Comparison

Vocabulary Builder vs Deep In

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

Head to head
About

Vocabulary Builder

Features
Read full description

Build a stronger vocabulary with flashcards designed for real learning. Learn new words with pictures, pronunciation, translations, and examples. Practice them in different ways, review them at the right time, and build your own vocabulary around the words that matter to you. Whether you're starting with the basics or expanding an advanced vocabulary, the app gives you everything you need in one place. Explore vocabulary organized by topic and CEFR level, from A1 to C2. Choose a set and start learning right away. Practice with different activities, including translation quizzes, word building, listening exercises, audio challenges, and quick tests. Take a photo of a textbook, worksheet, menu, or other study material. The app recognizes useful words so you can select the ones you want and add them directly to your vocabulary. Add your own words, translations, examples, and images. Organize them into custom sets and build a vocabulary that fits your goals. Each card can include a picture, pronunciation, translation, part of speech, and example sentences to help you understand how the word is actually used. Spaced repetition brings words back for review at the right time, helping you keep them fresh and remember them longer. Hear words pronounced aloud and train yourself to recognize them by sound. See how many words you've added, learned, and need to review. Build a streak, set a daily goal, and make vocabulary learning part of your routine. Learn a few words every day and remember them longer. Have questions or feedback? Contact our support team, and we'll be happy to help: support@vocamem.com Legal: Terms of Service: https://static.bucket53.com/flashcards/terms-of-service.html Privacy Policy: https://static.bucket53.com/flashcards/privacy-policy.html

About

Deep In

Immerse yourself in a new language by watching real YouTube videos and analyzing spoken phrases. This app provides interactive subtitles and vocabulary review to help you understand and speak like a native. Explore content on any topic you love, at your own pace.

Highlights
  • Watch real YouTube videos
  • Interactive subtitles
  • Vocabulary review and flashcards
  • Practice speaking with AI
  • Personalized content catalog
  • Learn at your own pace
Features
Read full description

Here you don't learn a language — here you feel it. You watch real YouTube videos in English and take apart whatever you didn't catch, right where you are. The difference: not lessons, immersion. ONE LINE, ALL THE WAY DOWN Someone in the video says "she's so game." Every word is familiar. Game — a game? No: she's completely up for it. A dictionary hands you one meaning and stops there. Solomia keeps going: why "game" and not "ready", who you can say it to, and three more places it turns up. NOT THE USUAL WAY No dull lessons, no homework. No invented dialogues and no manufactured topics. No practice with a teacher who isn't a native speaker either. Everything here is the real thing from the start: you just watch video in the original, on the subjects you actually care about. You learn to understand native speakers — their imperfect, spoken, real language. And you fill your vocabulary with the words and phrases they actually use. AN ENORMOUS CATALOGUE From travel vlogs to talks on anything you like. History, hiking, AI. Podcasts, stand-up, interviews, TV shows. Or add any YouTube video to your own space yourself. You watch what interests you and learn the language at the same time. INTERACTIVE SUBTITLES Stop at any moment and take apart what you didn't get. Subtitles in two languages. Any moment can go deep with Solomia, and any word or phrase can be kept — together with the sentence it came from. A VOCABULARY YOU COME BACK TO Review what you kept as flashcards, or work it through with Solomia. She brings your own words back into conversation, in new examples, until they arrive without you reaching. SOLOMIA, OUT LOUD So that you don't only understand and know a lot, but can actually speak. Talk about the video you just watched the way you would with a friend. Or ask how to say something. No appointment, and nobody else in the room. COMPLETE FREEDOM You do and watch what you want, when you want, as much as you want. No compulsory rigid programme. Only your pace, your taste and your own responsibility. WHY IT WORKS It's like stepping into the language itself. Closer to how a child learns to understand, and then to speak, their first language. They just listen, and then try. Nobody teaches them grammar or rules. By their first lesson they already understand everything — and speak freely, sometimes far too much. Just try it. Dive and feel. Created by Ukrainians SUBSCRIPTION DETAILS Deep In offers an auto-renewable subscription, available monthly, every 6 months, or yearly. New subscribers get a 7-day free trial. Prices are shown in the app before purchase. The free trial converts to a paid subscription unless it is cancelled at least 24 hours before it ends. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscription in your Apple Account settings after purchase. Terms of Use: https://deepin.world/terms Privacy Policy: https://deepin.world/privacy Support: https://deepin.world/support

Screenshots

Vocabulary Builder4 screens
Deep In4 screens

Verdict

The call

Vocabulary Builder and Deep In are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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 sells 2 in-app purchases, starting at $4.99 per 7 days and Deep In sells 7 in-app purchases, starting at $7.00 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Vocabulary Builder ships an update every 9 days, Deep In every 4 days. Both last shipped on October 31, 2026.

ScorecardNo meaningful differences
Vocabulary Builder versus Deep In: the parameters behind the verdict, then further details
ParameterVocabulary BuilderDeep In
PriceFreeFree
Rating—5.0 (5 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—5 — better
Update frequencyEvery 9 daysEvery 4 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhoneiPhone, iPod — better
Requires iOS16.015.1 — better
Further details — not scored
Size58 MB79 MB
Age rating12+17+
DeveloperIEVHENII BONDARENKODEEP IN

In-app purchases

2 purchases

Vocabulary Builder

Subscriptions2
  • 1 Week$4.997 Days
  • Yearly3 Days trial$19.991 Year
7 purchases

Deep In

Subscriptions7
  • Deep In · Lite7 Days trial$7.001 Month
  • Basic7 Days trial$14.001 Month
  • Deep7 Days trial$21.001 Month
Show 4 more
  • Deep In · Lite7 Days trial$35.006 Months
  • Deep In · Lite7 Days trial$60.001 Year
  • Deep — 6 Months7 Days trial$95.006 Months
  • Deep — Yearly7 Days trial$134.991 Year

Questions

Is Vocabulary Builder free?
Vocabulary Builder is free to download, with in-app purchases available.
Is Deep In free?
Deep In is free to download, with in-app purchases available.
Do Vocabulary Builder or Deep In have ads?
Neither Vocabulary Builder nor Deep In shows ads.
Which is updated more often, Vocabulary Builder or Deep In?
Vocabulary Builder ships an update every 9 days, and Deep In every 4 days. Most recently, Vocabulary Builder was updated on October 31, 2026 and Deep In on October 31, 2026.

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