HeyDay - AI English Diary

Write a little, get corrected, and make it yours. HeyDay turns a daily English diary into real progress.

■ Instant corrections
• Smart Check fixes common learner mistakes, like tenses and prepositions, right on your phone and for free.
• AI correction polishes every sentence so it sounds natural, and suggests expressions that fit your diary.
• Every fix comes with a short explanation in your language.
• Stuck on a word? Write it in your own language and HeyDay turns it into English.

■ Easy diary writing
• A new "Today's idea" prompt every day gets your first sentence going.
• Pick a mode: one line, three lines, gratitude or free writing.
• Not in the mood to type? Write by voice.

■ Make it stick
• Listen to your diary, then practice the corrected sentences with Shadowing and Copy out.
• Review quizzes built from your own mistakes
• A weakness report shows the mistakes you make most.
• Save expressions and feedback to Words and review them with the meanings hidden.

■ 5 minutes a day in the Learn tab
• 4,000 flashcards: everyday conversation, phrasal verbs, business English, and words for daily life, travel and the TOEIC
• Every card comes with a short example sentence.
• Pick your level and go through cards with "I know it" or "Show again".

■ English on your lock screen
• While you study, the current card stays on your lock screen as a notification.
• Home screen word widgets and a word-of-the-day notification keep words in sight.

■ See your progress
• A calendar that fills up as you write, plus streaks and streak freezes
• A stamp book that grows with every finished diary
• Ghost league: race against your own past weeks
• Monthly and yearly recap cards
• Time capsule: rewrite a diary from a month or a year ago and compare

■ Your diary stays private
• Your diary is stored on your phone.
• On supported devices, AI corrections run on the device, too.
• Your diary is never used to train AI.

■ HeyDay Premium
• Unlimited AI corrections on any device
• Diaries up to 2,000 characters (500 on the free plan)
• Choose your correction level
• Smart review with 5 quiz types, an all-time weakness report and mini lessons
• My-sentence widget and word card alerts
• Unlimited translation helper, pronunciation, Shadowing and Copy out
• Text from photos and cloud backup
• 3 streak freezes a month and no ads
• Monthly or yearly subscription, or a one-time lifetime purchase

The free plan includes Smart Check, AI corrections on supported devices (3 a week), the Learn tab, Words and lock screen learning.

Subscriptions renew automatically until canceled. Manage or cancel anytime under Payments & subscriptions in the Google Play app.