Developer Tools · head to head
Envoy vs Splunk Enterprise Security
Envoy
Developer Tools
A high-performance L7 proxy written in C++ that is configured by an API rather than a config file, and is usually deployed under a control plane.
- From
- Free
- Free plan
- Yes
Splunk Enterprise Security
Cybersecurity
The platform for operational intelligence
- From
- On request
- Free plan
- No
The short version
- Splunk Enterprise Security is a SIEM solution.
- Both are free.
- Only Envoy lists xDS dynamic configuration; only Splunk Enterprise Security lists security monitoring.
- Where Splunk Enterprise Security falls short: Splunk Enterprise Security is licensed separately from the Splunk platform, so a SIEM deployment needs both.
- Prices and features on this page were last checked on 13 November 2026.
Where they differ
Only the attributes on which Envoy and Splunk Enterprise Security actually diverge.
| Attribute | Envoy | Splunk Enterprise Security |
|---|---|---|
| Starting price | Free | On request |
| Pricing model | Open-source | Subscription |
| Free tier | Yes | No |
| Platforms | Web | Web, API |
| Category | Developer Tools | Cybersecurity |
Not yet recorded: founded for Envoy.
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Envoy
- xDS dynamic configuration
- Protocol breadth
- Filter chain architecture
- Observability by default
- Outlier detection
- Traffic shaping
- mTLS termination and origination
- Hot restart
Only in Splunk Enterprise Security
- Security monitoring
- Incident review
- Risk-based alerting
- Threat intelligence
- Investigation workbench
- MITRE ATT&CK mapping
- Automated response
- Compliance reporting
What people use each for
The jobs each tool is most often brought in to do.
Envoy
- Acting as the data plane under a service mesh or Gateway API implementation, which is how the overwhelming majority of deployments use itnot Splunk Enterprise Security
- An edge or API gateway that needs per-route retry budgets, circuit breaking and outlier detection rather than round-robin proxyingnot Splunk Enterprise Security
- Migrating traffic between service versions or between a monolith and its replacement, using weighted splits and shadow trafficnot Splunk Enterprise Security
- Standardising observability across a polyglot estate, so that latency, error rates and tracing look the same regardless of the language a service is written innot Splunk Enterprise Security
Splunk Enterprise Security
- Running a security operations centre on Splunk indexed log datanot Envoy
- Correlation searches, risk based alerting and incident investigationnot Envoy
- Compliance reporting from pooled security telemetrynot Envoy
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Envoy
- The configuration surface is very large and hand-written bootstrap YAML runs to hundreds of lines for routing that Nginx expresses in twenty, which is why nearly every production deployment sits under a control plane and inherits that control plane's constraints as well
- xDS is the real API and it is not stable in the comfortable sense; the v2 API set was removed outright, resource types continue to be deprecated, and your control plane and Envoy binaries have to be upgraded roughly in step or the proxies stop accepting configuration
- Extending it properly means writing a C++ filter and building and maintaining your own Envoy binary; the alternatives are Lua, which adds per-request overhead, and proxy-wasm, whose ABI has remained effectively experimental for years with a real performance cost
- At sidecar density the per-proxy memory and CPU footprint is a measurable share of cluster capacity, since thousands of workloads each carry a full proxy, and this is precisely the cost that has pushed mesh projects towards node-level or ambient architectures
- There is no single vendor selling support for Envoy itself; you get the community plus control-plane vendors such as Solo.io and Tetrate, so an Envoy-level production bug is your own engineers in a C++ codebase unless a support contract happens to cover it
- Diagnosing why a request got a particular response involves reading config dumps, the stats endpoint and the RESPONSE_FLAGS codes in access logs rather than a readable error, which is a specific skill you must hire or spend months growing
Splunk Enterprise Security
- Splunk Enterprise Security is licensed separately from the Splunk platform, so a SIEM deployment needs both
- Splunk publishes no rate for Enterprise Security and directs buyers to contact a pricing expert
- UEBA, SOAR and automated threat analysis require the Premier edition rather than Essentials
- The platform underneath can be billed by ingest volume, workload or activity, so the total cost depends on a pricing model chosen at contract time rather than a list price
Pricing, plan by plan
Envoy
FreeNo published plan breakdown. See the Envoy review.
