Deep In vs Iterum
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Deep In
Learn languages by immersing yourself in real-world content like YouTube videos. This app focuses on understanding native speakers and building practical vocabulary through interactive subtitles and personalized review tools.
- Watch real YouTube videos in original language
- Interactive subtitles with word and phrase breakdown
- Personalized vocabulary review with flashcards
- Practice speaking with AI conversation partner
- Vast catalog of diverse video content
- Add your own YouTube videos
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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
Iterum
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Don't wait for the highest level to watch and read content in the original. Paste a YouTube or article link, or open an EPUB book. Tap an unfamiliar word or phrase — and get a translation for that exact sentence, in context. The word is saved into a deck from that source, with a tappable link back to where it was saved from. WHERE YOUR VOCABULARY COMES FROM • YouTube — translate words straight from the synced subtitles • Articles — paste a link and read in the app • EPUB books — a handy reader with font settings: typefaces and sizes • Your own decks — created by hand or pasted in from a ready-made list • Explore — ready-made sets of English words and fixed phrases by level (B1–C2) and topic TRANSLATION THAT TAKES CONTEXT INTO ACCOUNT • The meaning is matched to the sentence the word appeared in • CEFR level and frequency, so you don't learn what you don't need • Collocations and fixed phrases are translated as whole expressions FIVE TRAINERS — FROM RECOGNITION TO RECALL • Flashcards — the word, with its definition on the back • Multiple choice — one right answer out of four • True/false — judge the statement • Written — type the answer from memory • Match — pair terms with meanings CONTEXT, NOT ENDLESS LISTS Just sitting down and learning 500 words is not adaptive for memory and perception. By contrast, in Iterum vocabulary arrives in small batches tied to their source, so at review time the context comes back with the word. Decks stay grouped by source instead of merging into one list. Folders let you mix several sources when you need a wider range. SMART REVIEW — REVIEWING WITHOUT PLANNING (ADVANCED) Most systems ask you to rate how well you know a word. Iterum delegates that rating to a formula. It reads what actually happened — whether you recognize the word or type it out, in which direction, how accurately and how long it took — and sets the next review from that. Confident answers move further away, uncertain ones come back sooner. Progress is three nested rings: Reviewed, Recognized, Learned. A word becomes Learned only after you produce it in both directions across several sessions on different days. BUILT TO KEEP YOUR VOCABULARY IN ORDER • Works offline — cards and review history stay on your device • Syncs with your account, your tablet and your next phone • Reminders at a time that suits you • A progress screen showing where every word stands • Export your own cards to CSV; share a deck by link • No ads, no streaks, no mascots Study English, Spanish, French or Polish — the sources, trainers and review are the same. The ready-made Explore sets are available in English for now. More ready-made sets in other languages are coming. FREE AND ADVANCED The free plan is a full app, not a demo: new sources every month, all five trainers with no round limit, AI translation in context, your own decks and folders, reminders and the free Explore sets. Iterum Advanced adds: • Unlimited sources — articles, videos and books • Smart Review — an algorithmic review schedule and the full progress rings • Folder study — learn whole topics, not just single decks • A higher monthly AI translation allowance and ready-made sets of English fixed phrases SUBSCRIPTION INFORMATION Iterum Advanced is an auto-renewable subscription, monthly (1 month) or annual (1 year). Prices for your region are shown in the app before you confirm. New subscribers get a free trial week; after that the subscription renews automatically unless auto-renewal is turned off at least 24 hours before the end of the current period. Payment is charged to your Apple Account on confirmation. You can manage or cancel the subscription at any time in your Apple Account settings. After cancelling, your decks and progress remain — the free plan keeps working. Privacy Policy: https://www.iterum.space/privacy Terms of Use: https://www.iterum.space/terms Support: kseniia@iterum.space
Screenshots
Verdict
The clearest difference is iOS requirement: Deep In at 15.1 against Iterum's 17.0. On price, update cadence, ads and in-app purchases 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 and Iterum sells 1 in-app purchase, starting at $34.99 per year. Whichever you choose, the download price is not the number that matters.
Deep In ships an update every 6 days, Iterum every 5 days. Both last shipped on October 24, 2026.
| Parameter | Deep In | Iterum |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 6 days | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 79 MB | 77 MB |
| Age rating | 17+ | 4+ |
| Developer | DEEP IN | Kseniia Snitko |
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
Show 4 moreShow fewer
- 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
Iterum
- Annual7 Days trial$34.991 Year







