Owl Keeper review
A specialized agency monitor covering websites, infrastructure, domains, certificates and mail security.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Owl Keeper is a web-based monitoring service for agencies and teams responsible for client websites. It combines HTTP uptime checks with expected status codes and body keywords, TCP port checks, mail-server checks with STARTTLS, and monitoring for certificates, domain registration, DNS, and email authentication. It also covers SPF, DKIM, DMARC, MTA-STS and BIMI, alongside uptime history, response-time charts, scheduled jobs, tags, status pages and webhook alerts. Its focus suits agencies that need to watch both website availability and the surrounding domain and mail-security setup.
The Free plan covers 10 sites, 25 monitors, checks every 5 minutes, stores 30 days of history and supports one person. It also includes unlimited status pages. Agency Starter costs $49 per site per month or $490 per site per year and raises coverage to 50 sites, 200 monitors, checks every minute, one year of history and five people. Agency Growth costs $99 per site per month or $990 per site per year, covering 200 sites with unlimited monitors, two years of history, unlimited people and priority support. The paid tiers are suited to larger client portfolios, while the free tier provides a narrower starting point.
For agency operations, Owl Keeper brings website, certificate, domain, DNS and mail-authentication checks into one specialized service. Alerts can be sent through email, webhooks, Slack and Discord, and status pages can be used across plans. The service is web-only, and its per-site pricing may be less suitable for teams that monitor many targets without managing them as separate sites. Agencies needing this combined web and mail-security scope should consider Owl Keeper; teams seeking a broader, less specialized monitoring approach may prefer an alternative.
Owl Keeper pros and cons
- Where it wins
- Monitors certificates, domains, DNS, SPF, DKIM, DMARC, MTA-STS and BIMI
- Supports HTTP, TCP, mail-server, scheduled-job and response-time monitoring
- Includes status pages, webhooks, Slack and Discord alerts
- Where it doesn't
- Paid plans are priced per site per month or per site per year
- The Free plan checks every 5 minutes rather than every minute
- Free supports one person and 25 monitors
Owl Keeper fact sheet, pricing and score →
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