Grammarly
The default AI writing assistant, offering grammar, clarity and tone checks across most apps.
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On-page SEO optimization tool that benchmarks drafts against top search results in real time.
Surfer
On-page SEO optimization tool that benchmarks drafts against top search results in real time.
Surfer is a leading tool in content optimization. Its Content Editor analyzes top-ranking pages for a keyword and produces a score based on term usage, structure and topical coverage, updating as the writer edits.
Compared with Frase, which emphasizes research and brief creation at a lower price, Surfer is stronger on optimization scoring and auditing of existing pages. It also offers AI article generation, though its main appeal remains guidance for human writers.
Plans start at $99 per month, positioning it for agencies and in-house SEO teams rather than hobbyists. The key trade-off is that correlation-based scoring is a proxy, not a ranking guarantee, and overly literal adherence produces formulaic prose.
Best fit: Agencies and in-house SEO teams with steady publishing volume
Standardizing on-page SEO across a content team
Auditing underperforming pages for gaps
Setting measurable targets in writer briefs
Prices last checked Mar 3, 2025. Spotted an error? Let us know.
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On-page SEO optimization tool that benchmarks drafts against top search results in real time. Best for agencies and in-house SEO teams with steady publishing volume.
From $99/mo (paid).
Writesonic and Frase.
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