Simple cloud-based load testing for your apps - by SendGrid Labs Starting at $0/mo.

Can your app take it?

Measure how your app performs under pressure. Easily send as many connections as you need over the time you want and watch us crush your app in real-time to see how it performs.

Test as much as you need

When making constant changes and deploying new code, it’s just as important to test scalability as it is functionality. Because of this we encourage you to test as much as you need. You can even integrate loader io into your continuous processes via our super simple API

Share your tests with anyone & show off

Show off how your app performs by sharing your tests with anyone. Easily share the full results or use our code snippets to embed graphs into your blog or backend ops dashboard.

Real-time results

Watch our pretty graphs in real-time as your load tests run to see how your app is performing.

Region Availability

The available application locations for this add-on are shown below, and depend on whether the application is deployed to a Common Runtime region or Private Space. Learn More

  • Common Runtime
  • Private Spaces
Region Available
United States Available
Europe Available
Region Available Installable in Space

Plans & Pricing

    • Concurrent Users 10,000
    • URLs Per Test 3
    • Max Test Duration 1 minute
    • Priority Loader Servers
    • Concurrent Tests
    • Applications (hostnames) 1
    • Priority Email Support
    • SSL Support
    • Unlimited Tests
    • Concurrent Users 100,000
    • URLs Per Test 10
    • Max Test Duration 10 minutes
    • Priority Loader Servers
    • Concurrent Tests
    • Applications (hostnames) Unlimited
    • Priority Email Support
    • SSL Support
    • Unlimited Tests
Install loader.io
heroku addons:create loaderio

To provision, copy the snippet into your CLI or use the install button above.

loader.io Documentation