Full Stack Audit vs Oh Dear
Oh Dear tells you when your site goes down. Full Stack Audit tells you what is wrong with it while it is up. Here is how they differ, and when each one is the right pick.
Oh Dear in short
Oh Dear is a mature monitoring service from Belgium. It checks uptime every minute from several locations, confirms every outage from a second one, and also watches SSL certificates, broken links and mixed content, DNS records, domain expiry, cron jobs and application health. Branded status pages and monthly client reports make it a favourite of agencies.
Full Stack Audit does not watch uptime, cron jobs or servers. It audits how your site is built: security headers and TLS, SEO, structured data, accessibility, email authentication, DNS hygiene, privacy and Lighthouse, 127 checks in all, each with an explanation and a fix. The two overlap on certificates, broken links, DNS and Lighthouse, and many teams would run both.
Feature by feature
| Feature | Full Stack Audit | Oh Dear |
|---|---|---|
| Security headers and TLS configuration | YesHSTS, CSP and other headers, TLS versions and grade, certificate validity | PartlySSL certificate health, no header checks |
| Lighthouse and Core Web Vitals | YesLighthouse in real Chrome, Core Web Vitals from Chrome UX Report data | YesDaily Lighthouse runs |
| SEO: titles, canonicals, robots.txt, sitemaps, structured data | Yes | PartlySitemap monitoring and the Lighthouse SEO score |
| Email authentication: SPF, DKIM, DMARC | YesPlus BIMI and MTA-STS | PartlyDNS record changes and DNS blocklists |
| DNS and domain expiry | YesDNSSEC, CAA, nameservers and domain expiry | Yes |
| Broken links and redirects | Yes | Yes |
| Uptime checks every minute | No | YesFrom several locations |
| Cron jobs, servers and status pages | No | Yes |
| Scheduled re-checks | YesWeekly, every two weeks or monthly on the Free plan | YesEvery minute; links and Lighthouse daily |
| Alerts | YesEmail, when a passing check starts failing | YesSlack, Teams, PagerDuty, email and webhooks |
| API and AI agents | YesMCP server for AI agents such as Claude or Cursor | YesFull API |
| Price | YesFree plan for one site | PartlyFrom €15/month for 2 sites, 10-day free trial |
Other tools' features and prices as listed on their own websites on October 30, 2026. Prices exclude VAT.
Pick Oh Dear if
- You need to know within a minute when a site goes down.
- You monitor cron jobs, servers or open ports as well as websites.
- You want public status pages and alerts in Slack, Teams or PagerDuty.
Pick Full Stack Audit if
- You want to know what to fix, not just that something broke: security headers, SEO, accessibility, structured data.
- You care about email deliverability: SPF, DKIM, DMARC, BIMI and MTA-STS are graded.
- You want to start free, and let an AI agent read the results through the MCP server.
Audit your site free and compare the results yourself
Run all 126 checks on your own site, then put the report next to the tools you use today.
More comparisons
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Full Stack Audit, Oh Dear, Little Warden and the free one-off testers, side by side.
Little Warden alternative
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The free testers you run by hand, on a schedule and with alerts.