No. 23 of 34 ·Performance Testing Software

Loader.io

Web · API · paid plans from $99.95/mo

Freedom report

One barScore 5.2

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedThinly documented

Loader.io is ranked #23 of 34 in performance testing software on Freedom251. It runs on API, Web. There is a free plan. Paid plans start at $99.95/mo.

Loader.io plans and pricing

All plans

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

Pro $99.95/mo $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 loader.io · 4 Oct 2026

Compared on performance testing software

Free plan: Yes
Paid from: $99.95/mo
Load testing: Yes
Stress testing: Yes
Distributed load: Yes
API testing: Yes
Deployment model: cloud
Max virtual users: 100,000 users

Best Loader.io alternatives

See all 12

Two bars Artillery Free tier No. 1$199/mo6.6 Two bars Locust Free tier No. 2Free6.6 Two bars Taurus Free tier No. 3Free6.6 Two bars Apache JMeter Free tier No. 4Free6.5 One bar Grafana k6 Free tier No. 5$19/mo6.4 One bar LoadFocus Free tier No. 6$15.80/mo6.4

The record

Purpose: Loader.io is a cloud-based load testing service for stress testing web apps and APIs with thousands of concurrent connections.
Test workflow: Users can register a target through the web interface or API, run a test, and monitor it in real time.
Test types: The API supports per-test, per-second, and maintain-load test types.
Test configuration: Tests can include a sequence of URLs, a duration, client counts, timeouts, error thresholds, scheduled start times, and completion callbacks.
Results: The results API provides summaries including successes, errors, timeouts, network errors, data transferred, average response time, and average error rate.
Verification: Loader.io requires target hosts to pass automated verification before tests, to help prevent using the service to attack sites without their consent.
Host limit: Each unique hostname must be added and verified independently.
Test location: The pricing FAQ says tests currently run from Amazon’s US-east datacenter.
Integrations: The Help Desk lists webhooks, TravisCI, CircleCI, Jenkins, TeamCity, GitHub Service Hooks, New Relic, and HipChat integrations.
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.
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.
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.
Support: The pricing FAQ directs users to [email protected] for questions and says paid plans include priority support.
Price from: $99.95/mo

Where it ranks on Freedom251

Best Performance Testing Software in 2026#23 of 34

Is Loader.io yours?

Claim it for free: prove the domain, then correct facts, plans and screenshots. An editor reviews every change.

Claim it free Promote Loader.io

Sources

loader.io· checked 4 Oct 2026
loader.io/docs/v2/· checked 4 Oct 2026
loader.io/blog/howto/target-host-verification/· checked 4 Oct 2026
loader.io/pricing· checked 4 Oct 2026
support.loader.io/category/12-integrations· checked 4 Oct 2026
support.loader.io/article/23-webhook· checked 4 Oct 2026
support.loader.io/article/76-new-relic-insights· checked 4 Oct 2026