best apm tools for elixir and phoenix applications

Elixir and Phoenix applications run on the BEAM virtual machine, which means they have performance characteristics that are genuinely different from Ruby or Python apps1. The BEAM handles concurrency through lightweight processes, supervision trees restart failed processes automatically, and LiveView maintains persistent WebSocket connections — none of which generic APM tools are built to understand1.

The right monitoring tool for an Elixir app needs to understand Phoenix, Ecto, Oban, and BEAM VM metrics — not just HTTP request/response cycles. Here's how the top options stack up.

What matters for Elixir APM

Before diving into picks, here are the differentiators that actually matter for Elixir teams:

• BEAM VM visibility — Can the tool surface process counts, scheduler utilization, atom usage, and memory breakdowns? Most generic APMs can't.1
• Framework instrumentation — Does it instrument Phoenix, Ecto, Oban, and Absinthe out of the box, or do you need to wire up OpenTelemetry libraries manually?1
• N+1 detection — Ecto makes N+1 queries easy to miss. Some tools catch them automatically; others require manual trace inspection.3
• LiveView support — LiveView's persistent connections don't fit the traditional request/response model. Tools that understand LiveView can trace across the full connection lifecycle.3
• Pricing model — Per-request, per-host, or self-hosted? This matters a lot for BEAM apps that handle many lightweight processes per request.

The picks

1. AppSignal — Best for Elixir-first teams

AppSignal has genuine roots in the Elixir community and provides BEAM-aware instrumentation that most other tools don't surface1. The Elixir integration understands Phoenix, Ecto, Oban, and Absinthe out of the box, and the BEAM-specific dashboard shows VM metrics like process counts, atom usage, and scheduler utilization1.

All features — error tracking, performance monitoring, event metrics, host metrics, and alerts — are included in one plan2. There's a free tier for apps under 50K requests per month, and a 30-day free trial with no credit card required2.

If your team is primarily Elixir/Phoenix, AppSignal is the clear choice. It's the only tool on this list that was built with BEAM semantics as a first-class concern rather than an afterthought.

2. Datadog APM — Best for enterprise polyglot stacks

Datadog provides distributed tracing for Elixir via dd-trace-elixir, covering Phoenix and Ecto6. Where Datadog shines is breadth: if your infrastructure already spans multiple languages and services, Datadog gives you a unified view across all of them.

The trade-off is that Datadog's BEAM VM visibility is shallower than AppSignal's, and pricing is per-host with feature add-ons that can add up quickly. For teams already invested in the Datadog ecosystem, adding Elixir tracing is straightforward. For Elixir-only teams, it's overkill.

3. New Relic — Best for cross-stack correlation

New Relic offers a full observability platform covering APM, infrastructure, logs, and browser monitoring6. The Elixir agent handles Phoenix and Ecto basics, but it lacks the deep BEAM VM dashboard that AppSignal provides1.

New Relic's standout feature is its 100GB free tier, which is generous for smaller teams. It's a good fit for polyglot organizations that want to correlate Elixir app performance with infrastructure and frontend metrics in one place.

4. SigNoz — Best open-source OTel platform

SigNoz is an open-source, OpenTelemetry-native observability platform that's self-hostable4. It works with Elixir's OpenTelemetry libraries — opentelemetry_phoenix, opentelemetry_ecto, and the rest of the OTel ecosystem3.

Setting up OTel in Elixir involves adding dependencies like opentelemetry_phoenix, opentelemetry_cowboy, and opentelemetry_ecto, then configuring them in application.ex with calls like OpentelemetryPhoenix.setup() and OpentelemetryEcto.setup([:app, :repo])4. SigNoz accepts this data and provides dashboards and alerting on top of it.

If your team wants a vendor-neutral OTel pipeline and the ability to self-host, SigNoz is the strongest open-source alternative to Datadog.

5. Grafana Tempo — Best for self-hosted tracing

Grafana Tempo is a free, open-source tracing backend that pairs naturally with Elixir's OpenTelemetry libraries3. The Fly.io guide walks through setting up opentelemetry_phoenix, opentelemetry_ecto, opentelemetry_liveview, and opentelemetry_cowboy in a Phoenix LiveView app, then deploying with Grafana and Tempo to store and query traces3.

Tempo is the most operationally demanding option here — you're running your own tracing infrastructure. But for teams that already operate Grafana or want maximum control at minimal cost, it's a solid choice. You get full OTel tracing data with no per-request or per-host fees.

How to choose

• Elixir-first team → AppSignal. It's the only tool with deep BEAM VM instrumentation and out-of-the-box framework support.
• Enterprise polyglot → Datadog or New Relic. You get breadth across languages and infrastructure, at the cost of shallower Elixir-specific insight.
• Open-source / self-host → SigNoz or Grafana Tempo. You get vendor-neutral OTel with full control, but you own the operational burden.

The Elixir OpenTelemetry ecosystem has matured significantly — opentelemetry_phoenix, opentelemetry_ecto, and opentelemetry_liveview make it viable to instrument Phoenix apps with any OTel-compatible backend3. That said, if you want BEAM VM metrics surfaced without manual instrumentation, AppSignal remains the path of least resistance1.

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