Yes, you can build a grammar editor and add an iPhone keyboard for writing in other apps.
You can build grammar checks, rewrite suggestions, and a custom keyboard. Start with an editor inside your app, then add the keyboard and test it on your iPhone. The keyboard can work with available text, but it cannot freely read other apps.
What keeps people on Grammarly:Licensed contentYears of dataYears of polish
The checker split your own version of Grammarly into its key parts and sorted each one.
Writing editor
Vibecode can build a text editor that shows suggestions as you type.
Works out of the box
Grammar checks
Use built-in AI, paid from Vibecode credits, to suggest corrections and explain them.
Works out of the box
Text rewrites
Let people choose a clearer, shorter, or more formal rewrite and tap to apply it.
Works out of the box
Keyboard in other apps
Add a custom iPhone keyboard, enable it in Settings, and test on a real iPhone with Apple's Developer Program.
Needs setup
A native iPhone app supports both a writing editor and a custom keyboard.
Plan ahead: Cloud AI in a keyboard needs Full Access permission, and some fields block custom keyboards, so explain text privacy and keep the in-app editor as a fallback.
Written by the checker for a first version. Paste it into Vibecode as is, or change it to make the app yours.
Build an iPhone app for people who want to fix grammar and improve their writing. Start with an in-app editor. The main screen should show a large text area with grammar suggestions below it. After a pause in typing, show suggested corrections with short explanations. Let me tap a suggestion to apply it or dismiss it. Add a Rewrite button with clearer, shorter, and more formal choices. Show the proposed rewrite before replacing my text. Use a clean white and soft blue design with readable type. Include realistic sample text and simulated suggestions so I can try the flow before connecting real AI.
Opens Vibecode with this prompt ready. Your first build is free.
Grammarly adds access to academic sources for plagiarism checks and years of work making writing assistance reliable across desktop apps.
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Can I vibe code Grok?Chatting with xAI's assistant, with image generation and real-time posts from XYesYes, you can build a grammar editor and add an iPhone keyboard for writing in other apps. You can build grammar checks, rewrite suggestions, and a custom keyboard. Start with an editor inside your app, then add the keyboard and test it on your iPhone. The keyboard can work with available text, but it cannot freely read other apps.
Vibecode builds a first version from one prompt, and the checker would start with these parts: an in-app writing editor; grammar suggestions with tap-to-apply corrections; clearer, shorter, and more formal rewrite options. Plan on a weekend for a working first version with its real features.
Vibecode's first build is free for new accounts that sign up with Google or Apple on the web or the iPhone app, as the account's first project: one build of about 10 minutes with up to 3 features, on sample data. After that you need credits, from a paid plan or auto-reload. For your own version of Grammarly, the checker lists these costs: Vibecode Plus ($20 a month); Apple Developer Program ($99 a year).
Grammarly adds access to academic sources for plagiarism checks and years of work making writing assistance reliable across desktop apps. A version you build yourself won't have these: ProQuest academic database access; Grammarly's model training data; years of desktop integration polish.
Grammarly's Pro plan costs $12 a month, billed yearly. That's from Grammarly's own site, checked on October 21, 2026.
Checked October 21, 2026 with the free Can I vibe code it? checkerGrammarly's price from its own site, checked the same day
Grammarly is a trademark of its owner. Vibecode isn't affiliated with or endorsed by Grammarly.
Start from the checker's prompt and get a first version you can tap through. Your first build is free. Got a twist on it? Check that idea first.