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Corodomo vs 4You: how two video-based language apps differ

By Official AppDuo editorial team · Updated

Corodomo logoCorodomo8.1/10Freemium · ≈ $6.98/mo (₫179,000/mo)4You logo4You6.7/10Freemium · $7.99/mo

Quick verdict

Corodomo and 4You are both built by Vietnamese companies and both turn real videos into lessons, with bilingual subtitles, word lookup, shadowing, dictation and AI speaking practice. They differ in how practice is organised, how clearly prices are published and how data is handled.

Corodomo: suits learners who prioritise subtitle and translation quality, a broad set of listening, speaking, reading and writing features, and guided AI Coaching for shadowing with word-level scoring, a curated library sorted by topic and level, and JLPT, HSK and TOEIC practice. Prices are listed in VND, the Free plan's limits are spelled out, and the privacy policy names each AI data processor. Keep in mind that speaking, detailed pronunciation scoring and subtitle generation share one AI-hour allowance (1 hour a month on Free), and automatic subtitles on imported videos should be checked.

4You: suits learners interested in less common languages within the vendor’s stated 40+ language range, community participation or vocabulary practice through the Word Garden game. It has more user ratings, but free-tier limits are unpublished, the Android version contains ads, profiles are public by default and its two store privacy declarations contradict each other.

Head-to-head

Corodomo leads on 4, 4You on 0, 6 even

FeatureCorodomo4You
Where the videos come from[2],[15],[16],[21]A curated library sorted by topic and level (everyday life, business, IT, news; the Corodomo team says videos are reviewed). You can also import videos, including from YouTube: up to 1 on Free, any video up to 2 hours long on Plus, up to 4 hours with bulk import on Pro.Pick videos in the app, share from YouTube and TikTok or upload your own; the app adds bilingual subtitles and a one-tap dictionary.
→ Both let learners add their own videos; importing personal material alone is not a reason to default to 4You. Corodomo fits priorities such as subtitle and translation quality and varied practice modes; consider 4You for less common languages, community participation or vocabulary games. Check current import support if direct links from a particular platform are essential.
Shadowing and pronunciation feedback[6],[7],[9],[19],[20],[21]1:1 AI Coaching assigns short tasks by goal, level and schedule; you listen to the model, overlap-read, shadow without text and submit a recording. AI scores each sentence and word, flags mispronounced or skipped words, suggests retries of weak sentences and tracks progress.Shadowing, dictation and cloze exercises on videos. The cited sources do not describe how pronunciation is scored; some reviewers report the first words of a sentence going missing during shadowing.
→ If you want to know exactly which words to fix, Corodomo documents that loop in more detail. Neither has independent evidence of AI scoring accuracy, and AI Coaching only reached iOS in version 1.1.15 (8 Nov 2026).
Speaking practice with AI[9],[13],[17],[19],[21]CoroAI runs situational or video-based conversations such as ordering food, workplace talk, interviews, presentations and Japanese kaiwa. It reached iOS in version 1.0.33 (12 Jul 2026).AI speaking practice graded from A1 to C2. Per the privacy policy, Premium AI features may share data with AI vendors such as OpenAI.
→ Corodomo ties conversation to specific situations and the material you are studying; 4You organises it by level from A1 to C2. Both rely on AI for speaking, so each one's voice-data terms are worth reading.
Dictation, revision and exam practice[3],[8],[14],[19],[21]Dictation, translation, quizzes, summaries, mindmaps and flashcards built from the lesson, none of which uses AI hours. JLPT, HSK and TOEIC practice, plus AI-graded HSK writing.Dictation, cloze, a vocabulary notebook with spaced-repetition flashcards, a Word Garden game, plus reading, writing, grammar and a community.
→ Learners preparing for JLPT, HSK or TOEIC get dedicated practice in Corodomo; 4You is more explicit about spaced-repetition vocabulary review and game-style drills.
Languages to learn and interface languages[5],[11],[12],[14],[19],[21]Dedicated material for English (IPA, TOEIC), Japanese (furigana, kaiwa, JLPT) and Chinese (HSK); the cited sources give no full list of learnable languages. The interface comes in 11 languages: Vietnamese, English, Japanese, Chinese, Korean, Indonesian, Spanish, French, German, Russian and Portuguese.The vendor says it supports learning 40+ languages, including English, Chinese, Korean, Japanese, French, German and Spanish. Store listings show an English-only interface.
→ If you are learning a less common language, check 4You's list; beginners who want to navigate in their own language get more interface options in Corodomo (11 against English only).
Paid plans for individuals[2],[19],[20]Official pricing in VND (Vietnam): Plus 179,000 ₫/month (≈ $6.98/month) or 1,392,000 ₫/year (≈ $54.26/year) (116,000 ₫/month (≈ $4.52/month)), 30 AI hours/month; Pro 399,000 ₫/month (≈ $15.55/month) or 3,156,000 ₫/year (≈ $123/year) (263,000 ₫/month (≈ $10.25/month)), 100 AI hours/month. One-time lifetime options: Plus 2,990,000 ₫ (≈ $117), Pro 5,999,000 ₫ (≈ $234).Per the US App Store description: Premium $7.99/month, $26.99 for 3 months or $45.99 for 12 months (about $3.83/month), auto-renewing. The in-app purchase list shows several other price points for the same periods without plan names.
→ The two list prices in different currencies and channels, so they cannot be compared directly. Corodomo spells out what each plan includes; with 4You, check the actual price in your store before subscribing.
What the free tier includes[2],[3],[18],[19],[20]Free plan: limited video access, up to 1 import and 1 AI hour a month. Watching subtitled videos, lookup, dictation, translation, quizzes and flashcards do not use AI hours; subtitle generation, detailed pronunciation scoring and speaking do.Free to download, but neither the store listing nor the terms state the free tier's limits; premium features sit behind the subscription. One App Store reviewer complains that new features keep moving into the paid tier.
→ If you want to know what you get before paying, Corodomo's pricing page answers that; 4You does not publish it, so you have to install the app to find out.
Ads[2],[17],[21]The pricing page lists Plus and Pro as ad-free.The Google Play listing says the app contains ads. Per the privacy policy, third-party ad networks serve personalised ads, which can be turned off in settings.
→ If you want ad-free study, Corodomo's Plus and Pro plans say so explicitly; the pricing page does not say whether Free shows ads. For 4You, the sources do not say whether Premium removes ads; if you use it, consider switching off personalised ads.
Privacy and AI data[4],[17],[19],[21]The policy names Soniox, OpenAI, Google Gemini and Anthropic Claude and the data each receives; asks for in-app consent first and restricts training use; access, correction, deletion and export by email. It does not download or store YouTube videos. No concrete retention periods.Profiles are public by default (switchable to private). AI data may go to OpenAI, which may keep copies of text or audio responses; audio may go to a third-party speech recogniser. The App Store declaration lists data possibly used for tracking, while Google Play declares no data collected or shared.
→ Both send data to third-party AI providers, but Corodomo names each one and asks for consent first, while 4You makes profiles public by default and has two contradictory store declarations. If you use 4You, set your profile to private when you sign up. This rests on published policies, not security audits.
Store ratings[9],[10],[19],[20],[21],[22]Vietnam App Store 4.9/5 (946 ratings), Google Play Vietnam 4.8/5 (531 ratings).Vietnam App Store 4.67/5 (3,583 ratings), US App Store 4.72/5 (103 ratings), Google Play 4.6/5 (2,910 ratings).
→ Corodomo's averages are slightly higher, while 4You has far more ratings (3,583 against 946 on the Vietnam App Store; 2,910 against 531 on Google Play). Store ratings reflect satisfaction, not learning outcomes.