Splunk Enterprise Security
On request- Workload PricingFree
- Pay per compute
- Flexible scaling
- All features
- Ingest PricingFree
- Pay per GB ingested
- Predictable costs
- All features
- Entity PricingFree
- Pay per monitored entity
- Security focused
- All features
Which should you pick?
Choose Envoy if
- You need xds dynamic configuration.
- You want to start without paying.
- You also want protocol breadth.
Choose Splunk Enterprise Security if
- You need security monitoring.
- You work on Web, API.
- You also want incident review.
Questions people ask
- Is Envoy or Splunk Enterprise Security better?
- Neither clearly leads. Envoy starts at Free and Splunk Enterprise Security at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Envoy or Splunk Enterprise Security?
- Envoy has a free tier; the other does not. Paid plans start at Free for Envoy and On request for Splunk Enterprise Security.
- Does Envoy or Splunk Enterprise Security run on more platforms?
- Envoy runs on Web. Splunk Enterprise Security runs on Web, API.
- Can I use Envoy for free?
- Yes. Envoy has a free tier, so you can try it without paying. Splunk Enterprise Security starts at On request.
- What is Envoy best used for?
- Envoy is most often used for acting as the data plane under a service mesh or gateway api implementation, which is how the overwhelming majority of deployments use it, an edge or api gateway that needs per-route retry budgets, circuit breaking and outlier detection rather than round-robin proxying, migrating traffic between service versions or between a monolith and its replacement, using weighted splits and shadow traffic, standardising observability across a polyglot estate, so that latency, error rates and tracing look the same regardless of the language a service is written in. Of those, acting as the data plane under a service mesh or gateway api implementation, which is how the overwhelming majority of deployments use it and an edge or api gateway that needs per-route retry budgets, circuit breaking and outlier detection rather than round-robin proxying are not what Splunk Enterprise Security is typically brought in for.
- What can Envoy do that Splunk Enterprise Security cannot?
- Envoy covers xDS dynamic configuration, Protocol breadth, Filter chain architecture, Observability by default. Splunk Enterprise Security covers Security monitoring, Incident review, Risk-based alerting, Threat intelligence.
Answered from the vendors’ own pages
Envoy: Should I run Envoy on its own, or under a control plane?
Almost always under one. Directly authoring xDS or static bootstrap configuration is viable for a handful of routes and becomes unmanageable beyond that. Envoy Gateway, Istio, Contour, Gloo and Consul all exist to generate that configuration for you.
Splunk Enterprise Security: How much does Splunk Enterprise Security cost?
Splunk Enterprise Security pricing is not published. The product is available in Essentials Edition with threat detection, investigation, and response capabilities, and Premier Edition with UEBA, SOAR, and Automated Threat Analysis. Customers must contact Splunk sales for pricing quotes on either edition.
SourceEnvoy: How does it compare with Nginx or HAProxy?
Envoy is dynamically configured over an API and instrumented far more heavily; Nginx and HAProxy are faster to configure and lighter for straightforward reverse proxying. If you never need to change routing without a reload, Envoy is more machinery than the problem requires.
Splunk Enterprise Security: What editions of Splunk Enterprise Security are available?
Splunk Enterprise Security offers Essentials Edition with threat detection, investigation, and response capabilities, and Premier Edition which adds UEBA (User and Entity Behavior Analytics), SOAR (Security Orchestration, Automation and Response), and Automated Threat Analysis.
SourceEnvoy: What does it cost?
Nothing to licence; it is Apache 2.0 and there is no paid edition. The cost is engineering time and, for most organisations, a commercial control plane or cloud service that packages it.
Envoy: Can I write extensions without C++?
You can write Lua filters or proxy-wasm modules in Rust, Go, C++ or AssemblyScript. Both carry per-request overhead compared with a native filter, and the Wasm path has been slower to stabilise than the project originally projected.
Envoy: Is it a CNCF project?
Yes, it is a graduated CNCF project licensed under Apache 2.0, which means the trademark and governance sit with the foundation rather than with Lyft or any vendor.
Related pages
More on Splunk Enterprise Security
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