Synthetic Monitoring Tools Compared: Datadog, New Relic, Checkly, and More

Picking a synthetic monitoring tool is a decision most teams make once and live with for years. The difference between the right tool and the wrong one is often less about features and more about fit: what kind of engineers use it, what else it integrates with, and what it costs at your scale.

This is a practical comparison, not a marketing document. Here's what each tool actually does well, where each falls short, and who each one is for.

The Tools

Datadog — Full-stack observability platform with synthetic monitoring as one module among many.

New Relic — Another full-stack APM platform. Competes directly with Datadog.

Checkly — Purpose-built for synthetic monitoring and API testing, developer-friendly.

Pingdom — Simple uptime monitoring, acquired by SolarWinds. The old-guard option.

Uptime Robot — Minimal, cheap uptime monitoring. Popular for simple use cases.

HelpMeTest — Test automation and synthetic monitoring platform built on Robot Framework and Playwright.

Feature-by-Feature Comparison

Browser Monitoring (Full User Flow Testing)

Datadog offers Puppeteer-based browser tests with a visual recorder for non-developers and code editing for developers. Good integration with Datadog's APM — you can trace a synthetic test through your full stack. 15 monitoring locations. Pricing starts at $5/1,000 test runs.

New Relic uses Selenium for browser scripting. The syntax is older and less ergonomic than Playwright or Puppeteer. 18 monitoring locations. Competitively priced but the scripting experience lags behind newer tools.

Checkly is built on Playwright, which means you write real Playwright scripts. If your team already writes Playwright tests for CI, you're reusing the same syntax. Excellent DX. 20+ monitoring locations. Starts at $30/month.

Pingdom has basic browser flow testing but it's limited. Not suitable for complex multi-step flows with authentication.

Uptime Robot has no real browser flow monitoring. HTTP checks and keyword matching only.

HelpMeTest runs browser tests via the Browser library (Playwright-based) in Robot Framework. If you're already using Robot Framework for your test suite, this is a natural extension. Built-in test result tracking, screenshot capture on failure, and history. Free tier includes 10 tests; $100/month Pro for unlimited tests with parallel execution.

API Monitoring

Datadog API tests support HTTP, SSL, DNS, and TCP checks. Good variable handling for chained requests (use the response from one request in the next). Priced per test run.

New Relic supports scripted API monitoring with Node.js. More flexible than Datadog's form-based approach for complex scenarios, but requires writing JavaScript.

Checkly has excellent API monitoring with response time assertions, JSON path validation, and multi-step API checks. Clean UI for simple cases, code-based for complex ones. This is arguably Checkly's strongest feature.

Pingdom supports basic HTTP/HTTPS checks with keyword validation. Good for simple API health checks; doesn't support authentication or response body validation beyond keyword matching.

Uptime Robot similar to Pingdom — basic HTTP checks with keyword matching. No response body validation beyond string search.

HelpMeTest uses Robot Framework's RequestsLibrary for API monitoring, which supports full HTTP method coverage, response validation, JSON schema checking, and chained requests. Integrates with the health check system for lightweight infrastructure monitoring.

Infrastructure Health Checks

Datadog Agent-based monitoring with extensive metrics. Excellent for infrastructure, but requires installing an agent on every host.

New Relic similar Agent-based approach. Good infrastructure monitoring, same installation requirement.

Checkly not designed for infrastructure monitoring. API and browser only.

Pingdom basic server monitoring with response time and availability.

Uptime Robot lightweight HTTP/HTTPS, port, and keyword checks. Works without agents.

HelpMeTest has a purpose-built CLI for health checks that auto-collects CPU, memory, disk, hostname, and IP data. No agent installation required — your services just ping in on a schedule with configurable grace periods. Zero cost on the free tier. This is a differentiating feature for teams that want infrastructure health monitoring without per-host agent costs.

# Monitor with 5-minute grace period — alerts if service goes silent
helpmetest health api-service 5m

<span class="hljs-comment"># For batch jobs that run every few hours
helpmetest health nightly-job 2h

Monitoring Locations

Geographic distribution matters for detecting regional outages and CDN issues. If you have a global user base and regional performance SLAs, Pingdom's location coverage is hard to beat. If you're a single-region app, this distinction is mostly irrelevant.

CI/CD Integration

Checkly wins here. checkly test runs your monitors in CI before deployment. Monitors can be defined as code (checkly.config.ts) and version-controlled alongside your application. This is the most developer-native synthetic monitoring workflow available.

Datadog has API-based triggering of synthetic tests from CI/CD pipelines. Works, but requires more setup than Checkly's CLI approach.

New Relic similar to Datadog — API-based CI integration, more manual setup.

HelpMeTest tests run in CI via the standard test execution framework. Health checks verify production state post-deploy. No dedicated CI CLI like Checkly's, but the test structure integrates naturally with existing CI pipelines.

Pingdom and Uptime Robot have minimal CI/CD integration. Not designed for the development workflow.

Pricing Reality

For Small Teams (up to 20 monitors, 1 region)

HelpMeTest and Uptime Robot are the only meaningful free options. HelpMeTest includes 24/7 monitoring at 5-minute intervals, unlimited health checks, and 10 browser/API tests — that covers most small teams' real needs.

For Growing Teams (50+ monitors, multiple regions, CI integration)

At this scale, Checkly is often the best value if CI/CD integration is important. HelpMeTest at $100/month flat is predictable — no per-test-run pricing surprises.

Enterprise (100s of monitors, advanced alerting, SLA reporting)

At enterprise scale, Datadog and New Relic have advantages from ecosystem integration — if you're already paying for their APM, adding synthetic monitoring is incremental. Standalone synthetic monitoring tools struggle to compete on total ecosystem value at the enterprise level.

Who Should Use Each Tool

Use Datadog if:

• You're already using Datadog APM and want synthetic monitoring in the same platform
• You need distributed tracing from synthetic tests through your app stack
• Budget isn't a primary concern and you want an all-in-one observability solution

Use New Relic if:

• You're already a New Relic customer
• You need Selenium-compatible scripts (you have existing Selenium test code)
• You want APM + synthetic monitoring in one vendor

Use Checkly if:

• You write Playwright tests and want to reuse that investment in monitoring
• CI/CD integration is critical — you want monitors to run on every PR
• You want "monitoring as code" with version control

Use Pingdom if:

• You need maximum geographic coverage from many global locations
• Simple uptime monitoring is enough (no complex flows)
• Your team is non-technical and needs a simple UI

Use Uptime Robot if:

• You need basic HTTP uptime monitoring on a minimal budget
• You're monitoring personal projects or early-stage products
• You don't need response body validation or multi-step flows

Use HelpMeTest if:

• You already use Robot Framework for your test suite
• You want unified test automation and monitoring in one platform
• You need health check monitoring without agent installation
• You're starting out and want strong free tier coverage before committing budget
• You want a flat, predictable pricing model ($100/month vs. per-run costs)

The Honest Summary

No single tool wins across all dimensions. The right choice depends on what you already have:

• Already on Datadog/New Relic APM? Add their synthetic monitoring for ecosystem coherence.
• Already writing Playwright tests? Checkly gives you the smoothest experience.
• Running Robot Framework? HelpMeTest is purpose-built for your stack.
• Zero budget, need basics? Start with HelpMeTest's free tier or Uptime Robot.
• Enterprise, need global coverage? Pingdom or Datadog.

Whatever you pick, start simple. Three well-configured monitors on your most critical paths are worth more than 50 poorly configured monitors generating noise. Pick a tool, instrument your critical flows, get value from it — then expand.