Prices marked ≈ are converted to USD at the reference rate of Nov 12, 2026 (ExchangeRate-API) so they can be compared. What you pay follows the vendor's price and exchange rate.

Choose Corodomo if…

  • Learners who prioritise subtitle and translation quality, broad listening, speaking, reading and writing features, especially guided AI shadowing coaching with sentence- and word-level scoring
  • Japanese or Chinese learners, or anyone preparing for JLPT, HSK or TOEIC using video material
  • People who want clear free-plan limits up front and ad-free paid plans

Choose 4You if…

  • Learners of less common languages who find their target language in the vendor’s stated 40+ language range
  • Learners who want to combine language study with participation in the in-app community
  • Learners who like spaced-repetition flashcards and a vocabulary game (Word Garden)

Same video-first idea, different structure

Corodomo centres on a curated library sorted by topic and level, then builds practice around each lesson: bilingual subtitles, Japanese furigana, English IPA, sentence-by-sentence practice, dictation, translation, quizzes and flashcards. You can still import videos, such as YouTube videos, but the library's review process should not be assumed to cover every import.

4You centres on the videos you choose: picks from the app, clips shared from YouTube or TikTok, or your own uploads, which the app turns into a lesson with bilingual subtitles, a one-tap dictionary, shadowing, dictation and cloze exercises. 4You reached the App Store on 20 January 2026; Corodomo added video-based language learning to its homepage in March 2025 and released its iOS app on 13 November 2025.

Speaking: AI Coaching or level-based drills

The clearest difference is speaking. Corodomo's AI Coaching turns shadowing into a guided cycle: set a goal, level and schedule; listen, understand, overlap-read and shadow; submit a recording; get sentence- and word-level scoring and retry weak sentences. CoroAI adds situational conversations such as ordering food, interviews or Japanese kaiwa. Feedback comes from AI, not a human teacher.

