The offline grammar checker
that keeps your writing private.
Proofed uses Apple's on-device AI to fix grammar, spelling, and tone — without sending a single word to a server. No account. No internet. No compromise.
Free · 5 checks/day · No sign-up required
“have” → “has”
Your grammar checker is reading your writing.
Every major grammar tool sends your text to their servers — your emails, your cover letters, your private notes. They need an internet connection. They need an account. And they're using your writing to train their AI.
Proofed is different. It runs entirely on your iPhone, using Apple's on-device AI. Your writing never goes anywhere. Not to us. Not to Apple. Not to anyone.
Three steps. All on your device.
Paste or type your text
Open Proofed and add your writing — an email, an essay, a message. No character minimum. Up to 800 words per check.
Tap Check Grammar
Proofed's on-device AI analyzes your writing instantly. Grammar, spelling, punctuation, clarity — all checked without leaving your phone.
Review and fix
Tap any highlighted error to see what's wrong and why. Apply the fix with one tap, or fix everything at once.
Everything you need. Nothing you don't.
Grammar & Spelling Check
Catches grammar mistakes, spelling errors, punctuation problems, and clarity issues. Tap any highlight to see the correction and a plain-English explanation.
Works Offline, Always
No Wi-Fi. No data plan. No cloud. Proofed works in Airplane Mode. Perfect for flights, commutes, or anywhere your writing is most private.
Fix All in One Tap
Accept every suggestion at once with Fix All, or review corrections one by one. Undo anytime with a standard iOS gesture.
AI Text Rewrite
Tap Improve and Proofed rewrites your text for clarity, flow, and polish. See the original and rewritten version side by side. Accept or discard.
Tone Adjustment
Switch your writing between Formal, Neutral, and Casual with one tap. Instantly adapt emails for a client, a colleague, or a friend.
No Account, Ever
Download and use Proofed without creating an account, entering an email, or handing over any personal information. It's yours from the first tap.
Your writing is yours.
We built Proofed so it stays that way.
Proofed is an offline grammar checker for iPhone that processes all text locally using Apple's on-device Foundation Models AI. Unlike cloud-based grammar tools, Proofed never sends your writing to any server — not ours, not Apple's, not anyone's. There is no account, no analytics tracking your usage, and no data collection of any kind.
On-device processing
Apple's Foundation Models framework runs entirely on your iPhone. Your text is analyzed locally and discarded — it is never stored or transmitted.
No account required
Proofed has no login, no sign-up, and no user profile. There is nothing to link your identity to your usage. We don't know who you are, and that's intentional.
No analytics
We have not installed any analytics SDK in Proofed. We do not track sessions, feature usage, or crash data. The only third-party code is RevenueCat for subscription billing.
Start free. Upgrade when it makes sense.
No subscription required to try Proofed. 5 free grammar checks every day — no account, no credit card, no expiry.
Free
$0 / forever
- ✓5 grammar checks per day
- ✓Spelling correction
- ✓One-tap Fix All
- ✓No account required
- ✗AI text rewriting
- ✗Tone adjustment
- ✗Unlimited checks
Pro ⭐
$4.99 / month
or $29 / year — save 52%
- ✓Everything in Free
- ✓Unlimited grammar checks
- ✓AI text rewriting (Improve)
- ✓Tone adjustment (Formal / Neutral / Casual)
- ✓Priority support
Manage or cancel anytime in Apple ID settings.
Questions about Proofed
Does Proofed work offline?▾
Yes. Proofed uses Apple's on-device Foundation Models to check grammar entirely on your iPhone — no internet connection required. Your text never leaves your device. It works in Airplane Mode.
Does Proofed collect my data or read my writing?▾
No. Proofed processes all text locally using Apple's AI. Nothing is sent to any server. There are no accounts, no analytics on your writing, and no data collection of any kind. The only third-party code in the app is RevenueCat, which handles subscription billing — it never sees your text.
How is Proofed different from Grammarly?▾
Grammarly requires an internet connection, an account, and sends your text to cloud servers for processing. Proofed works completely offline using Apple's on-device AI. Your text stays on your iPhone. Proofed also does not require a subscription to start — 5 free checks per day, no sign-up.
What does Proofed check for?▾
Proofed checks grammar, spelling, punctuation, and sentence clarity. Pro users also get AI text rewriting (to improve flow and readability) and tone adjustment between Formal, Neutral, and Casual writing styles.
Which iPhones support Proofed?▾
Proofed's AI features require Apple Intelligence, available on iPhone 15 Pro, iPhone 15 Pro Max, iPhone 16 series, and later models running iOS 26. Basic spelling checks work on other supported devices.
Is there a free version of Proofed?▾
Yes. Proofed is free to download with no sign-up required. The free tier includes 5 grammar and spelling checks per day. Proofed Pro ($4.99/month or $29/year) adds unlimited checks, AI text rewriting, and tone adjustment.
Can I use Proofed on my iPad or Mac?▾
Proofed v1 is iPhone-only. iPad and Mac support is planned for a future update.
What language does Proofed support?▾
Proofed currently supports English. Additional languages are planned for a future update.
Built in public. Every decision documented.
Proofed is built by an indie developer and documented openly — the code decisions, the product mistakes, and the real numbers after launch. Follow the journey:
⭐⭐⭐⭐⭐
“Finally — a grammar checker I trust.”
App Store review
⭐⭐⭐⭐⭐
“Works perfectly offline. Deleted Grammarly.”
App Store review
⭐⭐⭐⭐⭐
“Simple, fast, private. Exactly what I needed.”
App Store review
Ready to write privately?
Free to start. No sign-up. Works offline immediately.
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