kitio.aiGrammarly vs Perfect Tense
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Grammarly starts at $30/mo and Perfect Tense starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Grammar and spelling checks
- Tone detection
- Full-sentence rewrites
- Plagiarism checker
- Authorship tracking
- Grammar and spelling API
- Embeddable JavaScript library
- Automatic corrections
- Content quality data
- Rich text editor support
| Feature | Grammarly | Perfect Tense |
|---|---|---|
| Best for | Grammar, tone and rewrite suggestions in almost every app you type in | Spelling and grammar correction API and JavaScript library |
| Category | Writing | Writing |
| Pricing model | Freemium | Freemium |
| Starting price | $30/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | Superhuman Platform Inc. | Perfect Tense |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Grammarly starts at $30/mo and Perfect Tense starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- Spelling and grammar checks
- Tone detection
- 100 AI prompts
Pro
$30/mo
- Per member
- Full-sentence rewrites
- Tone adjustments
- Plagiarism and AI detection
Enterprise
Contact sales
- BYOK encryption
- Custom roles and permissions
- Data loss prevention
- Dedicated support
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Grammarly
- Works in nearly every app and website
- Free plan catches most basic errors
- Clear explanations for each suggestion
- Best features need the paid plan
- Can flatten a writer's personal style
- English only
Perfect Tense
- Two ways to integrate
- Can fix errors with no human effort
- Free sign-up without a card
- Built for developers, not end users
- Usage billed per text area load
- Language support not stated
Which one should you choose?
Choose Grammarly if you want:
- Works in nearly every app and website
- Free plan catches most basic errors
- Clear explanations for each suggestion
Watch out: best features need the paid plan.
Choose Perfect Tense if you want:
- Two ways to integrate
- Can fix errors with no human effort
- Free sign-up without a card
Watch out: built for developers, not end users.
Grammarly vs Perfect Tense FAQ
What is the difference between Grammarly and Perfect Tense?
Grammarly: Grammar, tone and rewrite suggestions in almost every app you type in. Perfect Tense: Spelling and grammar correction API and JavaScript library. Both are writing tools.
Is Grammarly or Perfect Tense cheaper?
Grammarly starts at $30/mo and Perfect Tense starts at See pricing page. Check both pricing pages for current plans.
Do Grammarly and Perfect Tense have free plans?
Grammarly: Yes. Perfect Tense: Yes.
Who makes Grammarly?
Grammarly is made by Superhuman Platform Inc., based in United States.
Who makes Perfect Tense?
Perfect Tense is made by Perfect Tense, based in United States.
Which should I choose, Grammarly or Perfect Tense?
Choose Grammarly if you value works in nearly every app and website and free plan catches most basic errors. Choose Perfect Tense if you value two ways to integrate and can fix errors with no human effort.