What? - AI Rewriter
Rewrite anything with AI
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
16 specialty packs — Writer's, Lawyer's, Coach's, Sales, Job Hunt, and more — are now free for everyone. Powered by Claude.
What? is an AI writing assistant powered by Claude. Paste any text, pick an action, get a polished result — in seconds, without leaving the app.
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14 BUILT-IN WRITING ACTIONS
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Fix Grammar · Rephrase · Make Professional · Make Casual · Shorten · Expand · Simplify · Translate (20 languages) · Humanize · Improve Flow · Make Punchy · Remove Hedging · More Assertive · Analyze Tone
Humanize strips AI tells — em-dashes, "delve," "leverage," "tapestry," "robust" — and rewrites with contractions, fragments, and varied rhythm so your text reads like a real person wrote it.
Pro subscribers get Claude Sonnet. The most capable model for nuanced edits.
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16 FREE ACTION PACKS — 160 SPECIALTY ACTIONS
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Every pack is free and included. No purchases, no paywalls, no limits.
Writer's Pack — vivid imagery, stronger openings, cliché removal, active voice
Lawyer's Pack — legal precision, plain English, protective hedging, demand letters
Marketer's Pack — headlines, A/B variants, CTAs, SEO, ad copy
Email Pack — match reply tone, cold emails, subject lines, TL;DR, follow-ups
Student Pack — academic tone, paraphrase, thesis, counterargument, study notes
Dating Pack — confident openers, banter, bio glow-up, let them down kindly
Recovery Pack — apologies, de-escalation, boundaries, make peace
Comedy Pack — stand-up style, dry wit, dark humor, roast, absurdist
Funny Pack — universal humor, dad jokes, meme-ready, one-liners, captions
International Pack — Japanese business, German direct, French polite, match any culture
Social Pack — tweet-ify, LinkedIn, Instagram captions, TikTok hooks, threads
Coach's Pack — reflective listening, reframe, SMART goals, hard feedback
Customer Support Pack — empathize, calm angry customers, explain policy, close tickets
Sales & Negotiation Pack — handle objections, follow up, close, counter-offer
Job Hunt Pack — resume bullets, cover letters, STAR answers, salary negotiation
Product & UX Writing Pack — microcopy, error messages, push notifications, button labels
MATCH ANY CULTURAL CONTEXT
Pick a country — Japan, Germany, France, Brazil, India, and 20 more — and the International Pack adapts your text to that culture's communication style without translating a word.
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WORKS EVERYWHERE
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Keyboard Extension — fix or rephrase in any app from your keyboard
Share Extension — select text anywhere, tap Share → What? to process it instantly
Home-Screen Widget — one tap from your home screen
iCloud Sync — history and settings stay in sync across all your devices
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BYOK — BRING YOUR OWN KEY
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Have an Anthropic API key? Use it directly. All Claude models, custom prompts, no monthly caps from us — you pay Anthropic per request. Your key lives in the iOS Keychain and never leaves your device.
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SUBSCRIPTION
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· 3-day free trial — no credit card upfront
· Pro — Claude Sonnet, Writing Coach mode, Before/After diff view, tone meter
· BYOK — your own Anthropic key, unlimited requests, custom-built actions
Payment is charged to your Apple ID at confirmation. Subscription renews automatically. Cancel anytime in Settings → Apple ID → Subscriptions.
Privacy Policy: https://sylvainlafrance.com/what/privacy
Terms of Use: https://sylvainlafrance.com/what/terms
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Bug fixes and under-the-hood improvements for a smoother experience.
The developer, Sylvain Lafrance, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Sylvain Lafrance
- Size
- 7 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - iPad
Requires iPadOS 18.6 or later. - Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 5 more
- English, French, German, Japanese, Simplified Chinese, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- What - Subscription Yearly $49.99
- What - Subscription Monthly $7.99
- What - BYOK Subscription Monthly $1.99
- What - BYOK Subscription Yearly $14.99
- Copyright
- © 2026, Sylvain Lafrance