Oh Dear vs Prometheus
A detailed comparison to help you choose between Oh Dear and Prometheus.
Quick Verdict
4.2/5
Oh Dear
0 reviews
4.2/5
Prometheus
0 reviews
Both Oh Dear and Prometheus are equally rated at 4.2/5. Oh Dear provides uptime monitoring, SSL certificate monitoring, broken link checking, DNS monitoring, and cron job monitoring from a single dashboard. Simple, no-frills approach. Prometheus is the leading open source metrics monitoring system. Pull-based metrics collection, PromQL query language, and Alertmanager. Kubernetes-native. Self-hosted with integrations for 200+ services.
Oh Dear Website monitoring with SSL and broken link checks | Prometheus Open source metrics and alerting system | |
|---|---|---|
| Overview | ||
| Rating | 4.2 (0 reviews) | 4.2 (0 reviews) |
| Pricing model | paid | free |
| Starting price | From $15/mo | Free✓ |
| Best for | Agencies and small teams who want one subscription covering uptime, SSL, broken links, DNS, cron and status pages for a roster of client sites | DevOps and platform teams that want the Kubernetes-native open-source metrics standard they fully control, and accept running the storage and HA story themselves. |
| Features | ||
| IPv6 | ||
| DDoS protection | ||
| Automated backups | ||
| Snapshots | ||
| Managed option | ||
| Bare metal | ||
| GPU available | ||
| S3-compatible | ||
| Hourly billing | ||
| Free tier | ✓ | |
| Data-center locations | ||
| Regions | Hosted in Belgium (EU) on ISO 27001 infrastructure; ~16 check locations worldwide | — |
| Tags | ||
| Tags | api access | free tieropen sourceself hostable |
| Visit Oh Dear → | Visit Prometheus → | |
Oh Dear
Pros
- + Every feature on every plan — no tiering of SSO, status pages, users, or API access
- + Two-location verification before firing alerts, which genuinely reduces false alarms
- + One site slot replaces uptime, SSL, broken-link, DNS, cron and Lighthouse tools at a predictable per-site price
- + EU-hosted (Belgium, ISO 27001 infrastructure) with full API and strong agency/reseller workflow
Cons
- - No free plan and no single-site tier below €15/month
- - Website/server monitoring only — no APM, metrics, logs, or host-level observability
- - Small vendor (2–10 people) with no published SLA for the monitoring service itself
- - Per-site cost is above bare uptime checkers; 200 sites costs €399/month
Prometheus
Pros
- + Free and open source under Apache 2.0 with independent CNCF governance — no per-node or per-metric licensing
- + The industry-standard metrics stack: PromQL, multidimensional labels, and exporters for most software you already run
- + Kubernetes and Consul service discovery keep target configuration sane at container scale
- + Simple core: single autonomous nodes with local TSDB and a documented operational model
- + CNCF graduated since 2018 with a decade of production history and a very active contributor community
- + Honest documentation — storage constraints and the security model are stated plainly, including what the product deliberately does not do
Cons
- - No built-in long-term storage or global HA — Thanos, Cortex, or Grafana Mimir are separate operational projects
- - High-cardinality labels can blow up RAM and disk with no guardrails in the product
- - No built-in authentication or encryption; endpoints must be kept behind a perimeter by design
- - Multi-tenancy and access control are absent from the core
- - Community support only for the open-source download — SLAs come with paid managed offerings
- - PromQL and histogram handling have a genuine learning curve for teams new to the model
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