⭐ 100K+ users

The Best AI Keyboard for iPhone

Fix grammar, change tone, translate, and reply with AI — right from your keyboard, inside any app.

★★★★★
Join 100,000+ people writing better with AI
Download on the App Store 4.6 on the App Store
Alex
Hey! Are you free Friday?
I'd love to. What time works?
Yeah sure friday works for me
✓ Check Grammar
♪ Tone Changer
? Ask AI
✨ Tools
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10 AI tools, one keyboard

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

Alter the emotional undertone to suit your message — friendly, formal, sarcastic, and more.

🤖

Ask AI

Get accurate answers to your questions in any language with AI.

🌐

Translate

Broaden your reach with translations to over 55 languages.

↻

Paraphrase

Express the same meaning with different words and maintain the text's essence.

💬

Reply

Engage in conversation with contextually relevant replies generated by AI.

➤

Continue Text

Seamlessly expand your narrative while preserving the original tone and language.

⇄

Find Synonyms

Enrich your vocabulary with linguistically diverse synonyms.

✨

Rewrite Post

Make compelling social media posts that drive engagement.

📋

Auto Paste

Effortlessly paste frequently used text for use in any context.

Works everywhere you write

No copy-paste. No app switching. AI is always one tap away.

💬
iMessage
✉️
Mail
📞
WhatsApp
📝
Notes
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X
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Instagram
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Slack
in
LinkedIn
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Telegram

Private by default

We only send text to OpenAI when you tap an AI feature. Apple automatically switches to the system keyboard for passwords, credit card numbers, and other sensitive fields. Your typing is never silently captured.

Pricing

Try it free for 3 days

★ Trusted by 100,000+ users worldwide
Weekly
$4.99 / week

3-day free trial · Cancel anytime

Save 84%
Yearly
$39.99 / year

3-day free trial · Cancel anytime

Best Value
Lifetime
$59.99

Pay once, yours forever

Start 3-day Free Trial

Secured by the App Store. Cancel anytime.

Frequently asked questions

Everything you need to know about KeyAI.

What is KeyAI?
KeyAI is an AI-powered keyboard for iPhone. It adds 10+ writing tools — grammar check, tone change, translation, paraphrase, replies, and more — right inside your keyboard, so you can use AI in any app without copy-pasting into ChatGPT.
How is this different from ChatGPT?
ChatGPT is a separate app — you have to leave your conversation, type your message there, then copy the response back. KeyAI runs inside your keyboard in every app, so the AI is always one tap away in iMessage, WhatsApp, Mail, Notes, X, Instagram — wherever you're already writing.
How is this different from Grammarly Keyboard?
Grammarly is mostly grammar correction. KeyAI does that plus tone change, translation in 55+ languages, AI-generated replies, paraphrasing, synonyms, and asking AI any question — all from inside your keyboard.
Does KeyAI work with my native language?
Yes — KeyAI supports 60+ keyboard layouts including English, Spanish, French, German, Portuguese, Italian, Dutch, Arabic, Japanese, Korean, and more.
Is my typing private?
Yes. We only transmit text to OpenAI when you tap a feature — we never silently capture what you're writing. Apple also automatically switches to the system keyboard for password fields, credit card numbers, and other sensitive inputs.
Why does it ask for Full Access?
Full Access is required by iOS 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 your keystrokes.
How much does it cost?
KeyAI is $4.99 / week or $39.99 / year (saving 84%). New users get a 3-day free trial. Billing is handled by 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 go to 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.

Join 100,000+ users writing smarter on iPhone

Free for 3 days. No credit card to start the trial.

Download on the App Store