AIO English: Learn English

AIO English helps Vietnamese speakers practise English every day, with several ways to learn in one app: retype sentences so they stick, train listening and speaking with video, review vocabulary just before you forget it, practise pronunciation with the IPA chart, and follow a step-by-step grammar path. The interface is in Vietnamese. British English is the default accent; switch to American at any time in Settings.

Sentence typing
Retype each model sentence, from single words to phrases to full sentences. Listening and listen-and-speak modes are included. Mistakes are shown word by word, with phonetics and part of speech.

Video: Dictation & Shadowing
Four ways to study the same video: Dictation (listen and write), Shadowing (listen and repeat), Quiz (listen and answer) and Subtitles (bilingual captions). Change the speed, replay a sentence, tap a word to look it up. You can also add a captioned video of your own by pasting its link.

Vocabulary and IPA pronunciation
Study word sets, then review them on a spaced-repetition schedule. Build your own lists, import words from a file, or tap "Create vocabulary" to have AI suggest words from a topic, a text or a photo you pick; you review them before saving. The IPA section has the English sound chart, with words, phrases, sentences and listening challenges for every sound.

Grammar path
Study level by level: clear rule cards, examples and exercises corrected on the spot.

Reading and translation graded by AI
Read a passage with its translation and key vocabulary, then translate it yourself and get sentence-by-sentence feedback from AI. Sentence-by-sentence practice lets you translate one sentence at a time; if your version differs from ours, ask the AI to check it. Sentences the AI accepts are shown to other learners with your name. AI can also build an exercise from a topic or from a text you paste. The app asks for your consent before sending anything to the AI, and you can withdraw it in Settings.

Dictionary
Definitions, phonetics, British and American pronunciation, collocations, synonyms and word families. Type an inflected form such as "kids" and the dictionary points to "kid". Save words for review.

Learning path
Pick your level and goal, and the Journey tab suggests what to study each day. The Knowledge tab has a grammar map by level and mind maps.

Friends, XP and streaks
XP comes from your learning results, not from time spent with the app open. A monthly XP leaderboard shows where you stand. Check in every day to keep your streak. Add friends by @ID or an invite link, follow each other's progress and chat privately. You can hide yourself from the leaderboard, and report or block people in the app.

Pronunciation scored on your phone
When you practise speaking, your voice is recognised on the device; audio is not uploaded. The first time, the app downloads a speech model of about 60 MB, and asks first if you are on mobile data.

Daily reminder
Pick a time and your phone reminds you to study. No reminder on days you have already studied.

Light and dark
Choose light, dark or follow your device.

Community
Post feature ideas, vote and comment with other learners.

Your account
Progress is saved to your account, so sign-in is required. In Settings you can change your name, photo and password, download a copy of your data, or delete your account and all its data.

AIO English is an independent practice tool and is not affiliated with any testing organisation. There are no ads and no in-app purchases.

Recent changes:
Fixes and improvements:
• Sentence typing: Space no longer jumps back to an old word; a corrected word is marked right at once; Telex typing no longer spills into the next box.
• A new look for the home-screen widget, with light translucent keys.
• Progress updates right after every lesson.
• Labels and chips are properly centred; removed a stray underline in the menu.