HeyDay - AI English Diary

■ Experience English becoming more familiar with just one diary sentence a day

You don’t have to write perfectly every day.
Even if you simply open the app and read “Today’s Thought,” a beautiful footprint will be added to your personal achievement map.
When you have a little more time and write a diary entry, the space will be filled with a deeper color.
Drop by casually, like stamping a daily attendance check, and enjoy filling up your own English progress board.

■ On days when even typing feels like too much, just speak your thoughts out loud

When you don’t feel like writing, try using the Voice Input feature.
The sentences you speak are automatically converted into text, helping you practice speaking and writing at the same time.

■ Receive 1:1 AI native-style feedback that even explains nuance

Stop relying on lifeless machine-translated English. Start recording your daily life in English and build real skills from today.
HeyDay corrects not only grammar mistakes, but also refines your sentences into natural native-style expressions that fit the situation.
Experience 1:1 tutoring that kindly explains even the subtle differences in nuance.

■ Make it truly yours with Re-writing Practice & Vocabulary List

Don’t just read the feedback and forget it right away. Practice re-writing to make it stick.
Rewrite corrected sentences yourself based on the feedback,
save the key expressions you learned today in your own vocabulary list, and review them until they become completely yours.

■ Zero data collection for AI training, complete privacy protection

Worried that your precious daily thoughts and private stories might be used to train an AI model?
HeyDay never collects or uses your diary data to improve AI performance or for external training purposes.
Your diary stays in a thoroughly encrypted private space, so you can safely write your honest thoughts in English.

Download HeyDay now and start building an English habit that naturally fits into your daily life without pressure.

HeyDay Premium
- Remove ads
- Write unlimited diary entries
- Expand the maximum diary character limit
- Choose AI correction level
- OCR correction, text scan
- Detailed and precise correction with high-performance AI