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testcritic

New Relic Synthetic Monitoring vs Datadog Synthetic Monitoring

Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.

Entry price

Free tier available

Free tier

From $5 per 10k API test runs (browser tests are $12 per 1k)

Paid

What drives the bill

The metric that actually scales your invoice.

The free tier is genuinely usable. Costs come from full-platform user seats rather than check volume.

Note the different units: Datadog bills API tests per ten thousand runs and browser tests per thousand, so browser tests are roughly 24x the unit cost. A test run is one execution from one location, so multi-location checks multiply. Costs land inside a wider Datadog contract that is rarely small.

Free tier

100 GB of data ingest and one full-platform user free every month, permanently.

14-day trial.

Open source

Self-hostable

No-code authoring

Languages

JavaScript
JavaScriptCodeless

Platforms

WebAPI
WebAPIiOSAndroid

Fits teams

StartupScale-up / mid-marketEnterprise
Scale-up / mid-marketEnterprise

Adoption

Widely used

New Relic · since 2015

Category standard

Datadog · since 2019

Strengths

  • The most generous permanent free tier of any major observability platform.
  • Synthetics, APM, logs and RUM under one bill and one query language.
  • Scripted browser monitors use standard Selenium-style JavaScript.
  • Correlation with APM traces and logs makes root-cause analysis dramatically faster.
  • Private locations let you monitor internal services behind the firewall.
  • Recorded browser tests are authorable by people who do not write code.

Limitations

  • Per-user pricing for full-platform access surprises teams that want wide visibility.
  • The interface is dense and takes time to navigate confidently.
  • Synthetics is less differentiated than Datadog's correlation story.
  • Only worth it if you are already a Datadog customer; standalone it is expensive.
  • Datadog billing complexity is a well-known source of budget surprises.
  • The recorder produces tests that are harder to version and review than code.

Best for

Teams wanting an observability platform with monitoring included and a real free tier.

Existing Datadog customers who want monitoring in the same pane as their observability data.

All of these integrate with: PagerDuty, Slack, Terraform.

Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.