ChatNPU vs Grammar Fix

ChatNPU Keyboard rewrites your text instantly in the style you choose. Select an identity, tap once, and you are offered a new version powered by on-device AI. Built for privacy, your typed and rewritten text stays on device. ChatNPU is available on supported devices with the required on-device AI capabilities.

GrammarFix is the on-device AI keyboard that fixes your grammar, sharpens your writing, and keeps every word private. Tap once to correct grammar and spelling anywhere you type - Messages, Mail, Notes, social apps, any text field. Need a different tone? Rewrite the same text as Professional, Friendly, Concise, Polite, Confident, or Funny. Translate as you type into 10 languages. Or open the built-in AI chat to draft and refine anything. Everything runs on your iPhone using Apple Intelligence. No servers. No network. No tracking. Your words never leave your device - so you get powerful AI writing help without handing your text to anyone. WHAT YOU CAN DO • Fix grammar and spelling instantly, right from the keyboard • Rewrite in any style: Professional, Friendly, Concise, Polite, Confident, Funny • Add fitting emoji to your message with one tap • Translate your text into 10 languages, on-device • Chat with an on-device AI to write emails, notes, replies, and more • Craft: send what you've typed straight into chat to refine it • Save your own custom rewrite styles PRIVATE BY DESIGN GrammarFix processes everything locally with Apple's on-device models. Nothing you type is sent to a server or shared with anyone, ever. FREE AND PREMIUM Fixing grammar is free, forever — plus a few AI chats every day. Upgrade to Premium for every writing style, translation, emoji, custom presets, and unlimited AI chat. Choose a one-time Lifetime unlock or a monthly or yearly subscription (the yearly plan includes a free trial). REQUIREMENTS The on-device AI features need an iPhone with Apple Intelligence (iOS 26). On other devices, GrammarFix uses a lighter built-in spelling fix. Subscriptions auto-renew unless canceled at least 24 hours before the end of the period; manage or cancel anytime in your Apple Account settings. Terms of Use: https://appcitystudios.com/eula - Privacy Policy: https://appcitystudios.com/privacy-policy Write with confidence - privately. Download GrammarFix today. Terms of Use (EULA): https://appcitystudios.com/eula Privacy Policy: https://appcitystudios.com/privacy-policy