Language models often get exact facts wrong: whether a page blocks an AI crawler, when a DMARC record is too weak, how many working days sit between two dates, what time a meeting falls in Tokyo, whether grey text passes contrast. Each of these five servers answers one of those exactly, from real data.
All five are remote servers. They run on the developer’s servers and you add them with one web address, so there is nothing to install, no account and no key.
| Server | Best for | Price |
|---|---|---|
| CrawlView | SEO audits and AI crawler access | Free |
| DomainProbe | SPF, DKIM, DMARC, DNS and certificates | Free |
| DayCount | Business days and public holidays | Free |
| HourLine | Time zones and meeting times | Free |
| HueProof | WCAG colour contrast and palettes | Free |
For websites and SEO
CrawlView
MCP server by Dude Lemon LLCBest forchecking a page the way search engines and AI crawlers see it
- A page audit with a ranked list of issues: titles, descriptions, canonical tags, robots rules and headings
- Shows which of 18 search and AI crawlers robots.txt lets in, with the exact rule that decides each one
- Checks structured data against Google’s rich result rules, and up to 40 links on a page
DomainProbe
MCP server by Dude Lemon LLCBest forchecking a domain’s email security and DNS in one question
- SPF with its DNS lookup count, DMARC policy and about 30 DKIM selectors, with a grade
- DNS records from two public resolvers, certificates on web and mail ports, and security headers
- Registrar, expiry and locks through RDAP
For dates and time
DayCount
MCP server by Dude Lemon LLCBest fordeadlines and schedules that depend on working days
- Adds or counts business days with the public holidays skipped, for about 200 countries and their regions
- Knows each country’s usual weekend, not just Saturday and Sunday
- Days, weeks, months and ISO weeks between two dates
HourLine
MCP server by Dude Lemon LLCBest formeetings and deadlines across time zones
- Converts any time between zones, with offsets, abbreviations and the day
- Finds every meeting slot inside everyone’s working hours, or the fairest options when none fits
- Knows the last and next clock changes, and the times that do not exist on those days
For design
HueProof
MCP server by Dude Lemon LLCBest forcolour choices that pass accessibility checks
- WCAG 2.2 contrast ratios with AA and AAA results, plus APCA
- Suggests the nearest colour that passes, keeping the hue
- Palettes in 11 steps, colour blindness checks and conversions between hex, rgb, hsl and OKLCH
Every MCP server, by category
Questions people ask
What is a good first MCP server?
One that answers something you check often and cannot get wrong by itself, such as time zones, business days or a page audit. Servers that only read data are the safest to start with.
How many MCP servers should I install?
As few as you need. Each server adds tools the assistant has to choose from; a handful of focused servers works better than dozens.
Do these servers work with ChatGPT?
Remote servers work with any assistant that supports remote MCP servers, including ChatGPT, the Claude apps, Claude Code, Cursor and VS Code.
Where do ratings come from?
Only from reviews written here by people we could verify. See how reviews are verified.
