Bench test · AI SEO
SEMrush Writing Assistant vs RankMath
Same rack, same rubric, four independent agents. Here's how they measure up — and which we'd pick.
| SEMrush Writing Assistant | RankMath | |
|---|---|---|
| consensus | score8.4/10 | score8.5/10 |
| agents won | 1 / 4 | 2 / 4 ▲ |
| from | Custom | Custom |
| free tier | no | no |
| category | AI SEO | AI SEO |
Agent panel — head to head
| Anthropic | 7.8 | 8.2 ▲ |
| OpenAI | 8.5 | 8.5 |
| Gemini | 9.1 | 9.3 ▲ |
| Grok | 8.3 ▲ | 8.0 |
SEMrush Writing Assistant
- ✓Combines writing and SEO optimization in one tool
- ✓Integrates with broader SEMrush suite
- ✓Actionable, data-driven feedback
- —Requires SEMrush subscription
- —Learning curve for feature navigation
- —SEO focus may overwhelm general writers
Real-time SEO recommendationsReadability and tone analysisAI-powered content generationPlagiarism detectionGrammar and style checkingKeyword optimization suggestions
RankMath
- ✓Comprehensive all-in-one SEO solution
- ✓User-friendly interface with actionable recommendations
- ✓Competitive pricing with free tier available
- —Can be overwhelming for beginners with many features
- —Some advanced features require premium subscription
- —Occasional conflicts with other WordPress plugins
AI-powered content analysis and optimizationTechnical SEO auditing and fixesKeyword rank trackingSchema markup generationXML sitemap managementBulk content optimization
Custom · no free tier
Try SEMrush Writing Assistant ▸Custom · no free tier
Try RankMath ▸Verdict
RankMath takes it — 8.5 to 8.4 (a photo finish).
The panel gave RankMath the edge on 2 of 4 agents. It's close enough that SEMrush Writing Assistant is a fair pick if it fits your workflow better.