Free Grammar & Tone Checker
Check grammar, spelling, and tone before you hit send.
Without changing your voice.
✓ Free to use ✓ No sign-up required ✓ Privacy-first
You've been there.
Hovering over the send button. Wondering if that message sounds too harsh. Too blunt. Or has a typo.
So you copy it. Paste into ChatGPT. Ask "does this sound okay?" Copy the response. Paste back. Send.
That's 6 steps for a 2-second message.
One tap. Instant grammar & tone check.
ToneCheck analyzes your message for grammar mistakes, spelling errors, and tone issues— without rewriting your words.
Try Our Free Grammar & Tone Checker
Grammar Check in Any App
Use the ToneCheck keyboard to check grammar, spelling, and tone directly in WhatsApp, Slack, iMessage, Email, and more.
Clean, focused interface
Instant grammar & tone analysis
One-tap auto fix
Works in any messaging app
More Than a Grammar Checker
Grammar Check
Catch grammar mistakes, subject-verb agreement issues, and sentence structure problems instantly.
Spelling Check
Fix typos and spelling errors before they make you look unprofessional.
Tone Analysis
Know if your message sounds too harsh, passive-aggressive, or might be misunderstood.
Preserves Your Voice
We don't turn you into a corporate robot. Your words stay yours.
Works Everywhere
Slack, WhatsApp, iMessage, Email. One tap from any app.
Private by Design
Messages are never stored. Never used for training. Ever.
❌ Other Grammar Checkers
- Rewrite your entire message
- Make you sound like HR
- Overwhelming suggestions
- Require switching apps
✅ ToneCheck
- Only flags real issues
- Keeps your authentic voice
- Grammar, spelling & tone in one
- Works inside any app
Frequently Asked Questions
What is ToneCheck?
ToneCheck is a free AI-powered grammar checker, spelling checker, and tone analyzer. It helps you send messages with confidence by checking for grammar mistakes, spelling errors, and tone issues before you hit send - without rewriting your words.
Is ToneCheck free to use?
Yes! ToneCheck offers a free plan with 15 checks per day, which includes full grammar, spelling, and tone analysis. For power users, the Pro plan offers 200 checks per day for $5/month.
How does ToneCheck work?
ToneCheck uses advanced AI to analyze your messages for grammar mistakes, spelling errors, and tone issues. Unlike other tools, it doesn't rewrite your entire message - it only flags potential problems and lets you decide whether to fix them.
Does it work on WhatsApp, Slack, and other apps?
Yes! ToneCheck includes a custom iOS keyboard that works in any app - WhatsApp, Slack, iMessage, Email, LinkedIn, and more. Just switch to the ToneCheck keyboard and tap 'Check Tone' before sending.
Is my data private?
Absolutely. Your messages are processed securely and are never stored or used for AI training. Privacy is core to our design - we believe your words should stay yours.
How is ToneCheck different from Grammarly?
While Grammarly rewrites your messages to sound "correct," ToneCheck preserves your authentic voice. We only flag genuine issues and give you the choice to fix them - no corporate-speak transformations.
Free Grammar & Tone Checking
Free
For casual checking
- ✓ Grammar check
- ✓ Spelling check
- ✓ Tone analysis
- ✓ Auto-fix suggestions
- ✓ iOS keyboard
- 15 checks per day
Pro
For daily confidence
- ✓ Grammar check
- ✓ Spelling check
- ✓ Tone analysis
- ✓ Auto-fix suggestions
- ✓ iOS keyboard
- 200 checks per day
Ready to send with confidence?
Download ToneCheck for iOS and never second-guess a message again. Free grammar check, spelling check, and tone analysis.
Free forever. Pro plan for power users.