TOOL SIGNAL / ACTIVE

NBomber

NBomber

Load Testing Commercial Self-hosted
Official site ↗ Source repo ↗
Pricing model
Free for personal use; organization and enterprise use require a paid license.
First released
2019
Last verified
Answer

NBomber lets teams define distributed load scenarios in C# or F# and run them from a console application or test suite. Official extensions cover HTTP, WebSockets, MQTT, AMQP, browser automation, Redis, MongoDB, and gRPC.

About

NBomber lets teams define distributed load scenarios in C# or F# and run them from a console application or test suite. Official extensions cover HTTP, WebSockets, MQTT, AMQP, browser automation, Redis, MongoDB, and gRPC.

Best for

  • Load Testing scenarios across typical web and service stacks
  • Organizations budgeting for commercial licenses or subscriptions
  • Groups comfortable scripting in C#, F#

Not the best fit when

  • Teams unwilling to operate generators, results storage, and scaling
  • Projects that require a fully free open-source stack only

Architecture and concurrency

NBomber is commonly operated as self-hosted software with scenario authoring in C#, F#. Concurrency and distribution depend on how you size workers or injectors.

Specs

Scripting
C#F#
Protocols
HTTPHTTPSWebSocketMQTTAMQPgRPC
Operating systems
WindowsmacOSLinux
Tags
.netcsharpfsharpcode-first
Repo health
★ 2236 · last push 2026-08-17

CATALOG LAST VERIFIED · 2026-08-12 · CURATED BY NAVEENKUMAR NAMACHIVAYAM

Frequently asked

ANSWER-SHAPED
Who is NBomber for?

NBomber is best for engineers designing load, stress, and performance tests for web and service systems. It is commercial software, typically licensed for larger or governed programs. Vendor: NBomber. Deployment model: self-hosted. Free for personal use; organization and enterprise use require a paid license.

How does NBomber differ from Apache JMeter?

Compared with Apache JMeter, NBomber is commercial while Apache JMeter is open source; scripting centers on C#, F# rather than Java, Groovy. NBomber lists protocols HTTP, HTTPS, WebSocket, MQTT, AMQP, gRPC; Apache JMeter lists HTTP, HTTPS, JDBC, JMS, FTP, TCP. Status is active versus active. Use the Test Rig to compare full specs side by side before a proof-of-concept.

What scripting language and concurrency model does NBomber use?

NBomber uses C#, F# for scripting or scenario definition. Runtime model: protocol-oriented virtual users configured through the product workflow. OS support: Windows, macOS, Linux. Protocols: HTTP, HTTPS, WebSocket, MQTT, AMQP, gRPC. Match these to how your team already authors tests and which systems you must drive under load.

What is the cloud or enterprise path for NBomber?

NBomber is primarily self-hosted; teams typically run generators on their own machines, CI runners, or private cloud. Plan for generator capacity, network access to targets, and result storage yourself. Pricing model: Free for personal use; organization and enterprise use require a paid license.

What are known limitations of NBomber?

NBomber limitations to weigh: self-hosted tools require you to provision, scale, and observe load generators yourself; commercial licensing and quotes can gate large-scale or enterprise use. Status: active. Always validate against your target protocols and scale with a proof-of-concept. Confirm details against the official site and a short proof-of-concept in your environment.