# Loader.io

> Loader.io is a freemium, vendor-hosted cloud load testing service from Loader.io, scripted in None.

- Canonical: https://perf.jmeter.ai/tools/loaderio/
- Review: https://perf.jmeter.ai/reviews/loaderio/
- Official: https://loader.io/

- Vendor: Loader.io
- Category: Cloud Load Testing
- License: Freemium — Free tier; Pro is USD 99.95 per month.
- Deployment: Cloud
- Status: Active
- Scripting: None
- Protocols: HTTP, HTTPS
- OS support: Browser
- First released: 2011

- Last verified: 2026-08-11

## What it is
Loader.io runs short-lived HTTP load tests from the cloud and provides basic result charts. It is designed for quick endpoint and application checks.

## Choose it when
- Teams that want managed load generation without operating injectors
- Teams that want a free tier before committing to paid capacity
- Groups comfortable scripting in None

## Look elsewhere when
- Strictly air-gapped environments with no approved cloud path

## Architecture
Loader.io runs as a cloud service: scenarios use None, while generators and orchestration are vendor-managed.

## Pricing
Loader.io offers a free plan and a Pro subscription plan starting at $99.95/month. Add-ons are available for extending test duration at $25 per 10-minute increment. Pro plans are billed month-to-month.

## Compare
- [Loader.io alternatives](https://perf.jmeter.ai/alternatives/loaderio/)

## FAQ
### Who is Loader.io for?
Loader.io is best for teams that want managed load generation without operating generators themselves. It offers a freemium path, so teams can start small before buying capacity. Vendor: Loader.io. Deployment model: cloud. Free tier; Pro is USD 99.95 per month.

### How does Loader.io differ from Grafana Cloud k6?
Compared with Grafana Cloud k6, scripting centers on None rather than JavaScript, TypeScript. Loader.io lists protocols HTTP, HTTPS; Grafana Cloud k6 lists HTTP, HTTPS, WebSocket, gRPC. 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 Loader.io use?
Loader.io uses None for scripting or scenario definition. Runtime model: protocol-oriented virtual users configured through the product workflow. OS support: Browser. Protocols: HTTP, HTTPS. 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 Loader.io?
Loader.io is cloud-hosted: you run tests on vendor-managed infrastructure without operating load generators yourself. That usually speeds ramp-up for distributed load while shifting capacity planning and data residency to the vendor. Pricing model: Free tier; Pro is USD 99.95 per month.

### What are known limitations of Loader.io?
Loader.io limitations to weigh: cloud services trade operational simplicity for vendor pricing, data residency, and network path differences versus your production topology. 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.

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Curated by NaveenKumar Namachivayam (QAInsights) · methodology: https://perf.jmeter.ai/about/#methodology · corrections: https://github.com/QAInsights/Performance-Testing-Tools/issues/new?title=Tool%20submission%3A%20&body=Tool%20name%3A%20%0AOfficial%20URL%3A%20%0AWhat%20should%20be%20added%20or%20corrected%3F%20%0A