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testcritic

Sentry 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

From $26 per month (Team plan, indicative)

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.

Event-volume pricing. A noisy application can consume the quota quickly, so filtering matters.

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

Free developer plan with a monthly error and replay allowance.

14-day trial.

Open source

BSL / FSL

Self-hostable

No-code authoring

Languages

JavaScriptTypeScriptPythonJavaC#GoRubyPHPSwiftKotlinDart
JavaScriptCodeless

Platforms

WebAPIiOSAndroidDesktop
WebAPIiOSAndroid

Fits teams

Solo / side projectStartupScale-up / mid-marketEnterprise
Scale-up / mid-marketEnterprise

Adoption

Category standard

Functional Software (Sentry) · since 2012

Category standard

Datadog · since 2019

Strengths

  • Release and commit attribution tells you which deploy introduced the error, and often who to ask.
  • Excellent SDK coverage across essentially every language and framework.
  • Self-hosting is genuinely supported for teams that need it.
  • 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

  • Event-based pricing punishes noisy applications until you invest in filtering.
  • The product has broadened a lot; some newer modules are shallower than the error core.
  • Self-hosting is resource-hungry.
  • 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

Essentially every engineering team — error tracking is the highest-value monitoring you can add first.

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

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

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