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Loader.io

Loader.io is a cloud-based service for stress testing web applications and APIs with concurrent connections.

Place
#15 of 38
Score
6.5
Loader.io's website

What Loader.io is

Loader.io is a cloud-based service for stress testing web applications and APIs with concurrent connections. A target can be registered through the web interface or API, then tested and monitored in real time. Its API supports per-test, per-second, and maintain-load test types. Configurations can specify URL sequences, duration, client counts, timeouts, error thresholds, scheduled starts, and completion callbacks. Results include successes, errors, timeouts, network errors, data transferred, average response time, and average error rate. Before a test can run, the target host must pass automated verification, and each unique hostname must be added and verified independently. Tests run from Amazon’s US-east datacenter. The free plan allows 10,000 clients per test, one target host, one-minute tests, and two URLs per test. Pro costs $99.95 a month and allows up to 100,000 clients per test, unlimited target hosts, and tests up to 10 minutes. Listed integrations include webhooks, Jenkins, CircleCI, New Relic, and GitHub Service Hooks.

Good

  • Runs tests through a web interface or API
  • Supports three API test types
  • Monitors tests in real time
  • Results include response and error measures
  • Integrates with webhooks and development tools

Watch out

  • Each unique hostname requires separate verification
  • Free plan allows one target host
  • Free tests are limited to one minute
  • Tests run from Amazon’s US-east datacenter

Who it suits

Loader.io suits developers or teams who need to exercise web applications or APIs under concurrent load and review test results. It is a fit for users able to verify each target hostname before testing.

Verdict

Loader.io provides configurable cloud load tests and real-time monitoring, with result summaries for errors, traffic, and response times. The free plan has tight host, duration, and URL limits; Pro costs $99.95 a month and raises several of those caps.

Plans and prices

From Loader.io's own pricing page, checked 4 Oct 2026.

All about pricing
PlanPriceWhat it gives you
FreeFree10,000 clients / test · 1 target host · 1 min tests · 2 urls per test · $0.00 / mo
Pro$99.95 a month100,000 clients / test · unlimited target hosts · unlimited 10 min tests · 10 urls per test · advanced analytics · concurrent tests · DNS Verification · team features · priority loaders · priority support · $99.95 / mo

The facts

Each one read from Loader.io's own pages, with the date it was checked.

What it does

Host limit
Each unique hostname must be added and verified independently.checked 4 Oct 2026
Integrations
The Help Desk lists webhooks, TravisCI, CircleCI, Jenkins, TeamCity, GitHub Service Hooks, New Relic, and HipChat integrations.checked 4 Oct 2026
New Relic
Loader.io can send test results to New Relic Insights in real time and to New Relic, whose dashboard updates at a stated limit of once per minute.checked 4 Oct 2026
Purpose
Loader.io is a cloud-based load testing service for stress testing web apps and APIs with thousands of concurrent connections.checked 4 Oct 2026
Results
The results API provides summaries including successes, errors, timeouts, network errors, data transferred, average response time, and average error rate.checked 4 Oct 2026
Security
The maker says load generator IP addresses can change between tests and provides an API endpoint for retrieving the current addresses for allow-listing.checked 4 Oct 2026
Support
The pricing FAQ directs users to [email protected] for questions and says paid plans include priority support.checked 4 Oct 2026
Test configuration
Tests can include a sequence of URLs, a duration, client counts, timeouts, error thresholds, scheduled start times, and completion callbacks.checked 4 Oct 2026
Test location
The pricing FAQ says tests currently run from Amazon’s US-east datacenter.checked 4 Oct 2026
Test types
The API supports per-test, per-second, and maintain-load test types.checked 4 Oct 2026
Test workflow
Users can register a target through the web interface or API, run a test, and monitor it in real time.checked 4 Oct 2026
Verification
Loader.io requires target hosts to pass automated verification before tests, to help prevent using the service to attack sites without their consent.checked 4 Oct 2026
Webhook automation
A test-specific run webhook can trigger a test with a POST request, and a notification webhook can receive a POST when a test completes.checked 4 Oct 2026

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