New Relic Synthetic Monitoring vs Sentry

Free tier available

From $26 per month (Team plan, indicative)

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

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

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

Free developer plan with a monthly error and replay allowance.

Widely used

New Relic · since 2015

Category standard

Functional Software (Sentry) · since 2012

• 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.

• 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.

• 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.

• 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.

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

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