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Cron Explainer MCP Server

by idoazacalls Your server? Claim it
answering

Cron Explainer is answering right now. Last checked 15 min ago. It exposes 1 tools. Last commit 23 Apr 2026.

Cron expression parser: explains any cron + returns next N fire times. Timezone-aware.

Uptime history 91 days of history · worst day 91%
91 days agonow
100.0%
Uptime 24h
91 of 91 checks
1
Tools
read from the server
115 ms
Response time
average over 24h
0
Stars
last commit 23 Apr 2026

Nothing serious here today

Today is the operative word: we check Cron Explainer every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 15 min ago.

run in your terminal
claude mcp add cron-explainer --transport http https://cron-explainer.cron-explainer-prod.workers.dev/mcp
Settings → Connectors → Add custom connector, then paste this address
https://cron-explainer.cron-explainer-prod.workers.dev/mcp
~/.codex/config.toml
[mcp_servers.cron-explainer]
url = "https://cron-explainer.cron-explainer-prod.workers.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "cron-explainer": {
      "url": "https://cron-explainer.cron-explainer-prod.workers.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "cron-explainer": {
      "type": "http",
      "url": "https://cron-explainer.cron-explainer-prod.workers.dev/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

explain
explain_cron
Parse a POSIX/Vixie cron expression and return the next N fire times plus an English description. Timezone-aware (IANA). Best-effort accuracy. Billed at 1 EUR cent per successful call; non-2xx responses are refunded.

Endpoints

URLTransportStateLatencyChecked
https://cron-explainer.cron-explainer-prod.workers.dev/mcp streamable-http answering 95 ms 15 min ago

Alternatives to Cron Explainer

same job, measured the same way
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Tick
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Tempo Cron Explorer
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Cron runs across timezones

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Cron Forge MCP
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Build, explain, and validate cron expressions

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Cron
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MCP server for cron expression parsing, validation, and scheduling.

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Cron Explainer — questions

Answers built from our own checks of this server.

What can Cron Explainer do?
It exposes 1 tools, read directly from the server on our last check. Among them: explain_cron. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Cron Explainer working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 115 ms. The bar chart above shows every period we have measured.
How do I connect Cron Explainer?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Cron Explainer need an API key?
No. Cron Explainer completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Cron Explainer?
It answers our handshake in 115 ms on average, which is faster than 91% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Cron Explainer open source?
The code is open source: it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at cron-explainer.cron-explainer-prod.workers.dev, which runs on its operator's own terms.