Is Envoy or Vespa better?

Neither clearly leads. Envoy starts at Free and Vespa at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, Envoy or Vespa?

Envoy starts at Free and Vespa at Free.

Does Envoy or Vespa run on more platforms?

Envoy runs on Web. Vespa runs on Web, Self-hosted.

Can I use Envoy for free?

Both have a free tier, so you can try either at no cost before committing.

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 Vespa is typically brought in for.

What can Envoy do that Vespa cannot?

Envoy covers xDS dynamic configuration, Protocol breadth, Filter chain architecture, Observability by default. Vespa covers Vector search, Text and structured search, Machine-learned ranking, Real-time serving.

Developer Tools · head to head

Envoy vs Vespa

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

Visit Envoy Full review

Vespa

Databases

Distributed AI search platform for retrieval, ranking, and inference

From: Free
Free plan: Yes

Visit Vespa Full review

The short version

Vespa is an open-source distributed serving engine.
Both are free.
Only Envoy lists xDS dynamic configuration; only Vespa lists vector search.
Where Vespa falls short: pricing not publicly listed, requires contacting sales.
Prices and features on this page were last checked on 13 November 2026.

Where they differ

Only the attributes on which Envoy and Vespa actually diverge.

Attributes where Envoy and Vespa differ
Attribute	Envoy	Vespa
Pricing model	Open-source	Contact-sales
Platforms	Web	Web, Self-hosted
Category	Developer Tools	Databases

Identical on both: starting price (Free), free tier (Yes).

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 Vespa

Vector search
Text and structured search
Machine-learned ranking
Real-time serving
SQL interface
Automatic scaling
Open-source

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 Vespa
An edge or API gateway that needs per-route retry budgets, circuit breaking and outlier detection rather than round-robin proxyingnot Vespa
Migrating traffic between service versions or between a monolith and its replacement, using weighted splits and shadow trafficnot Vespa
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 Vespa

Vespa

Build RAG systems with semantic search over documentsnot Envoy
Power e-commerce search with ML rankingnot Envoy
Create recommendation engines for personalizationnot Envoy
Implement real-time search for news or feedsnot Envoy
Deploy private semantic search over sensitive datanot 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

Vespa

Pricing not publicly listed, requires contacting sales
Steeper learning curve compared to simpler search tools
Operational complexity for self-hosted deployments
Smaller ecosystem compared to cloud-native alternatives

Pricing, plan by plan

Envoy

Free

No published plan breakdown. See the Envoy review.

Vespa

Free

No published plan breakdown. See the Vespa review.

Which should you pick?

Choose Envoy if

You need xds dynamic configuration.
You want to start without paying.
You also want protocol breadth.

Envoy review

Choose Vespa if

You need vector search.
You want to start without paying.
You work on Web, Self-hosted.
You also want text and structured search.

Vespa review

Questions people ask

Is Envoy or Vespa better?: Neither clearly leads. Envoy starts at Free and Vespa at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Envoy or Vespa?: Envoy starts at Free and Vespa at Free.
Does Envoy or Vespa run on more platforms?: Envoy runs on Web. Vespa runs on Web, Self-hosted.
Can I use Envoy for free?: Both have a free tier, so you can try either at no cost before committing.
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 Vespa is typically brought in for.
What can Envoy do that Vespa cannot?: Envoy covers xDS dynamic configuration, Protocol breadth, Filter chain architecture, Observability by default. Vespa covers Vector search, Text and structured search, Machine-learned ranking, Real-time serving.

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.

Vespa: Is Vespa open-source?

Yes, Vespa is open-source under the Apache 2.0 license. The code is available on GitHub, and you can self-host or use the managed cloud service.

Source

Envoy: 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.

Vespa: What latency can Vespa achieve?

Vespa is designed for sub-100 millisecond latencies with thousands of queries per second, suitable for real-time search and recommendation applications.

Source

Envoy: 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.

Vespa: Does Vespa support vector search?

Yes, Vespa provides native vector search capabilities alongside text, structured data, and tensor operations for building comprehensive search and AI applications.

Source

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.

Vespa: What is the pricing model for Vespa Cloud?

Vespa Cloud pricing is not publicly listed and requires contacting their sales team to discuss your specific use case and scale requirements.

Source

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.

Envoy vs Vespa

Envoy

Vespa

The short version

Where they differ

What each one covers

Only in Envoy

Only in Vespa

What people use each for

Envoy

Vespa

Where each one falls short

Envoy

Vespa

Pricing, plan by plan

Envoy

Vespa

Which should you pick?

Choose Envoy if

Choose Vespa if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on Envoy

More on Vespa

Keep looking

Other head to heads