Your iPhone is where you write most of your messages, emails, and posts, but its built-in tools are limited when it comes to grammar.
What the iPhone checks on its own #
iOS includes Check Spelling and Auto-Correction (in Settings → General → Keyboard). They underline misspelled words and fix common typos as you type.
What they usually miss:
- words that are spelled correctly but wrong in context (their/there, its/it's, then/than),
- subject–verb agreement (The list of items are long),
- punctuation problems like comma splices, and
- awkward or unclear sentences.
Check grammar with AI Grammar Checker #
AI Grammar Checker is a free iPhone app that fixes grammar, spelling, and punctuation together.
- Copy your text from Mail, Messages, Notes, or any app.
- Open AI Grammar Checker and tap Paste.
- Tap Check Grammar. You'll see your original text with the correction right below it.
- Tap the correction to copy it, then paste it back where you were writing.
Want it phrased differently? Check the same text again to get a fresh paraphrase.
Tips for better results #
- Check full sentences, not single words. The AI uses context to choose the right fix.
- Check before important messages: job applications, work emails, and anything you can't unsend.
- Read the correction before you paste it, so you learn from your most common mistakes.
Is it free? #
Yes. AI Grammar Checker includes 3 free checks every day. If you write a lot, Pro gives you unlimited checks.
Download AI Grammar Checker on the App Store and try it on your next message.