Updated March 2026 · Independent Analysis
QuillBotvsAI21 Studio
QuillBot starts at $13/mo, 67% cheaper than AI21 Studio's $39/mo. QuillBot is rated higher at 4.6/5 vs AI21 Studio's 4.4/5.
QuillBotvs AI21 Studio
★ 4.6/5+0.2 vs AI21 Studio
Only in QuillBot
- ✦ Paraphrasing tool
- ✦ Grammar checker
- ✦ Plagiarism checker
✓ Free planFrom $13/mo(cheaper)35M+ users · est. 2017
Try QuillBot Free →
AI21 Studiovs QuillBot
★ 4.4/5-0.2 vs QuillBot
Only in AI21 Studio
- ✦ Jurassic-2 models
- ✦ Text generation
- ✦ Summarization
✓ Free planFrom $39/mo(pricier)500K+ users · est. 2017
Try AI21 Studio Free →Ratings Breakdown
QuillBot
4.6/5 avg
G2 Score4.6/5
Capterra Score4.7/5
G2 Rating4.6/5
AI21 Studio
4.4/5 avg
G2 Score4.4/5
Capterra Score4.3/5
G2 Rating4.4/5
Quick Stats
Free Plan
QuillBotYes ✓
AI21 StudioYes ✓
Feature Comparison
QuillBot uniquely offers Paraphrasing tool, Grammar checker, Plagiarism checker. AI21 Studio uniquely offers Jurassic-2 models, Text generation, Summarization. Both share 0 features.
Feature
QuillBot
AI21 Studio
Paraphrasing tool
✓
✗
Grammar checker
✓
✗
Plagiarism checker
✓
✗
Citation generator
✓
✗
Summarizer
✓
✗
Co-writer
✓
✗
Translator
✓
✗
Word flipper modes
✓
✗
MS Word add-in
✓
✗
Chrome extension
✓
✗
Flow mode
✓
✗
Compare modes
✓
✗
Jurassic-2 models
✗
✓
Text generation
✗
✓
Summarization
✗
✓
Paraphrasing API
✗
✓
Contextual answers
✗
✓
Custom model tuning
✗
✓
Segmentation
✗
✓
Task-specific APIs
✗
✓
Playground
✗
✓
Fine-tuning
✗
✓
Document understanding
✗
✓
RAG capabilities
✗
✓
Total Features
12
12
Quick Verdict
Independent analysis based on features, pricing, and user ratings
Choose QuillBot if you need:
- ✓ Paraphrasing tool
- ✓ Grammar checker
- ✓ Plagiarism checker
- ✓ Citation generator
- ✓ Summarizer
Choose AI21 Studio if you need:
- ✓ Jurassic-2 models
- ✓ Text generation
- ✓ Summarization
- ✓ Paraphrasing API
- ✓ Contextual answers
Pricing Comparison
QuillBot starts at $13/mo, 67% cheaper than AI21 Studio's $39/mo.
QuillBot Plans
Free tier available
Free
Free- • 125 words/paraphrase
- • 3 modes
- • Grammar checker
PremiumBest Value
$13/mo- • Unlimited length
- • All 8 modes
- • Plagiarism checker
AI21 Studio Plans
Free tier available
Free
Free- • $10 free credits
- • Playground access
- • Basic APIs
TeamsBest Value
$39/mo- • Production APIs
- • Fine-tuning
- • Team collaboration
Enterprise
Custom- • Custom models
- • SLA
- • Dedicated support
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