What Claude (Anthropic) with web search answered for application performance monitoring (agencies) on 2026-09-29

Claude (Anthropic) with web search claude-opus-5 asked 2026-09-29

Coverage: Claude (Anthropic) with web search. Other engines not included.

The question asked, verbatim: best application performance monitoring for agencies

Brands named, in the order the engine gave

1. Sentry mentioned
   For most agencies: Sentry first
2. SigNoz compared
   (index.dev comparison (https://www.index.dev/skill-vs-skill/sentry-vs-datadog-vs-new-relic), SigNoz (https://signoz.io/comparisons/datadog-vs-sentry/))
3. New Relic mentioned
   New Relic - Best when clients need full-stack (app + infra + logs + browser) and you want one tool to cover all of it.
4. Datadog mentioned
   Datadog - Don't lead with this, but you'll end up in it anyway because enterprise clients already run it and you inherit their account.
5. Better Stack compared
   (Better Stack comparison (https://betterstack.com/community/comparisons/datadog-vs-newrelic/))
6. Grafana Cloud mentioned
   Better Stack or Grafana Cloud - The cheap layer underneath the above.
7. OpenTelemetry mentioned
   Grafana Cloud if you want OpenTelemetry-native and no vendor lock-in;
8. Dotcom-Monitor mentioned
   Dotcom-Monitor - The one tool in this list explicitly built for the agency/MSP model: white-label reporting and multi-tenant client management.
9. Monitor mentioned
   Dotcom-Monitor - The one tool in this list explicitly built for the agency/MSP model: white-label reporting and multi-tenant client management.
10. Dynatrace mentioned
    Dynatrace - Only for agencies doing enterprise transformation work.

Sources the engine cited

The answer, as recorded

## For most agencies: Sentry first **1. Sentry** - The default pick for a dev/web agency. Error tracking + tracing + session replay, organized as separate *projects* under one org, so each client's data stays cleanly separated and you can see at a glance which client site is broken. Pricing is event-based (~$26/mo team tier and up), not per-host, which matters enormously when you're running 30 small client apps instead of one big one - host-based tools would bankrupt you on that shape of work. Weakness: it's app-layer only, not infrastructure. ([index.dev comparison](https://www.index.dev/skill-vs-skill/sentry-vs-datadog-vs-new-relic), [SigNoz](https://signoz.io/comparisons/datadog-vs-sentry/)) **2. New Relic** - Best when clients need full-stack (app + infra + logs + browser) and you want one tool to cover all of it. The 100 GB/month perpetual free tier plus $0.30-0.50/GB after is genuinely useful for an agency: you can onboard small clients at effectively zero cost and only pay as a client's traffic justifies it. User-based seat pricing is the thing to watch if your whole team needs access. ([New Relic](https://newrelic.com/blog/apm/application-performance-monitoring-tools), [SigNoz](https://signoz.io/comparisons/newrelic-vs-sentry/)) **3. Datadog** - Don't lead with this, but you'll end up in it anyway because enterprise clients already run it and you inherit their account. Best-in-class breadth (APM, RUM, logs, infra, synthetics in one place). At ~$15/host infra + ~$31/host APM plus separate log/RUM/metric billing, it's the wrong economics to standardize on across a portfolio of small clients - use it on the clients who pay for it. ([Better Stack comparison](https://betterstack.com/community/comparisons/datadog-vs-newrelic/)) **4. Better Stack or Grafana Cloud** - The cheap layer underneath the above. Uptime/heartbeat checks, status pages, and log retention per client at a price point where you can justify putting *every* client on it, including the $500/mo retainer ones. Grafana Cloud if you want OpenTelemetry-native and no vendor lock-in; Better Stack if you want status pages you can brand and hand to the client. **5. Dotcom-Monitor** - The one tool in this list explicitly built for the agency/MSP model: white-label reporting and multi-tenant client management. Worth a look specifically if your clients expect a branded monthly performance report with your logo on it rather than a login to someone else's dashboard. Thinner on deep code-level tracing than Sentry or New Relic. ([dotcom-monitor](https://www.dotcom-monitor.com/blog/application-performance-monitoring-tools/)) **6. Dynatrace** - Only for agencies doing enterprise transformation work. OneAgent auto-instrumentation and the Davis AI root-cause engine are the best in the category at reducing time-to-diagnosis, but host-unit pricing (~$69/mo per 8 GiB host) and the implementation weight make it a poor fit for small-client portfolios. ([Coralogix](https://coralogix.com/guides/application-performance-monitoring-tools/), [ManageEngine](https://www.manageengine.com/it-operations-management/application-observability/apm-tools-comparison.html)) **The practical agency stack:** Sentry for every client app + Better Stack for uptime across the whole portfolio, then New Relic or Datadog layered on for the two or three clients whose contracts fund real observability. The mistake to avoid is standardizing on a host-priced tool across many small clients. One structural note: decide early whether monitoring lives in *your* account or the *client's*. Client-owned accounts avoid the awkward conversation at offboarding and keep you out of being a data processor for their user data; your-account is easier to operate and lets you resell. Most agencies do client-owned for anything with PII, agency-owned for uptime checks. Sources: - https://www.index.dev/skill-vs-skill/sentry-vs-datadog-vs-new-relic - https://signoz.io/comparisons/datadog-vs-sentry/ - https://signoz.io/comparisons/newrelic-vs-sentry/ - https://newrelic.com/blog/apm/application-performance-monitoring-tools - https://betterstack.com/community/comparisons/datadog-vs-newrelic/ - https://www.dotcom-monitor.com/blog/application-performance-monitoring-tools/ - https://coralogix.com/guides/application-performance-monitoring-tools/ - https://www.manageengine.com/it-operations-management/application-observability/apm-tools-comparison.html

Near this answer

The same question, recorded on other dates: 2026-09-27, 2026-09-25, 2026-09-23, 2026-09-21, 2026-09-17, 2026-09-15, 2026-09-13, 2026-09-11, 2026-09-08, 2026-09-06.

application performance monitoring, asked for other audiences: startups (asked 2026-09-29).

Other categories with a recorded answer: api management platforms, ci cd platforms, code repository hosting, content management systems.

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