Freedom251 › Performance Testing Software
Loader.io
What Loader.io is
Loader.io is a cloud-based service for stress testing web apps and APIs with concurrent connections. Users can register a target through the web interface or API, configure a test, and monitor it in real time. API test types include per-test, per-second, and maintain-load. Configuration can specify URL sequences, duration, client counts, timeouts, error thresholds, scheduled starts, and completion callbacks. Results summarize successes, errors, timeouts, network errors, transferred data, average response time, and average error rate. A target host must pass automated verification before testing, and each unique hostname must be added and verified separately. Tests currently run from Amazon’s US-east datacenter. Integrations include webhooks, TravisCI, CircleCI, Jenkins, TeamCity, GitHub Service Hooks, New Relic, and HipChat. Test webhooks can start a run with a POST request, and notification webhooks can report completion. The Free plan costs nothing, billed $0.00 / mo, with 10,000 clients per test, one target host, one-minute tests, and two URLs per test. Pro is $99.95 a month, billed $99.95 / mo.
Who it suits
Loader.io suits teams that need to load test web applications or APIs and monitor test results. The free plan covers one verified target host, while Pro lists support for unlimited target hosts and up to 100,000 clients per test.
What it does well
- Supports per-test, per-second, and maintain-load tests.
- Results include response times and error rates.
- Offers webhooks and integrations with CI tools.
- Free plan allows 10,000 clients per test.
What to know first
- Each hostname requires separate verification.
- Tests currently run from Amazon’s US-east datacenter.
- Free tests are limited to one minute and two URLs.
- Pro costs $99.95 a month.
Limits
The Free plan allows 10,000 clients per test, one target host, tests up to one minute, and two URLs per test. Pro costs $99.95 per month and supports 100,000 clients per test, unlimited target hosts, and unlimited 10-minute tests.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | $0.00 / mo · 10,000 clients / test · 1 target host · 1 min tests · 2 urls per test | Free |
| Pro | $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 | $99.95 a month |
As loader.io lists them, read 4 Oct 2026. The maker's own page has the final word.
Getting started
- Open loader.io and register a target through the web interface or API.
- Complete automated verification for each hostname you plan to test.
- Configure URL sequences, duration, client counts, timeouts, error thresholds, and any start time or callback.
- Run a test and monitor it in real time.
- Choose Free or Pro according to the host, client, URL, and test-duration limits you need.
Verdict
Loader.io provides configurable load tests and real-time monitoring for web apps and APIs. Its free tier is limited in host count, duration, and URLs; Pro costs $99.95 a month and includes priority support.
Questions
Is Loader.io free?
Yes. Its Free plan costs $0.00 per month. Pro costs $99.95 per month.
What platforms does Loader.io support?
The listed platforms are API and web. It is a cloud deployment.
What are the Free plan limits?
It allows 10,000 clients per test, one target host, one-minute tests, and two URLs per test.
What does Pro add?
For $99.95 per month, Pro supports 100,000 clients per test, unlimited target hosts, unlimited 10-minute tests, advanced analytics, concurrent tests, DNS verification, team features, priority loaders, and priority support.
Which integrations are available?
The Help Desk lists webhooks, TravisCI, CircleCI, Jenkins, TeamCity, GitHub Service Hooks, New Relic, and HipChat.
How are test hosts verified?
Target hosts must pass automated verification before tests can run, and each unique hostname must be added and verified independently.
Facts from Loader.io's own pages
- Host limit
- Each unique hostname must be added and verified independently. · loader.io, 4 Oct 2026
- Integrations
- The Help Desk lists webhooks, TravisCI, CircleCI, Jenkins, TeamCity, GitHub Service Hooks, New Relic, and HipChat integrations. · support.loader.io, 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. · support.loader.io, 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. · loader.io, 4 Oct 2026
- Results
- The results API provides summaries including successes, errors, timeouts, network errors, data transferred, average response time, and average error rate. · loader.io, 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. · loader.io, 4 Oct 2026
- Support
- The pricing FAQ directs users to [email protected] for questions and says paid plans include priority support. · loader.io, 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. · loader.io, 4 Oct 2026
- Test location
- The pricing FAQ says tests currently run from Amazon’s US-east datacenter. · loader.io, 4 Oct 2026
- Test types
- The API supports per-test, per-second, and maintain-load test types. · loader.io, 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. · loader.io, 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. · loader.io, 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. · support.loader.io, 4 Oct 2026
Where Loader.io stands on Freedom251
- Performance Testing Software#13 of 38