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Loader.io

loader.io

From $99.95/mo Free plan WebAPI
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Spec score 8.0 #16 of 38 in Performance Testing Software

Spec sheet

Purpose
Loader.io is a cloud-based load testing service for stress testing web apps and APIs with thousands of concurrent connections.Read 4 Oct 2026 · loader.io
Integrations
The Help Desk lists webhooks, TravisCI, CircleCI, Jenkins, TeamCity, GitHub Service Hooks, New Relic, and HipChat integrations.Read 4 Oct 2026 · support.loader.io
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.Read 4 Oct 2026 · loader.io
Support
The pricing FAQ directs users to [email protected] for questions and says paid plans include priority support.Read 4 Oct 2026 · loader.io
Host limit
Each unique hostname must be added and verified independently.Read 4 Oct 2026 · loader.io
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.Read 4 Oct 2026 · support.loader.io
Results
The results API provides summaries including successes, errors, timeouts, network errors, data transferred, average response time, and average error rate.Read 4 Oct 2026 · loader.io
Test configuration
Tests can include a sequence of URLs, a duration, client counts, timeouts, error thresholds, scheduled start times, and completion callbacks.Read 4 Oct 2026 · loader.io
Test location
The pricing FAQ says tests currently run from Amazon’s US-east datacenter.Read 4 Oct 2026 · loader.io
Test types
The API supports per-test, per-second, and maintain-load test types.Read 4 Oct 2026 · loader.io
Test workflow
Users can register a target through the web interface or API, run a test, and monitor it in real time.Read 4 Oct 2026 · loader.io
Verification
Loader.io requires target hosts to pass automated verification before tests, to help prevent using the service to attack sites without their consent.Read 4 Oct 2026 · loader.io
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.Read 4 Oct 2026 · support.loader.io

Plans and prices

Free Free $0.00 / mo 10,000 clients / test · 1 target host · 1 min tests · 2 urls per test Read 4 Oct 2026 · loader.io
Pro $99.95 a month $99.95 / mo 100,000 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 Read 4 Oct 2026 · loader.io

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