PromptPadGrammar keyboard for iPhone: fix grammar in any app.
Type the way you normally do. Tap Fix Grammar above the keys, and PromptPad corrects the whole message right where you wrote it.
How tap-to-fix works
PromptPad is a grammar keyboard for iPhone that fixes a whole message in one tap. It does not underline words while you type. You write, tap Fix Grammar, and the corrected text replaces what you wrote in the same field.
That makes it quick for short messages, where you just want the mistakes gone before you hit send. If you want to check the result first, use Preview mode: you see the corrected version, then Apply it or Regenerate. Instant mode skips the check and replaces the text straight away.
Fix Grammar is meant to correct spelling, grammar and punctuation while keeping your words and tone. If you want the message to sound different, that is a rewrite, and a separate shortcut does it.
Before and after, in real apps
You typedrunning late their was traffic, be their in 10
SentRunning late, there was traffic. I'll be there in 10.
You typedHi Sara, i attached the the report you asked, let me know if their is any questions.
SentHi Sara, I attached the report you asked for. Let me know if there are any questions.
You typedwho's turn is it to review, i dont want too step on anyones toes
SentWhose turn is it to review? I don't want to step on anyone's toes.
You typedno se si podre ir mañana, te aviso despues
SentNo sé si podré ir mañana. Te aviso después.
Results come back in the language you wrote in. The keyboard types in 9 languages, so you can fix grammar in 9 languages and translate with the same keyboard.
Ways to fix grammar on iPhone
You have four realistic options, and the right one depends on what you want help with.
1. Autocorrect and spell check
Built into the Apple keyboard and free. It catches typos as you type, but it does little for grammar, punctuation or a sentence that is technically correct and still reads badly.
2. Apple Writing Tools: Proofread
On iPhones that support Apple Intelligence, you can select text and choose Proofread. It is free, private and built in, and it shows what it changed. You need a supported iPhone, and you select the text first.
3. The Grammarly keyboard
Grammarly suggests corrections as you type and explains them. If you want to learn from your mistakes, or you already use Grammarly on a computer, it is a strong choice. It is built mainly for English.
4. PromptPad
One tap fixes the whole message, in any app, in 9 keyboard languages, and it works on iPhones without Apple Intelligence through cloud AI. It does not explain each correction. It is built for people who want the message right and want to move on.
PromptPad vs Grammarly vs Apple Writing Tools
A fair comparison as of October 2026. Competitor features change, so check their current listings too.
| Feature | PromptPad | Grammarly keyboard | Apple Writing Tools |
|---|---|---|---|
| How you fix | Tap one shortcut, the whole message is corrected | Suggestions appear as you type, tap to accept | Select text, then choose Proofread |
| Explains mistakes | No, it rewrites the text | Yes | Shows what changed |
| Languages | Keyboard types 9 languages, including Arabic and Persian | Built mainly for English | Languages supported by Apple Intelligence |
| On-device option | Yes, with Apple Intelligence | Cloud-based | Yes |
| Without Apple Intelligence | Yes, through cloud AI | Yes | No |
| Beyond grammar | Custom shortcuts for tone, length and translation | Tone and clarity suggestions | Rewrite, Friendly, Professional, Concise and summaries |
| Price | Free plan, Pro subscription | Free plan, paid plan | Free, built in |
Where the others are better. Grammarly is better if you want explanations and steady feedback on your writing, across your phone and computer. Apple Writing Tools is better if you have a supported iPhone and want something free that needs no extra keyboard. PromptPad is better if you write in more than one language, want one tap instead of select-then-menu, or want the same keyboard to fix, rewrite and translate.
For a wider look at Apple's tools, read PromptPad vs Apple Proofread and Writing Tools.
Grammar keyboard questions
Does PromptPad check grammar while I type?
No. PromptPad fixes grammar when you tap the Fix Grammar shortcut, not word by word as you type. The whole message is corrected at once, in the field you are typing in.
Will Fix Grammar change what I meant?
It is designed to correct mistakes and keep your wording and tone. AI can still get things wrong, so use Preview mode when it matters: you see the result before anything changes.
Is PromptPad a Grammarly alternative?
For quick fixes in messages, yes. PromptPad corrects the whole text in one tap and works in 9 keyboard languages. Grammarly is the better choice if you want explanations for each correction.
Is the grammar keyboard free?
Yes, to start. The free plan includes 4 shortcuts, 20 cloud AI runs, unlimited on-device runs and 2 of the 9 keyboard languages. Pro makes everything unlimited.
Go beyond grammar
Fix Grammar is one shortcut on the PromptPad AI keyboard. Setting it up takes about a minute: see how to add the keyboard.
Your next message
is already better.
Free on the App Store. Works in the apps you already use.
Download on theApp StoreFor iPhone. Free plan included. On-device AI needs iOS 26 and an iPhone that supports Apple Intelligence.