They bring the data. OnPage.dev closes the loop.

Built for data, or built to close the loop

The SEO MCP servers from Ahrefs, Semrush, SE Ranking and DataForSEO are built for data. They tell your assistant what ranks, who links and what people search. Then the real work starts: find the cause, write the fix, ship it and prove it paid off. That is where OnPage.dev takes over, inside the same chat.

Step 1 · Data MCPsDataRankings, keywords, backlinks, clicks

Passed to OnPage.dev

OnPage.dev takes over

2. 2FindWhat is wrong for Google and AI search
3. 3FixCode written from the page itself
4. 4CheckUnpublished HTML, before you deploy
5. 5ShipWordPress, or a Git pull request
6. 6NotifyIndexNow and URL Inspection
7. 7ProveClicks won, against pages you did not touch

↻ The results flow back into your data, and the loop starts again.

What happens after the data

Step by step, with the OnPage.dev tool that does it. The data servers are excellent at what they are made for. These steps are simply not their job.

Step	OnPage.dev	Data MCPs
Search data: rankings, keywords, backlinks	Uses yours, from Search Console, GA4, Ahrefs or Semrush in the same chat	Their core strength
Find what is wrong on the page	scan_page, deep_audit, render_page: Google, AI search, speed, accessibility	Site audit data in some of them
Write the fix from the page itself	get_fix_pack, generate_schema: titles, descriptions, canonicals, JSON-LD	Not what they are built for
Ship it where the code lives	Yoast SEO and Rank Math fields, or a Git pull request for Next.js, Nuxt, SvelteKit, Astro, Angular, React or Vue	Not what they are built for
Check it before deploy	scan_html and compare_html on unpublished HTML	Not what they are built for
Tell search engines	submit_indexnow, plus URL Inspection through your Search Console	Not what they are built for
Prove the result	measure_impact: before and after, against pages you did not touch	Their numbers are the input
Keep watching	watch_page: alerts by RSS or webhook when a noindex or redirect sneaks in	Rank tracking in some of them
Price to start	Free. No account, no API key	A paid plan or prepaid credits

Same question, two answers

An example of what each kind of server gives back when you ask about a page that does not rank.

/pricing ranks #14
"seo tool pricing": 1.2k a month
3 referring domains
Top 3 results: 40+ each

Title cut off, no canonical
Pricing section skips the answer
Fix in Next.js, checked: 58 → 91
Pull request #42 opened
IndexNow sent
4 weeks: +38% clicks (others +4%)

Every layer, in one server

47 tools, grouped by the job they do. All free, all in one connection.

Built on 24 years of SEO

OnPage.dev is built by an SEO specialist with 24 years of hands-on experience, from the early days of Google to AI search. The checks and fixes come from real client work, not from a generic checklist. Every check, its weight and its reason are on the methodology page, so you can explain a score to a client and defend it.

Price and access

Server	Price to start	Billing	What it brings	Built for
OnPage.dev	Free. No account, no API key	Free, with fair-use limits	Checks of your own pages: SEO, AI search, speed, accessibility	Finding, fixing and shipping fixes, then proving the result
Ahrefs MCP	Lite plan or higher, from $129 a month	API units from your plan	Backlinks, keywords, rankings and site audit data from Ahrefs	Research: who links to you and what ranks
Semrush MCP	Semrush One Starter or Pro+, SEO Classic Pro or Guru, or a Trends API plan	50,000 API units a month, more in packages	SEO and Trends data, read-only access to your Projects	Competitive and market research
SE Ranking MCP	Any plan, from $103.20 a month billed yearly, or a $50 API deposit	API credits	180+ tools: keywords, backlinks, audits, rankings, AI search visibility	Day-to-day SEO on SE Ranking data
DataForSEO MCP	$50 minimum deposit	Pay per request	SERP, keyword, backlink and on-page APIs	Developers and bulk pipelines

Prices and plans as the vendors list them, checked on 8 October 2026. They change, so check the vendor before you buy: Ahrefs, Semrush, SE Ranking, DataForSEO.

Better together

OnPage.dev has no search volumes, rankings or backlinks of its own, on purpose. Connect Ahrefs, Semrush, SE Ranking, DataForSEO or Google Search Console in the same chat, and OnPage.dev turns their numbers into work:

• prioritize_fixes ranks every fix by the traffic, conversions or revenue it can win.
• map_topics turns Search Console queries into topics, with the page that owns each one.
• match_intent and check_answer_format check your page against the pages that rank.
• compare_ai_citations takes AI citation counts, for example from Ahrefs Brand Radar, and shows what cited pages do differently.
• measure_impact reads the before and after numbers to prove a fix worked.

Fetch our top 10 pages and their queries from Ahrefs,
rank the fixes with OnPage.dev, fix the top three
and open a pull request.

Which one should you use?

• You want pages that rank and get cited, not just reports: OnPage.dev, free.
• You research backlinks and keywords: Ahrefs or Semrush, on a plan you may already pay for.
• You run day-to-day SEO for clients on one platform: SE Ranking.
• You build pipelines and pay per call: DataForSEO.
• You want data and results: connect OnPage.dev next to any of them. That is where it shines.