Transaction-aware load testing for distributed systems

Test transactions. Not just endpoints.

Load test the workflows that matter.

Follow one transaction across APIs, queues, services, and browser steps so the report shows what really slowed down.

Keep load generation, correlation, and reporting in one runtime instead of stitching results together after the run.

  • End-to-end transaction testing across systems
  • Multi-language SDK (C#, Java, Python, TS/JS)
  • Built for APIs, Kafka, and event-driven architectures
  • Correlate performance across services, not just endpoints
Direct answer

What is LoadStrike?

LoadStrike is a self-hosted transaction load testing platform for engineering teams that need to measure complete workflows across APIs, event streams, browser journeys, and downstream services.

Instead of stopping at the first request, LoadStrike correlates source and destination activity so teams can see whether the business path still completed correctly and on time under load.

Explore by workload

Choose the load-testing path that matches the system you actually run

These category pages are the fastest way to move from a broad product question into the specific transaction shape, docs, comparisons, and integrations that matter next.

Why LoadStrike?

Outcome-based load testing for systems with more than one hop.

Move beyond endpoint checks and validate the transaction paths that actually define system health.

LoadStrike frames load as a real transaction story, from API ingress through asynchronous handoffs and back into correlated system behavior.

Architecture context

Model the system as it actually behaves under load

Most production paths cross more than one boundary before the business outcome is visible.

LoadStrike keeps those APIs, streams, and service handoffs inside one measured transaction so teams can reason about the whole path.

APIs Kafka Microservices Correlation Reports SDKs
API ingress

Drive realistic requests into the transaction paths that trigger downstream work.

Event streams

Keep Kafka and asynchronous handoffs inside the same test story instead of bolting them on later.

Service graph

Measure how internal services and dependencies behave when one workflow fans out under load.

Workflow

How LoadStrike works

Define the transaction, execute real load, and keep the result correlated across the systems involved.

01 Define your transaction

Model real workflows across APIs and services.

02 Execute load

Simulate thousands of concurrent transactions.

03 Correlate results

Understand performance across systems, not just endpoints.

Common questions

Questions teams ask before they move beyond endpoint-only testing

These answers summarize where LoadStrike fits best before you dive into the quick start or transport-specific documentation.

What does transaction load testing mean in LoadStrike?

In LoadStrike, transaction load testing means measuring the full workflow that matters to the business, not just the first request. A scenario can start at an API or browser action, continue through queues and services, and report whether the downstream completion still happened inside the expected time window.

When is LoadStrike a better fit than an endpoint-only load tool?

LoadStrike is a better fit when success is visible only after the first hop, such as event-driven processing, browser-driven workflows, or service chains that fan out into downstream systems. Those cases need correlation and grouped reporting, not only ingress throughput and response latency.

Which SDKs and workflow types does LoadStrike support?

LoadStrike keeps one public model across C#, Java, Python, TypeScript, and JavaScript. Teams can use that shared runtime for API traffic, browser journeys, Kafka and other stream transports, grouped correlation analysis, and self-hosted coordinator-agent execution where the plan allows it.

Can LoadStrike combine browser, API, and async system behavior in one report?

Yes. LoadStrike can run browser actions, API calls, and downstream event tracking inside one scenario so the final report reflects the whole user or business journey. That makes it easier to compare where latency entered the path instead of reading disconnected tools after the run.

Comparison

Why not just use k6 or JMeter?

k6 and JMeter test endpoints. LoadStrike tests how your entire system behaves under load.

From APIs to event streams to cross-service transactions — LoadStrike gives you the full picture.

Category LoadStrike Preferred k6 JMeter
Focus Transactions (end-to-end systems) HTTP/API endpoints Protocol-level testing
Architecture awareness Multi-system (API + Kafka + flows) Mostly HTTP Limited
Transaction correlation Built-in Manual / limited Very limited
Event-driven systems (Kafka, streams) Native support No native support Plugin-dependent / weak
Real user journeys First-class concept Scripted manually Complex to model
Developer experience Code-first, multi-language Strong JS-based DX GUI-heavy, legacy feel
Modern distributed system support Yes Partial Weak
Observability across systems Correlated insights Endpoint-focused Limited
Setup complexity Lightweight SDK Simple Heavy
Best use case Full system performance validation API load testing Legacy protocol/load simulation
The positioning in one frame
k6

Did this endpoint respond?

JMeter

Did the protocol handle load?

LoadStrike

Did your entire system survive a real transaction?

Use cases

Use cases

Start with the transaction patterns that matter most to platform, QA, and engineering teams.

Microservices Microservices systems

Test cross-service performance under real load.

Event-driven Event-driven architectures

Simulate Kafka and asynchronous workflows.

End to end End-to-end user journeys

Validate full transaction flows, not isolated calls.

Code example

Define transactions in code and keep the workflow explicit.

LoadStrike scenarios stay close to the systems they validate, so engineers can name the transaction, shape the load, and correlate the result without switching tools.

C# example orders transaction
var scenario = LoadStrikeScenario.Create("orders", async context =>
{
    var step = await LoadStrikeStep.Run<string>(
        "publish-order",
        context,
        () => Task.FromResult(LoadStrikeResponse.Ok<string>(statusCode: "200")));

    return step.AsReply();
})
.WithLoadSimulations(
    LoadStrikeSimulation.Inject(10, TimeSpan.FromSeconds(1), TimeSpan.FromSeconds(20))
);

LoadStrikeRunner.RegisterScenarios(scenario)
    .WithRunnerKey("rkl_your_local_runner_key")
    .Run();
Get started

Start testing real transactions today.

Model the workflow that already matters to your team, run it under true load, and see how the whole system behaves.