For iPhone · 12 languages · No account

Make AI text sound human.

Grubby AI takes a draft from ChatGPT or any other AI and rewrites it in plain, natural language. Paste it in, pick a tone, slide to Humanize. That's the whole app.

Download on the App Store How it works

iOS 18 or later. No account, no email, no password.

The Grubby AI editor with a pasted paragraph, the tone set to Natural, and the Humanize Text slider
12

Languages, in the app and in every rewrite

4

AI detectors the rewrite is optimized for

0

Texts stored. Yours is encrypted and not kept

How it works

Three steps, one slide.

01

Paste your text

Or import a PDF, Word, TXT or RTF file. Anything over 50 words works; 100 words or more gives the best rewrite.

02

Pick a tone

Natural, Casual, Professional or Academic. The app remembers the one you used last time. Language is detected on its own.

03

Slide to Humanize

Compare with the original, switch on Show Changes, then copy, share or export. Not happy? Try Again, or Adjust the tone.

A look inside

Straight from the app, not mockups.

The editor screen

The editor

Paste, type, or import a file. Your word balance sits at the top.

The result screen with the Humanized and Original tabs and the human score

The result

The original one swipe away, a count of what changed, and the detectors the rewrite is tuned for.

The History screen listing past rewrites

History

Every rewrite, searchable, kept only on your phone.

After dark

Reads just as well at night.

A warm charcoal appearance that follows your iPhone, or a switch in Settings if you'd rather choose.

The result screen in dark mode

What's in the app

Everything a rewrite needs.

  • Four tones: Natural, Casual, Professional and Academic
  • 12 languages, detected automatically: English, Arabic, German, Spanish, French, Italian, Japanese, Korean, Dutch, Portuguese, Turkish and Simplified Chinese
  • Import PDF, DOCX, TXT and RTF files
  • Export to TXT, PDF or Word, or share to any app
  • Show Changes highlights every rewritten phrase
  • Try Again and Adjust, with every version kept
  • Searchable History, stored only on your phone
  • Quick Humanize shortcut for Siri, Spotlight, the Shortcuts app and the Action button
  • Home Screen widget with Humanize, Paste & Humanize, History and Settings
  • Drafts autosave, and a full-screen editor for long pieces
  • Light and dark appearance
  • The app itself is translated into all 12 languages

About AI detectors. We tune rewrites for GPTZero, Copyleaks, Originality.ai and Turnitin. We don't run those tools ourselves, so we can't promise a score, and results vary by detector. What we can promise is text that reads like a person wrote it.

Privacy

We don't keep your text.

Your text goes to our server over an encrypted connection, gets rewritten, and comes back. We don't store it. Only a word count is recorded against your plan. A finished result is cached for up to an hour so a retry is never charged twice, then it's deleted.

There's no account to create. Your plan follows your App Store purchase, so a new phone or a reinstall picks up where you left off. Drafts and History live on your phone and nowhere else.

Read the full Privacy Policy
The Settings screen with the plan card and privacy links

Pricing

One plan, three rhythms.

Each plan comes with a word allowance that resets every period. Words are counted from the text you send; a rewrite that fails costs nothing.

Weekly

$7.99/ week
  • 2,000 words per week
  • All four tones, all 12 languages
  • Cancel any time
Get the app

Monthly

Most popular
$14.99/ month
  • 10,000 words per month
  • All four tones, all 12 languages
  • Cancel any time
Get the app

Yearly

$84.99/ year
  • 15,000 words every month
  • All four tones, all 12 languages
  • Cancel any time
Get the app

Prices in US dollars. The App Store shows the price for your country. Subscriptions are billed by Apple and renew automatically until cancelled in your Apple ID settings. Unused words don't carry over. The editor, file import, History and settings work without a plan.

FAQ

Questions people ask.

Rewrites are tuned for GPTZero, Copyleaks, Originality.ai and Turnitin. We don't run those tools and no app can honestly promise a score. Results vary by detector and by text. Think of Grubby AI as a way to make writing read naturally, not as a guarantee.

No. It's sent over an encrypted connection to be rewritten and isn't stored. A finished result is cached for up to an hour so a retried request isn't charged twice, then deleted. History stays on your phone.

No sign-up, no email, no password. Your plan is tied to your App Store purchase. On a new phone, open the app once and tap Restore Purchases in Settings.

Texts need at least 50 words. Between 50 and 99 words the app warns that short texts rewrite less reliably. From 100 words up you get the best results.

English, Arabic, German, Spanish, French, Italian, Japanese, Korean, Dutch, Portuguese, Turkish and Simplified Chinese. The language is detected automatically and the rewrite comes back in the same one. The app is translated into all twelve too.

By the text you send. Every Humanize, Try Again and Adjust spends the word count of the input. A failed rewrite costs nothing, and retrying it is never charged twice. Allowances reset at the start of each period.

Cancel from Settings → Manage Subscription in the app, or from your iPhone's Apple ID subscriptions. Apple handles billing and refunds; ask for a refund at reportaproblem.apple.com.

iPhone, on iOS 18 or later.

Paste something. See for yourself.

The editor, file import and History are free to try.

Download on the App Store