Semrush is one of the two names everyone reaches for when they think SEO data, and its MCP server brings that data into Claude and ChatGPT. ContextBolt SEO is the standalone hosted server I built, for people who want the same class of data without the dashboard subscription.
Full disclosure since you are reading this on the ContextBolt site. I make one of these two products. With that bias on the table, here is the honest comparison. I will tell you where Semrush MCP wins outright, and where it does not.
- Semrush MCP ships as a feature of any paid Semrush plan, from $139 a month. The Semrush database, piped into your agent, with a native ChatGPT connector.
- ContextBolt SEO is a $35 a month standalone hosted server. The core tools span keywords, backlinks, site audits and AI visibility, plus a free Search Console connection, cross-session memory and a filesystem mirror to your project.
- Coverage. Both cover keyword, SERP, domain, competitor, and backlink research. Semrush goes deeper.
- Setup. Semrush MCP needs a Semrush account and a paid plan. ContextBolt SEO needs one MCP URL pasted into your agent.
- Pick by what you already pay for. If you have Semrush, use theirs. If you do not, ContextBolt SEO is the lighter standalone path.
Pricing and access were checked against Semrush’s official pricing and MCP documentation on August 19, 2026. Semrush SEO Toolkit Pro is $139 a month when paid monthly, or $117.33 a month billed annually. ContextBolt SEO is $35 a month after a 7-day free trial.
What Semrush MCP is
Semrush MCP is the official Semrush server. It pipes the keyword, traffic, and competitive data behind the Semrush platform into Claude and ChatGPT through the Model Context Protocol. It supports OAuth by default with API key auth as a fallback, and it shows up as a built-in connector inside ChatGPT for Plus, Pro, and Business users. The community version of the server exposes upward of 70 tools for people who want the full surface.
That ChatGPT connector is the standout. For a lot of people, “set up an MCP server” still sounds like a config-file chore. With Semrush, ChatGPT users flip on a connector and start asking about rankings and competitors with nothing to install.
The data behind it is the real draw. Semrush has one of the largest keyword databases in the industry, deep competitive intel, and a serious backlink index. The catch is the price model. Semrush MCP is available on the paid plans, which start at $139 a month, and the MCP draws on your plan’s API units. The MCP is a feature of the subscription, not a cheaper way in. You are paying platform prices and getting agent access on top.
What ContextBolt SEO does differently
ContextBolt SEO is a hosted standalone SEO MCP server. You subscribe, you get one MCP URL, and you paste it into Claude, Cursor, or Windsurf. There is no Semrush subscription to hold, no data account to register, and nothing to install.
The tools cover the same surface most people use Semrush for. Keyword and SERP research, domain and competitor analysis, backlinks, page and site audits, and AI visibility cover the day-to-day work. The AI tools include live ChatGPT or Gemini answers with their cited sources. Your own Google Search Console connects free and costs no credits. The data sits on DataForSEO, the same wholesale layer that powers a long list of SEO products. The estimates are directional and useful for decisions, but they are not identical to Semrush’s first-party numbers.
Two things ContextBolt SEO does that Semrush MCP does not. Cross-session memory: Ask about the same keyword next week and the answer leads with what has changed since last time, automatically, with no extra prompt or credit. Something like “difficulty has gone from 47 to 52 and search volume from 4.4K to 4.9K a month, since you last looked 8 days ago.” Findings saved to your project: Every lookup writes a markdown file into a ./seo-findings/ folder, so your research lives where you already work and you can search, commit, or open it in Obsidian. The folder is curated so it stays tidy with use. The same lookups also fill your SEO Board, a private page you can open or share as a link, so going agent-first does not mean giving up somewhere to look.
Pricing is $35 a month for 1,000 research lookups. Memory and the project folder are free and do not count against the cap.
The honest gap
The bigger ecosystem context, including Ahrefs, DataForSEO, and the free Google servers, is in the full comparison of the six leading SEO MCP servers.
The data depth is the honest gap in ContextBolt SEO, and so is the missing native ChatGPT connector. The rest of the comparison comes down to the same two questions every SEO tool decision does. What are you already paying for, and how much of the dashboard surface do you actually use. Answer those and the right pick falls out.
Where each one wins
- No $139 platform bill
$35 a month for 1,000 lookups against roughly $1,668 a year, for the founder or marketer who does SEO in bursts.
- One URL is the whole setup
Semrush MCP needs an account, a paid plan and the connection on top. This is one MCP URL pasted into Claude or Cursor.
- It remembers, and it writes files
Semrush MCP is stateless like every other SEO MCP. This one leads with what changed and mirrors each finding into ./seo-findings/.
- The deepest data
Years of first-party keyword and backlink indexing. On a hard question in a competitive niche it has more to draw on than an estimate layer.
- You are already paying for it
If Semrush is already in your stack the MCP is included. Switching saves nothing and adds a second tool.
- The ChatGPT connector
The smoothest setup in this category: authenticate once, no config file. ContextBolt SEO covers Claude, Cursor and Windsurf today.
Which one is for you?
Tick what you actually need. Every line already shows which tool wins it, so this works with or without the ticking.
4 of these 9 point to ContextBolt SEO, 4 to Semrush MCP. Tick the ones that are true for you.
ContextBolt SEO vs Semrush MCP: feature comparison
| Feature | ContextBolt SEO | Semrush MCP |
|---|---|---|
| Price | $139+/mo Semrush plan | |
| Standalone (no other subscription) | No, needs Semrush plan | |
| Keyword research, difficulty, SERP | Yes | Yes |
| Domain and competitor analysis | Yes | Yes |
| Data depth | Ahrefs-grade estimates | |
| Backlink data | Overview, referring domains, gap | |
| Cross-session memory | Stateless lookups | |
| Findings saved as files to your project | No | |
| Works in ChatGPT natively | Remote MCP where supported; no directory app | |
| Setup | Semrush account, plan, then connect | |
| Usage cap | 1,000 research lookups/mo | Plan API units |
No features in that group.
8 of 11 features actually differ.