LangFit vs Deep In
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LangFit
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LangFit is an online platform for learning foreign languages with a teacher. The LF application is an organic addition to the learning process, which allows a student to repeat their covered material conveniently and effectively. Download the application, use your LF account credentials to log in and - choose any of your personal vocabularies - mix words in sprints to avoid visual habituation - listen to the words if you have forgotten their pronunciation - test your knowledge by viewing the added translation of words and grammatical constructions. Using the app will also allow you to - change the usual 'picture', because the application has a different design - work with your vocabulary offline - translate unknown words and add them to any of your vocabularies in one click. We want to make your LF experience as comfortable as possible, so we welcome your feedback and suggestions!
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.
- Watch real YouTube videos
- Interactive subtitles
- Vocabulary review and flashcards
- Practice speaking with AI
- Personalized content catalog
- Learn at your own pace
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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
Verdict
The clearest difference is in-app purchases: LangFit at none against Deep In's 7. Deep In's advantage is update cadence (every 4 days vs every 2 months). On price, ads, 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
Both are free to download. Deep In sells 7 in-app purchases, starting at $7.00 per month. LangFit asks for nothing beyond the download.
LangFit ships an update every 2 months, Deep In every 4 days. The most recent releases landed on October 27, 2026 and October 31, 2026 respectively.
| Parameter | LangFit | Deep In |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (5 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 5 — better |
| Update frequency | Every 2 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 26 MB | 79 MB |
| Age rating | 4+ | 17+ |
| Developer | Andrii Dudar | DEEP IN |
In-app purchases
LangFit
No in-app purchases
Deep In
- Deep In · Lite7 Days trial$7.001 Month
- Basic7 Days trial$14.001 Month
- Deep7 Days trial$21.001 Month
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- 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









