OBAdm vs Langu
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OBAdm
This app provides online tests and an e-book for students and schools participating in OBAdm. It also features the 'Jogo Floresta Bela' game.
- Online tests
- Jogo Floresta Bela game
- E-book access
- Exclusive for OBAdm participants
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Este aplicativo exclusivo para os estudantes e escolas participantes da OBAdm Provas ONLINE Jogo Floresta Bela E-book
Langu
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Langu is a messenger for people who are learning a language. You talk to real people, at your own pace, and the app helps exactly where you get stuck: a word you don't know, a sentence you didn't follow, or a reply you can't work out how to write. No flashcards, no generic lessons. You learn by having conversations. HOW IT WORKS Every chat has two languages: yours and the one on the other side. You write in the language you're learning, and the other person reads it in theirs. Both of you practise at the same time, in the same conversation. WHAT YOU CAN DO • Translate any message without leaving the chat, with the original and translation side by side. • Ask for a grammar explanation of a whole sentence: the app breaks it into pieces, explains each word and shows the rules being used. • Long-press a message to access learning tools and look up individual words. • Get suggested replies when you're lost for words, already written in the language you're practising. • Play any message as audio to work on listening and pronunciation. • Record voice notes, send photos and reply to specific messages, like any messenger. • Chat in groups with several language partners in the same room. • Keep a daily streak with each person and see how long you've been practising together. PROGRESS THAT IS ACTUALLY MEASURED Langu tracks four things from your real conversations, not from tests: • Reading — how much of what you read you genuinely understand. • Writing independence — how much you write on your own, without using suggestions. • Accuracy — how much of what you write comes out correct. • Vocabulary — words you understand and words you already use yourself. No invented levels and no quizzes. The numbers come from conversations you have already had. PLANS Langu is free for chatting, translating and a few grammar explanations each day. Plus and Pro unlock higher daily translation limits, more grammar explanations per day, suggested replies, writing evaluation and the full fluency dashboard. Pro can also connect your conversations to Telegram. Subscriptions are monthly or annual, billed through your Apple account, and renew automatically at the price and frequency shown in the app unless cancelled at least 24 hours before the end of the current period. You can manage or cancel at any time in your Apple account settings. AI FEATURES Translation, grammar explanations, suggested replies and writing evaluation use artificial intelligence models. These features only process the content of your messages if you turn on AI content sharing in Settings — and you can turn it off whenever you want. PRIVACY AND SAFETY Langu is for people aged 13 and over. You can block and report users or content, and conversations are moderated to help keep the community safe. You sign in with your phone number. Your conversations are yours: we don't sell your data or use your messages for advertising. The full privacy policy is available in the app and on the store listing. Terms of Use: https://languchat.com/terms Privacy Policy: https://languchat.com/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: OBAdm at none against Langu's 4. OBAdm also leads on update cadence (every 2 days vs weekly) and iOS requirement (14.0 vs 16.4). On price, ads and device support 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. Langu sells 4 in-app purchases, starting at $7.99 per month. OBAdm asks for nothing beyond the download.
OBAdm ships an update every 2 days, Langu weekly. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.
| Parameter | OBAdm | Langu |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | — |
| Update frequency | Every 2 days — better | Weekly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 14.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 195 MB | 80 MB |
| Age rating | +4 | 12+ |
| Developer | MOBTEX DESENVOLVIMENTO DE SOFTWARE EIRELI | Kaio Alexandre Marques |
In-app purchases
OBAdm
No in-app purchases
Langu
- Langu Plus Monthly7 Days trial$7.991 Month
- Langu Pro Monthly$14.991 Month
- Langu Plus Annual7 Days trial$59.001 Year
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- Langu Pro Annual$109.991 Year









