Press Information

Founding date

StormForger GmbH
October, 2014
Cologne, Germany


Press / Business Contact

Lars Wolff

Social Media

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StormForger GmbH
Kyffhäuserstr. 17
50674 Köln

Represented by Managing Directors:
Sebastian Cohnen
Lars Wolff


+49 221 64 30 51 28



StormForger is a Performance Testing as a Service platform, targeting HTTP APIs. We provide a comprehensive and expressive JavaScript DSL to specify your test cases. You can create your first test case, easily, in just three steps (see How It Works). A high degree of automation enables you to do continuous load and performance testing to make the web a faster place.

About the founders

StormForger was founded by Sebastian Cohnen and Lars Wolff.

Sebastian Cohnen (CTO) is an expert in web performance and architectures. His experience covers 7+ years of consulting and development. He has a strong focus on performance engineering and regular execution of dynamic performance analysis for customers.

Lars Wolff (CEO) focusses on large, technical ambitious web projects and products. He is experienced in 10+ years of consulting and development. He is a Certified ScrumMaster® and scores with his expertise in strategy, conception, product/project management and development.

Founder images

Sebastian Cohnen & Lars Wolff sebastian cohnen lars wolff pre
Sebastian Cohnen Sebastian cohnen pre
Lars Wolff Lars wolff pre

Application images

Have a look at our application and get an impression of its clarity and usability. You find an overview of a test case, concrete graphs, statistics by arrival phase and more.

Stormforger application overview Overview
Stormforger application graph Correlation Graph
Stormforger application httpcodes HTTP codes
Stormforger application statistics Statistics by arrival phases

Download all application images (.zip)

StormForger logo (black) logo anvil noclaim black
StormForger logo (white) logo anvil noclaim white

Download logo pack (.zip)

Create repeatable Performance & Load Tests easily using our JavaScript DSL to verify your HTTP APIs. StormForger enables you to do continuous performance testing to make the web a faster place. Learn more...


    duration: 5 * 60,  // 5min in seconds
    rate: 1.0,         // clients per seconds to launch

definition.session("hello world", function(session) {
  session.get("/", { tag: "root" });