The Best AI Keyboard for iPhone
14 AI writing tools live inside your iPhone keyboard. Fix grammar, change tone, translate, and reply with AI in WhatsApp, iMessage, Mail, and every other app — without copy-pasting into ChatGPT.
Your complete AI writing toolkit
Works in Messages, Mail, WhatsApp, Notes, X, Instagram — every app you type in.
Check Grammar
Correct grammatical and spelling errors to perfect your text.
Tone Changer
Friendly, formal, sarcastic, empathetic — 12+ tones to fit any message.
Ask AI
Get accurate answers to any question, in any language, without leaving your keyboard.
Translate
Translate between 55+ languages right from your keyboard, in any app.
Humanize
Make AI-generated or stiff text sound natural and human — beat AI detectors.
Paraphrase
Express the same meaning with different words while keeping the text's essence.
Reply
AI drafts a contextually relevant reply based on the conversation you’re in.
Continue Text
Expand your narrative while preserving the original tone and language.
Write Emails
Turn a one-line brief into a polished email — opening, body, sign-off.
Rewrite Post
Turn a rough idea into a compelling social media post that drives engagement.
Find Synonyms
Enrich your vocabulary with linguistically diverse synonyms in a tap.
Emojify
Add the right emoji to any sentence automatically. No more searching the emoji picker.
Custom Prompts
Create your own AI commands — anything you can describe, KeyAI can do.
Auto Paste
One-tap paste for the lines you send all the time — addresses, greetings, links.
Works everywhere you write
No copy-paste. No app switching. AI is always one tap away.
Your typing is never logged
KeyAI only sends text to AI when you tap a feature — never silently, never in password fields. iOS guarantees the second part: Apple auto-switches to the system keyboard for passwords and card numbers, so KeyAI literally cannot see them.
Loved by 100,000+ people on iPhone
Real reviews from the App Store.
"Used this app for one day and it's been a huge game changer. As someone who sends tons of business emails from my phone, I don't have to overthink my responses anymore. The tone changer works amazingly!"
"The ultimate AI app for everyday use — very smooth and easy to use. It's definitely worth your money."
"Surprisingly useful. I didn't think switching to a third-party keyboard would be convenient — but it's not much work to swap in to check the grammar."
"This keyboard is just amazing, especially the tone changer. The developer actually listens — feature requests shipped within 2 weeks."
Try it free for 3 days
Lock in the lowest cost per month — Save 84% vs Weekly.
Secured by the App Store. Cancel anytime.
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Pay once, yours forever
Frequently asked questions
Everything you need to know about KeyAI.
What is KeyAI?
An iPhone keyboard with 14 AI writing tools built in — grammar, tone change, translation, AI replies, paraphrasing, ask-AI, and more. All inside the keyboard, in every app. No copy-paste to ChatGPT.
How is this different from ChatGPT?
ChatGPT is a separate app — you leave your conversation, type the message there, copy the response back. KeyAI lives in your keyboard, so the AI is always one tap away — in iMessage, WhatsApp, Mail, Notes, X, Instagram, wherever you're already typing.
How is this different from Grammarly Keyboard?
Grammarly fixes grammar. KeyAI fixes grammar plus 13 other things — tone change, translation in 55+ languages, AI-generated replies, paraphrasing, synonyms, and asking AI anything. If you only fix typos, Grammarly is fine. If you actually write on your iPhone, KeyAI is the upgrade.
Does KeyAI work with my native language?
60+ keyboard layouts including English, Spanish, French, German, Portuguese, Italian, Dutch, Arabic, Japanese, Korean, and more. Translation supports 55+ languages.
Is my typing private?
Yes. Text is only sent to AI when you tap a feature — we never silently capture what you're writing. iOS also auto-switches to the system keyboard for password fields and card numbers, so KeyAI literally cannot see those.
Why does it ask for Full Access?
iOS requires Full Access for any third-party keyboard to use the internet — which KeyAI needs to talk to the AI. We use it only for that, never to log keystrokes.
How much does it cost?
There's a 3-day free trial. After that, choose Weekly, Yearly (best value), or Lifetime — Apple handles all billing through the App Store. Cancel anytime in your Apple ID subscriptions.
Will it work on my iPad?
Yes — KeyAI works on iPhone and iPad with the same subscription.
How do I install KeyAI?
Download from the App Store, then Settings → General → Keyboard → Keyboards → Add New Keyboard → KeyAI, and enable Allow Full Access. Takes 30 seconds.
Can I cancel anytime?
Yes. Subscription is managed in your Apple ID settings — cancel any time before the trial ends and you will not be charged.
Does it work on Android?
Not yet. KeyAI is built for iPhone and iPad only — we use iOS-specific APIs (Full Access, system keyboard handoff for password fields) to keep your typing private. There is no Android version planned in 2026.
Does it work in WhatsApp?
Yes — KeyAI works in WhatsApp, iMessage, Mail, Notes, Instagram, X, Slack, LinkedIn, Telegram, and every other text field on iOS. The AI tools are in the keyboard, not in any specific app.
Find KeyAI for your case
How KeyAI compares, and the workflows it fits.
Join 100,000+ users writing smarter on iPhone
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