> ## Documentation Index
> Fetch the complete documentation index at: https://pulse-41cf5b0d.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Free Diagnostic Tools in PulseGuard

> PulseGuard includes 10 free diagnostic tools: SSL checker, DNS sentinel, port checker, global latency probe, payload tester, and more.

PulseGuard ships with a suite of free diagnostic tools you can access directly from the **Tools** menu in the dashboard. Most tools require no account — open the URL, enter a target, and get results in seconds. All tools run on Cloudflare's global edge network, so measurements reflect real-world conditions from points of presence distributed across the globe rather than a single data-centre origin.

<Note>
  These tools run on Cloudflare's edge network, giving you accurate latency readings and DNS resolution results from multiple geographic vantage points — not just from a single server location.
</Note>

## Available Tools

<CardGroup cols={2}>
  <Card title="SSL Checker" icon="lock" href="https://app.pulseguard.io/tools/ssl-checker">
    Inspect any domain's SSL/TLS certificate: validity period, issuer chain, expiry date, and negotiated protocol version. Catch near-expiry certificates before they cause downtime.
  </Card>

  <Card title="DNS Sentinel" icon="globe" href="https://app.pulseguard.io/tools/dns-sentinel">
    Query DNS records — A, AAAA, MX, CNAME, TXT, and NS — across multiple resolvers simultaneously. Quickly identify propagation lag or resolver inconsistencies.
  </Card>

  <Card title="Port Checker" icon="network-wired" href="https://app.pulseguard.io/tools/port-checker">
    Test TCP connectivity to any `host:port` combination from the edge network. Confirm whether a firewall rule or security group is working without needing a bastion host.
  </Card>

  <Card title="HTTP Security Headers" icon="shield-halved" href="https://app.pulseguard.io/tools/http-headers">
    Analyse HTTP response security headers — HSTS, Content Security Policy, X-Frame-Options, and more — and receive a letter-grade score with remediation advice.
  </Card>

  <Card title="Global Latency Probe" icon="earth-americas" href="https://app.pulseguard.io/tools/global-latency">
    Measure round-trip latency to any URL from multiple geographic regions in one click. Surface which regions are experiencing elevated response times or failures.
  </Card>

  <Card title="Payload Regex Tester" icon="code" href="https://app.pulseguard.io/tools/payload-regex">
    Test regular expressions and JSONPath expressions against a sample HTTP response body. Validate assertion patterns before applying them to a monitor.
  </Card>

  <Card title="IP Subnet Calculator" icon="calculator" href="https://app.pulseguard.io/tools/ip-subnet">
    Calculate network ranges, broadcast addresses, usable host counts, and subnet masks from CIDR notation. Supports both IPv4 and IPv6 prefixes.
  </Card>

  <Card title="Visual Diff" icon="images" href="https://app.pulseguard.io/tools/visual-diff">
    Compare two URLs visually side by side to detect layout regressions or unexpected changes after a deployment.
  </Card>

  <Card title="Cron Sentinel" icon="clock" href="https://app.pulseguard.io/tools/cron-sentinel">
    Build, validate, and translate cron expressions into plain English. Paste an existing expression to understand when it fires, or generate one from a human-readable schedule.
  </Card>

  <Card title="Roast My Stack" icon="fire" href="https://app.pulseguard.io/tools/roast-my-stack">
    Submit your tech stack and receive an AI-powered analysis with actionable security hardening and performance improvement recommendations.
  </Card>
</CardGroup>

<Tip>
  The **Payload Regex Tester** is especially useful when setting up response assertions on HTTP monitors. Paste a real response body from your target service, write your regex or JSONPath expression, and confirm it matches before saving the monitor.
</Tip>

## Accessing the Tools

You can reach any tool directly from the **Tools** menu in the top navigation bar of the dashboard. All tools are accessible without logging in, so you can bookmark them or share links with teammates.