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2026 Comparison Guide

Gremlin vs. Harness Resilience Testing: What to Know

Both platforms run chaos experiments across broad infrastructure and offer AI-guided recommendations. The choice comes down to coverage and coupling — here's an honest comparison to help you decide.

50
%
Less
downtime
90
%
Faster DR testing
4 of 5
Largest
US banks

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Three Things to Consider Before You Choose

Both platforms offer chaos experiments and AI-guided recommendations. The right choice depends on your infrastructure, your delivery toolchain, and how you measure reliability.

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How much of your stack is Kubernetes?

Harness's most powerful capabilities — passive risk detection, PR gating, promotion gates — assume Kubernetes + Harness CD. If your risk spans bare metal, VMs, on-prem, or multi-cloud, coverage is the deciding factor.

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Do you want reliability tied to your delivery platform?

Harness RT is a module of the Harness platform. Its deepest capabilities assume Harness CD. Gremlin is a standalone platform with no ecosystem dependency.

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Do you need scores from tests, or scores from config analysis?

Harness derives risk scores from configuration and pipeline metadata. Gremlin's scores reflect what your systems actually did under failure.

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Side-by-Side Comparison

Gremlin vs. Harness, At a Glance

Where the two platforms overlap and where they diverge.

CapabilityGremlinHarness Resilience Testing
What it isDedicated reliability management platformModule within the Harness software delivery platform
InfrastructureBare metal, on-prem, AWS, Azure, GCP, multi-cloud, K8s, serverlessK8s, Linux, Windows, VMware, AWS, Azure, GCP; agentless cloud resources
Passive risk detectionAll environments the Gremlin agent coversKubernetes workloads and Harness CD pipeline metadata
Reliability scoringService-level score validated by executed tests + passive detectionResilience score per experiment + per-service score from configuration analysis
Failure typesComprehensive: state, resource, network, application, DR230+ faults across K8s, cloud, Linux, Windows, VMware
SafetyAuto rollback, global halt, granular blast radiusExperiment halt, ChaosGuard guardrails; rollback varies
PricingPer-agent, unlimited testsUser-based; Resilience Testing is Enterprise module
DR testingGA; centralized simulation with auditable reportingBehind feature flag; runs on K8s infrastructure
CI/CD integrationIntegrates with major CI/CD toolsNative — resilience tests built into Harness pipelines
Standalone productYes — no delivery platform requiredModule of Harness platform
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Key Differences

Where Harness and Gremlin Diverge

Both approaches have strengths. Here's where they differ most.

Harness

Deep within Harness CD + Kubernetes

  • Passive risk detection, PR gating, and promotion gates operate on K8s workloads and Harness CD metadata. Outside that boundary, you're running and interpreting experiments yourself.
Gremlin

Every environment, one model

  • Agents feed one reliability model across bare metal, VMs, K8s, and multi-cloud. Same scoring, same standards, same reporting regardless of infrastructure type.
Harness

Scores from configuration

  • Per-service Resilience Risk Score derived from reading K8s manifests, deployment config, and pipeline history. A prediction about how a service is configured.
Gremlin

Scores from executed tests

  • Service-level reliability score validated by actually breaking the service and measuring the response, combined with passive risk detection across every environment.
Harness

Per-user, enterprise module

  • User-based pricing. Resilience Testing sits in the Enterprise plan's Testing category, not the Essentials bundle. Service entitlements may also apply.
Gremlin

Per-agent, unlimited tests

  • Cost tracks infrastructure, not headcount. One plan, full platform.
Harness

Feature-flagged, Kubernetes-scoped

  • DR stage is gated behind a feature flag you request from sales. Runs against K8s chaos infrastructure.
Gremlin

Generally available, compliance-ready

  • Centralized DR simulation with auditable reporting. Top-5 US bank: 4,000 manual tests → full DR in 1/10 the time.
Saving Bank 1 Icon from Ultimate Regular set by streamlinehq.com

One of the largest banks in the world used Gremlin to go from running 4,000 distinct DR tests manually to completing full disaster recovery testing in a tenth of the time — a 90% reduction.

Gremlin in Production

What Enterprise Teams Achieve with Gremlin

50
%
Downtime reduction

At a Fortune 500 insurer

90
%
Faster DR testing

At a top-5 US bank

80
%
Testing time reduction

At a global auto parts retailer

60
Critical failure modes found

During 100M-customer migration

Gremlin allowed us to launch our new platform for Black Friday with zero major incidents.

“We developed our team's expertise to handle issues that other teams couldn't test. At the same time, we championed Chaos Engineering, demonstrating its value in rapidly evaluating various scenarios.”

Lead Performance Engineer

Sephora

Which Is the Right Fit?

Honest guidance to help you choose the right approach for your team.

Choose Harness Resilience Testing if...

  • Circle Streamline Icon: https://streamlinehq.com
    You're already a Harness customer, especially Harness CD
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    Your services are predominantly Kubernetes workloads
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    You want resilience gates inside pipelines you already run
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    You want chaos, load, and DR testing managed alongside deployments
  • You want to start on a free tier before committing budget

Gremlin is a better fit if...

  • Circle Streamline Icon: https://streamlinehq.com
    Your reliability risk spans bare metal, VMs, on-prem, serverless, or multi-cloud
  • Circle Streamline Icon: https://streamlinehq.com
    You want reliability scores validated by executed tests, not inferred from configuration
  • Circle Streamline Icon: https://streamlinehq.com
    You don't want your reliability program coupled to a delivery platform
  • Circle Streamline Icon: https://streamlinehq.com
    You need DR testing that is generally available today with compliance-ready reporting
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    You want costs tied to infrastructure rather than headcount
  • Circle Streamline Icon: https://streamlinehq.com
    You need a standalone platform, not a module within a broader ecosystem
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