"Application monitoring tools" turns up a different shortlist depending on who's searching. A Java shop means something different by it than a PHP shop, and a team that just wants to self-host something means something different again. The one thing every answer shares is that the sticker price on the homepage rarely matches what shows up on the invoice.
This post lines up four tools that cover the range: two consumption-priced platforms (New Relic, Dynatrace), one enterprise incumbent that no longer publishes a price at all (AppDynamics, now sold through Splunk), and one open-source option you can run yourself for nothing (SigNoz).
Four Different Pricing Philosophies#
Per-host or per-GiB, billed on commitment. Dynatrace prices by host memory and by the GiB of logs, traces, and metrics you ingest, drawn down against an annual spend commitment. You know the rate card up front; you don't know the bill until usage settles.
Per-GB of data plus per-seat. New Relic's free tier covers 100 GB of ingest a month, which is enough for a lot of small services. Past that it's $0.40/GB, and then a separate charge per full-platform user on top, so the same ingest volume costs differently depending on team size.
Quote-only. AppDynamics pricing used to be public. Cisco's acquisition of Splunk folded AppDynamics into Splunk's observability line, and the pricing page now asks for a name and business email before it will show anything (splunk.com/en_us/products/pricing, read 2026-10-22). That's not unusual for enterprise APM, but it means you can't shortlist on price alone the way you can with the other three here.
Usage-based, open core. SigNoz publishes a rate card and lets you skip it entirely by self-hosting the community edition for free. The managed cloud tier starts at $49/month including that much usage, then $0.30/GB for traces and logs and $0.10 per million metric samples beyond it (signoz.io/pricing, read 2026-10-22).
Side by Side#
| Tool | Pricing model | Free / entry option | Price read 2026-10-22 |
|---|---|---|---|
| New Relic | Per-GB ingest + per-seat | 100 GB/month free, 1 free full-platform user | $0.40/GB beyond 100 GB. Full-platform user $10 first / $99 additional (Standard, max 5), $349/user/year or $418.80/user/month (Pro) |
| Dynatrace | Annual commit, drawn down per host/GiB | 15-day free trial, no perpetual free tier | Full-Stack Monitoring (APM) $58/mo per 8 GiB host. Infrastructure-only $29/mo per host. Traces $0.20/GiB ingest |
| AppDynamics (via Splunk) | Quote only | None published | No public figures; contact-sales form only |
| SigNoz | Usage-based, self-host free | Community edition free forever (self-hosted) | Cloud Teams from $49/mo (incl. $49 usage), then $0.30/GB traces/logs, $0.10/mn metric samples. Enterprise from $4,000/mo |
New Relic#
New Relic's free tier is genuinely usable, not a trial: 100 GB of data ingest a month, unlimited basic (view-only) users, and one free full-platform user with access to the whole platform's 50-plus capabilities (newrelic.com/pricing, read 2026-10-22).
The catch shows up once a second engineer needs full access. Standard caps full-platform users at five, priced $10 for the first and $99 for each additional. Pro removes that cap but moves full-platform users to $349/user on an annual commitment, or $418.80/user paying monthly. For a five-person team that wants everyone in the platform daily, the per-seat cost adds up faster than the per-GB ingest does.
Dynatrace#
Dynatrace sells one thing: an annual platform commitment, drawn down against a published rate card, with every capability unlocked from day one (dynatrace.com/pricing, read 2026-10-22). Full-Stack Monitoring, the tier that includes APM, root-cause analysis, and code-level profiling, runs $58/month per 8 GiB of host memory. Infrastructure-only monitoring, without APM, is $29/month per host.
The rate card is granular to a fault: traces, logs, metrics, Kubernetes pods, synthetic checks, and even AI-assisted queries each draw down the same commit at their own per-unit rate. That's transparent in the sense that nothing is hidden, and hard to budget in the sense that a team has to add up a dozen line items to know what a month will actually cost before they sign the annual commitment.
AppDynamics#
AppDynamics has been agent-based APM since 2008, well before the current consumption-pricing wave, and until recently it published its own pricing page. That page now redirects to Splunk's pricing hub, which asks for contact details before showing anything (splunk.com/en_us/products/pricing#observability, read 2026-10-22). AppDynamics vs Splunk covers how the two products fit together under one parent company now.
Practically, this means AppDynamics is the one tool on this list you can't shortlist on a number. If list pricing matters to your evaluation timeline, expect a sales call before you get one.
SigNoz#
SigNoz is the outlier here: an open-source APM and observability stack built on OpenTelemetry, with a community edition you can self-host for free indefinitely, no license fee (signoz.io/pricing, read 2026-10-22). For teams with the operational appetite to run their own ClickHouse-backed stack, that's a real zero on the APM line item.
The managed SigNoz Cloud tier starts at $49/month, which includes $49 worth of usage, then bills $0.30/GB for traces and logs ingested and $0.10 per million metric samples past that. Enterprise plans for dedicated or bring-your-own-cloud deployments start at $4,000/month. The trade-off against New Relic or Dynatrace is smaller out-of-the-box integration breadth in exchange for no per-seat charge and a genuinely free self-hosted path.
Picking Between Them#
Small team, want a usable free tier without self-hosting anything. New Relic. 100 GB of ingest covers most early-stage workloads, and the one free full-platform user is enough for a single engineer to live in the dashboard daily.
Large environment, want one predictable annual number instead of surprise per-metric bills. Dynatrace's commitment model trades simplicity in the rate card for simplicity in the invoice: you know your spend cap going in, even if the per-capability math underneath it is dense.
Already running Splunk, or need a single enterprise vendor relationship. AppDynamics is worth the sales call specifically because it now sits inside the same contract as Splunk's log platform.
Team with DevOps capacity and a preference for owning the stack. SigNoz's self-hosted community edition removes the pricing question entirely, at the cost of running ClickHouse and the collector yourself.
What APM Doesn't Cover#
Every tool above instruments code that's already running inside your infrastructure. None of them tells you whether a user with no account, no agent, and no prior relationship to your app can actually reach it from outside. A DNS misconfiguration, an expired certificate, or a load balancer serving a blank page all look fine from inside a healthy service and broken from everywhere else.
That's the gap ObserveOne fills: scheduled uptime and API checks run from outside your infrastructure, in multiple regions, independent of whichever APM vendor's agent is also watching the same service from the inside.
Conclusion#
New Relic and Dynatrace both charge by consumption but structure that consumption differently enough that the same workload prices out differently on each. AppDynamics no longer competes on a published number at all. SigNoz is the only one here where "free" means a real, permanently free self-hosted option rather than a trial window.
Pick based on who's going to operate the tool, not just what the rate card says. ObserveOne covers the outside-in check that none of these four tools are built to do.