Tap unfamiliar words for definitions. Save vocabulary while browsing. Practice with real-world content that interests you. BUILD VOCABULARY IN CONTEXT Every word you look up is saved with its original sentence. Review with spaced repetition flashcards generated from your reading. Practice translating sentences back and forth. Learn words as they are actually used. GET AI WRITING FEEDBACK Write essays, emails, or journal entries and receive detailed analysis of grammar, style, and vocabulary. See specific error patterns with visual charts. Get suggestions tailored to your level. Track your improvement over time. === WHO IT IS FOR === - Professionals improving business English or foreign-language writing for work - Students preparing for language exams with real reading and writing practice - Book lovers who want to read novels and nonfiction in other languages - Learners who prefer authentic content over artificial lessons and gamified drills === SUPPORTED LANGUAGES === English, Spanish, French, German, Chinese, Japanese, Italian, Portuguese, Russian, Korean, Arabic, Serbian === KEY FEATURES === - EPUB reader with tap-to-translate - Built-in web browser with instant translation - Automatic vocabulary capture with context - Spaced repetition flashcards - AI essay analysis with grammar, style, and vocabulary feedback - Writing progress tracking with visual charts - iCloud sync across all your iOS devices Built for focused reading, vocabulary, and writing practice without gamified drills. Requires internet connection for AI features and translation. Privacy Policy: https://thebulb.app/privacy Terms of Service: https://thebulb.app/terms

About

Trapkovac

Features
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My fiancΓ© is Serbian. I wanted to learn well enough to talk with her family, so I built the course I wished I could find. Trapkovac teaches Serbian with clear explanations, useful vocabulary, and practice that helps it stick. It is for English speakers who want more than flashcards: you learn why a case ending changes, which words sound natural in conversation, and how to build your own sentences with confidence. There are 1,000+ lessons, over 5,000 words and phrases, and content from A1 beginner through B2 intermediate. Everything is included from the moment you install it, no subscription, trial, ads, or locked lessons. Serbian, clearly explained. Serbian grammar can look intimidating at first. Trapkovac breaks it into manageable lessons and explains what is happening as you go. Learn the patterns, not just the answer to one question. Both alphabets. Serbian is written in both Latin and Cyrillic, and both are part of everyday life. Choose the script you want to read, switch whenever you like, and build confidence in both. Pronunciation help on every word. Each word comes with a simple pronunciation guide and marked stress, so you can start speaking before reading Cyrillic feels automatic. Practice that remembers. Words return for review just before you are likely to forget them. Easy words get out of your way, the ones you keep missing get the extra practice they need. Speak when you want to. Optional speaking exercises give you a chance to practice saying words aloud. They are there when you want them and easy to turn off in Settings. Learn anywhere. Lessons, reviews, and audio work offline. There is no account to create, no sign-in, and your progress stays on your device. What's included: 85+ categories 1,000+ lessons Over 5,000 words and phrases A1 through B2 content Grammar, conversation, travel, pronunciation, and a searchable reference Trapkovac teaches the Ekavian form of Serbian, used across most of Serbia. Serbian is closely related to Croatian, Bosnian, and Montenegrin, so much of the vocabulary and grammar will feel familiar across the region, while this course stays clear about the Serbian forms it teaches. Built for people who want to understand Serbian, not just tap through it. A note from the me. This is a hobby project, built by one person a little at a time. It will not be perfect, and new lessons and fixes are added as I go. If you find something wrong or missing, feedback is genuinely welcome. Thank you for giving Serbian a try.

Screenshots

Trapkovac4 screens

Verdict

The call

The clearest difference is in-app purchases: Trapkovac at none against Bulb's 3. On price, ads, device support and iOS requirement there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Bulb sells 3 in-app purchases, starting at $2.99 per 7 days. Trapkovac asks for nothing beyond the download.

Scorecard1 real difference Β· 5 level
Bulb versus Trapkovac: the parameters behind the verdict, then further details
ParameterBulbTrapkovac
PriceFreeFree
Update frequencyEvery 5 daysβ€”
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhone, iPad β€” betteriPhone
Requires iOS17.0 β€” better17.6
Further details β€” not scored
Size40 MB7 MB
Age rating17+4+
DeveloperDanis GaiazovALEXANDER DAVID TRAPTOW

In-app purchases

3 purchases

Bulb

Subscriptions3
  • Premium Weekly$2.997 Days
  • Premium Monthly7 Days trial$6.991 Month
  • Premium Annual7 Days trial$49.991 Year
None

Trapkovac

No in-app purchases

Questions

Is Bulb free?
Bulb is free to download, with in-app purchases available.
Is Trapkovac free?
Trapkovac is free to download, with no in-app purchases.
Do Bulb or Trapkovac have ads?
Neither Bulb nor Trapkovac shows ads.

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