Research. Write. Refine.
Best AI Tools for SEO
Compare Surfer, Frase, Semrush Content Toolkit and ChatGPT for content research, briefs and optimization. Choose by workflow, price and the limits that matter.
By Discover the Tools · Sources checked
Compare the toolsThe shortlist
Four tools. Different strengths.
Pick the workflow closest to your next project.
Surfer
Document limits depend on the plan
$49/month equivalentDiscovery · billed yearly ($588/year)See the fit and limits A small content operation
Frase
Starter: one seat, one site, 10 articles/month
$49/monthStarter · monthly; $39/month billed yearly ($468/year)See the fit and limits SEO-informed briefs and drafting
Semrush Content Toolkit
Five SEO content boosts/month
$60/month shownBase · pricing page displays annual billing; confirm at checkoutSee the fit and limits Working from your own researchChatGPT
Supply and check your SEO evidence
Free; Plus $20/monthPlus billed monthly; API charged separatelySee the fit and limitsAt a glance
Pricing and practical limits
Prices in USD. Annual billing is labelled explicitly. Taxes, regional prices and checkout terms may differ. On a small screen, swipe the table to compare.
| Tool / best fit | Price & billing | Free access / trial | Check before choosing |
|---|---|---|---|
| SurferContent optimization | $49/month equivalentDiscovery · billed yearly ($588/year)Official plan details ↗ | Paid subscription; check trial terms | Document limits depend on the plan |
| FraseA small content operation | $49/monthStarter · monthly; $39/month billed yearly ($468/year)Official plan details ↗ | 7-day trial; no credit card | Starter: one seat, one site, 10 articles/month |
| Semrush Content ToolkitSEO-informed briefs and drafting | $60/month shownBase · pricing page displays annual billing; confirm at checkoutOfficial plan details ↗ | 7-day trial listed in vendor help | Five SEO content boosts/month |
| ChatGPTWorking from your own research | Free; Plus $20/monthPlus billed monthly; API charged separatelyOfficial plan details ↗ | Free plan with usage limits | Supply and check your SEO evidence |
Make a choice
Which tool fits your work?
Surfer
$49/month equivalent
Discovery · billed yearly ($588/year)
Consider Surfer when you have a page to improve and want focused optimization guidance. Discovery includes AI SEO guidance and the Surfy assistant; compare the document allowance with your publishing workload before committing.
Discovery is the entry content plan. Collaboration and other capabilities appear in higher tiers. Treat optimization suggestions as editing input: adding terms to a page does not prove it answers the reader’s question.
Sources: Surfer plans and included features
Frase
$49/month
Starter · monthly; $39/month billed yearly ($468/year)
Shortlist Frase if one person needs research, content optimization and publishing in one place. Starter supports a single site and connects to publishing platforms including WordPress and Webflow.
Starter caps usage at its monthly limits. More seats, sites and articles require a larger plan. Review facts, sources and brand claims before allowing an agent to publish for you.
Sources: Frase pricing and limits
Semrush Content Toolkit
$60/month shown
Base · pricing page displays annual billing; confirm at checkout
Consider this toolkit when you want topic ideas, SEO briefs and drafting together. Its topic and brief tools use Semrush data, with content optimization and brand-voice features in the same workflow.
The Content Toolkit is a specific product, not a purchase of every Semrush toolkit. SEO boosts have a separate allowance. The pricing page and help article describe standard-article allowances differently; confirm billing and included usage before subscribing.
Sources: Semrush Content Toolkit pricing · Semrush Content Toolkit help and limits
ChatGPT
Free; Plus $20/month
Plus billed monthly; API charged separately
A flexible starting point for turning your own notes into outlines, rewriting unclear passages and reviewing a draft. Free access lets you try the workflow; Plus offers higher limits and broader tools.
Treat suggested keywords and search intent as hypotheses to verify. A generated answer is not evidence of search volume or ranking difficulty. File, research and message limits depend on the plan and account.
Sources: OpenAI Free Tier FAQ · ChatGPT Plus pricing and limits
A practical starting point
Make your first comparison useful.
A focused task helps you judge fit before you commit to a subscription.
- Choose one real task. Use an existing article that needs a clearer answer, or a brief you need to give a writer. Match the tool to that task before comparing subscriptions.
- Bring reliable inputs. Prepare the audience, source material and examples of the questions you need to answer. Keep source links beside factual claims throughout drafting.
- Review before publishing. Check accuracy, usefulness, duplication and readability. Use a separate technical audit when the problem is crawling, indexing or site performance.
Common questions
Before you sign up
Which AI SEO tool should a small business start with?
Start with ChatGPT if you already have reliable research and mainly need drafting help. Compare Frase for a single-site content workflow, Surfer for optimization, and Semrush Content Toolkit for data-informed briefs. These are editorial matches to different jobs, not measured performance rankings.
Can these tools guarantee a first-page Google ranking?
No. A content score or generated draft is not a ranking guarantee. These tools can assist with content work; the finished page still needs to answer a real question accurately and be accessible to search engines.
Do I need a separate keyword or technical SEO tool?
Possibly. Check whether your selected plan includes the keyword data, site auditing and other capabilities your task needs. This shortlist focuses on AI-assisted content work and is not an exhaustive comparison of technical SEO platforms.
Why do some prices say “billed yearly”?
An annual price expressed per month usually requires an annual commitment. For example, Surfer Discovery’s listed $49 monthly equivalent is $588 for a year. Compare the full commitment and usage limits, not just the headline monthly figure.