4You offers shadowing and AI speaking practice graded from A1 to C2, but the cited sources do not describe how pronunciation is scored. Some reviewers report the first words of a sentence going missing during shadowing and slow loading when pasting long videos. Neither app has independent evidence of AI accuracy.

Pricing, free tier and refunds

Corodomo lists VND prices on its website: Plus 179,000 ₫/month (≈ $6.98/month) or 116,000 ₫/month (≈ $4.52/month) billed yearly, Pro 399,000 ₫/month (≈ $15.55/month) or 263,000 ₫/month (≈ $10.25/month) billed yearly, plus one-time lifetime options. The Free plan states 1 AI hour a month and up to 1 import. Web purchases are refunded only in set cases, such as duplicate charges or a plan not activated within 7 days, with requests due within 30 days; App Store and Google Play purchases are handled by Apple and Google.

Per 4You's terms, all purchases go through Apple or Google. The US App Store description lists Premium at $7.99/month or $45.99 for 12 months, but the in-app purchase list shows several prices for the same periods without plan names, and the vendor does not say what the free tier includes. The vendor cannot refund directly; requests follow Apple's or Google's policy.

Ads, privacy and support

Corodomo's policy names each AI data processor, describes in-app consent and restrictions on training use, but gives no concrete retention periods. Plus and Pro are ad-free. Support runs through email, documentation and community channels.

On 4You, profiles are public by default (switchable to private) and AI data may be shared with OpenAI. The Google Play listing says the app contains ads, and the privacy policy says third-party ad networks serve personalised ads (which can be switched off in settings). The App Store declaration lists data possibly used for tracking while Google Play declares no data collected or shared; the two contradict each other. Support is by email only. As of 12 November 2026, AppDuo's research found no documented controversies or incidents for 4You.

Frequently asked questions

Which is cheaper, Corodomo or 4You?

They cannot be compared directly because they list prices in different currencies. Corodomo Plus is 179,000 ₫/month (≈ $6.98/month) or 116,000 ₫/month (≈ $4.52/month) billed yearly (official VND pricing). 4You Premium is $7.99/month or about $3.83/month billed yearly per the US App Store description, though the in-app list shows other unnamed price points.

Which app can use TikTok videos?

Per its Google Play listing, 4You accepts videos shared from YouTube and TikTok, or your own uploads. Corodomo lets you import videos, including from YouTube; the cited sources do not mention TikTok.

Which suits Japanese learners?

Corodomo offers furigana, kaiwa practice with CoroAI and JLPT practice. 4You lists Japanese among its 40+ languages, but the cited sources mention no Japanese-specific material.

Do the apps show ads?

Corodomo's Plus and Pro plans are listed as ad-free; the pricing page does not say whether Free shows ads. 4You's Google Play listing says the app contains ads, and the vendor uses third-party ad networks for personalised ads, which can be turned off in settings.

Sources

Numbers in the table refer to these sources, read on the dates shown.

  1. 1.Official homepage · Vendor-provided · Nov 10, 2026
  2. 2.Official pricing page · Vendor-provided · Nov 12, 2026
  3. 3.AI quota guide · Vendor-provided · Nov 10, 2026
  4. 4.Terms of Use, Privacy Policy & Refund Policy · Vendor-provided · Nov 10, 2026
  5. 5.llms.txt (official product facts) · Vendor-provided · Nov 10, 2026
  6. 6.Shadowing page (English UI) · Vendor-provided · Nov 10, 2026
  7. 7.AI Coaching page · Vendor-provided · Nov 10, 2026
  8. 8.JLPT practice page · Vendor-provided · Nov 10, 2026
  9. 9.App Store listing (Vietnam) · store · Nov 10, 2026
  10. 10.Google Play listing (Vietnam) · store · Nov 10, 2026
  11. 11.Japanese learning: furigana and sentence practice · Vendor-provided · Nov 10, 2026
  12. 12.English learning: IPA and pronunciation practice · Vendor-provided · Nov 10, 2026
  13. 13.CoroAI situational speaking · Vendor-provided · Nov 10, 2026
  14. 14.HSK reading and AI-graded writing practice · Vendor-provided · Nov 10, 2026
  15. 15.Curated courses (course detail supplied by product team) · Vendor-provided · Nov 10, 2026
  16. 16.4You official website · Vendor-provided · Nov 12, 2026
  17. 17.4You privacy policy · Vendor-provided · Nov 12, 2026
  18. 18.4You terms of service · Vendor-provided · Nov 12, 2026
  19. 19.App Store listing (US) · store · Nov 12, 2026
  20. 20.App Store listing (Vietnam) · store · Nov 12, 2026
  21. 21.Google Play listing · store · Nov 12, 2026
  22. 22.iTunes lookup API (Vietnam) · store · Nov 12, 2026
  23. 23.iTunes Lookup API (release date, version) · store · Nov 10, 2026
  24. 24.Wayback Machine: corodomo.com (2025-03-19) · Community-reported · Nov 10, 2026

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