Features
Everything you need. Nothing you don't.
GrammarDeck does one thing and does it well: it fixes grammar and spelling in the app you are already using. Here is everything it can do.
On your computer
One click, in any app
On a Mac, a small green tick appears at the end of the text you select. Click it and a card opens right next to your text with the fix. Prefer the keyboard? Press the shortcut instead.
- Works in Mail, Outlook, Slack, Teams, Word, Notion, Notes and almost any other app
- ⌃ Control⌥ OptionG on Mac, CtrlAltG on Windows and Linux
- Lives in the menu bar or the tray, out of your way
Clear changes
See what changed before it changes
Every correction is shown inline: removed words struck through in red, new words in green. You decide. Accept replaces your text; Copy puts the fixed version on your clipboard.
- Nothing is replaced until you click Accept
- “No mistakes found” when your text is already right
Their There is are three things we needs need to dicuss discuss before tommorow's tomorrow's meeting.
On your phone
A keyboard with a grammar button
The GrammarDeck keyboard for iPhone, iPad and Android works in every app you can type in. Write your message, tap ✓ Check, and send it with confidence.
- Tap a single fix, or Accept all to fix the whole message
- Text is sent only when you tap the button
- Never checks password fields, never records keystrokes
In your browser
An extension for Chrome, Edge and Firefox
Select text on any web page and click the GrammarDeck button that appears. Or right-click, or press AltShiftG.
- Accept replaces text in boxes and rich editors
- Copy works on any page, even text you can't edit
- Its look can't be broken by a page's own styles
- Reads the page only when you ask
Under the hood
Small details that add up
AI that reads the sentence
A modern language model understands what you meant, so it catches wrong words, not just misspelled ones.
Your voice, kept
It fixes mistakes and stops there. It does not rewrite text that is already correct, and keeps your emoji and line breaks.
A backup checker
If the AI is slow or busy, a rule-based checker answers instead, so you still get a fix.
Long text welcome
Check a line or a long email: up to 10,000 characters at a time.
One account everywhere
Sign in with Google, Apple or email. Your plan and your credits are shared across all your devices.
Monthly credits
One check of up to 50 words is 1 credit. Free includes 5 a day, up to 100 a month; Pro includes 5,000 a month, up to 1,000 a day.
Private by design
Text is processed in memory and never stored. Analytics and crash reports never include what you write.
Keyboard first
One shortcut checks the selected text, so you never have to reach for the mouse.
English today
GrammarDeck checks English now. More languages are on the way.
Try it in the app you use most.
Start free with 5 credits a day. No card needed.