Quick Verdict
| Tool | Best For | Starting Price | Quality Score |
|---|
| Copy.ai | Value and collaboration | ¥349/mo ($49) | 8.0/10 |
| Jasper | Brand voice consistency | ¥499/mo ($69) | 8.8/10 |
| Writesonic | SEO-optimized content | ¥279/mo ($39) | 8.2/10 |
Feature Comparison
| Feature | Copy.ai | Jasper | Writesonic |
|---|
| Unlimited Words | ✅ $49/mo plan | ❌ (credit-based) | ❌ (word-based) |
| Brand Voice | Basic | ✅ Advanced (custom training) | Good |
| SEO Features | Basic | Good | ✅ Best-in-class |
| Long-Form | Good | Excellent | ✅ 10,000+ words |
| API Access | ✅ Yes | ✅ Yes | ✅ Yes |
| Language Support | 25+ | 30+ | 50+ |
| Templates | 100+ | 50+ | 70+ |
Real-World Test (Blog Post: 1,500 words)
| Metric | Copy.ai | Jasper | Writesonic |
|---|
| Time to Generate | 45s | 35s | 55s |
| Readability Score | 65/100 | 78/100 | 72/100 |
| SEO Keyword Usage | 1x target keyword | 3x target keyword | 5x target keyword |
| Human Editing Needed | 40% | 25% | 30% |
| Factual Accuracy | 85% | 90% | 88% |
Pricing
| Plan | Copy.ai | Jasper | Writesonic |
|---|
| Free | ❌ | ❌ | 10,000 words |
| Starter | $49/mo unlimited | $69/mo (120k words) | $39/mo (100k words) |
| Pro | $249/mo (workflows) | $129/mo (unlimited) | $79/mo (unlimited) |
| Enterprise | Custom | Custom | Custom |
Verdict
Best value: Copy.ai — unlimited words at $49/mo is hard to beat.
Best quality: Jasper — brand voice training produces the most on-brand content.
Best SEO: Writesonic — real-time SERP analysis + optimal keyword density.
Choose based on your primary need: volume, quality, or SEO performance.
