What is Loader.io?
Loader.io is a free cloud-based HTTP load testing service originally built by SendGrid (now part of Twilio). It runs simple URL-based load tests from a single AWS region (US-East), using a domain-verification token to ensure you only test sites you own. The product is focused on the simplest possible workflow: enter a URL, set concurrent users, run a test for up to a few minutes, and view a basic report by email.
Loader.io has a generous free tier that has made it popular for quick capacity sanity checks. It supports basic GET/POST requests with custom headers, three test types (clients-per-second, total-clients, maintenance), and email-based result delivery. There is no scripting, no JMeter or k6 support, and no multi-step user journey capability.
When Loader.io is enough
Loader.io is genuinely useful for these jobs:
- Quick capacity sanity checks. "Can my new endpoint handle 1,000 users for one minute?". Loader.io's free tier answers that in two minutes flat.
- Single-URL throughput tests. If you have one endpoint and want to know its breaking point under naive HTTP load, Loader.io is the lowest-friction tool that exists.
- Domain-owner verification workflows. Loader.io's upfront domain verification (placing a token file on your server) is genuinely useful when you don't want to accidentally test someone else's site.
- Free, no-credit-card needed. A truly free tier, most paid SaaS load testers don't match Loader.io's no-payment baseline.
If your need is "hit one URL with N users from US-East and look at a chart", Loader.io does that without any setup overhead.
Where Loader.io stops being enough
Loader.io's simplicity comes with structural limits that real-world load testing usually pushes past:
- Single region (US-East only). All requests originate from one AWS region. No way to test from Europe, Asia, or Latin America. Geographic latency and CDN behavior under load are invisible.
- No scripting. Cannot extract a session token from one response and use it in the next. Cannot model a user journey (login → browse → cart → checkout). A test is a short list of URLs: 2 on the free plan, 10 on Pro.
- No JMeter or k6 support. If you have existing test scripts in either format, Loader.io can't run them.
- Test duration limited. Free tier tops out at one minute; the paid Pro plan allows tests of up to 10 minutes. Soak tests over hours are not supported.
- Limited integrations. Webhook callbacks exist, but there's no native CI/CD integration, no Jenkins plugin, no GitHub Action.
- Shallow reports. Email-delivered summary with basic charts. No drill-down into individual request errors, no shareable interactive dashboards, no historical trend analysis across runs.
LoadFocus vs Loader.io: feature comparison
The table below compares LoadFocus's entry-tier cloud plan against Loader.io's standard offering. Pricing accurate as of October 2026; Loader.io figures from the Loader.io pricing page.
| Feature | LoadFocus | Loader.io |
|---|---|---|
| Cost | Free tier; paid from $29/mo ($19/mo billed yearly) | Free tier; Pro $99.95/mo |
| Cloud regions | 25+ globally | 1 (US-East) |
| Max concurrent users | 1,500 (Basic) → 20,000 (Enterprise) | 10,000 (free) → 100,000 (Pro) |
| Max test duration | 1 min (Free), 20 min (Starter), 1 h (Basic), 5 h (Essential and up) | 1 min (free) → 10 min (Pro) |
| Multi-step user journeys | Yes (UI builder, JMeter or k6 scripts) | No (2 URLs per test on Free, 10 on Pro, no scripting) |
| JMeter (.jmx) support | Yes (upload and run) | No |
| k6 JavaScript scripting | Yes | No |
| Dynamic data extraction (tokens, IDs) | Yes | No |
| HTTP/2 and HTTP/3 | HTTP/2 yes, HTTP/3 no | HTTP/1.1 only |
| Live monitoring during test | Yes | Limited |
| Shareable result links | Yes | Email summary only |
| CI/CD integration | GitHub Actions, Jenkins, CLI | Webhook callbacks only |
| AI-generated analysis | Yes (all plans) | No |
| Page speed and API monitoring | Included | Not available |
When LoadFocus is the right upgrade from Loader.io
If you've outgrown "hit one URL from US-East", LoadFocus addresses the structural limits Loader.io was never designed to cross.
You need to test from multiple regions
Loader.io runs all tests from US-East. LoadFocus runs from 25+ regions, and on Pro and Enterprise a single test can split its load across several regions at once. If your users are global, your load tests should be too, otherwise you're only testing how your CDN behaves at the edge nearest to AWS US-East.
You need to test multi-step user journeys
Real load testing simulates real users. Real users log in, navigate, add to cart, checkout. Loader.io requests a short, fixed list of URLs; LoadFocus models full journeys with realistic think times, dynamic tokens, and conditional branching.
You want to run existing JMeter or k6 scripts in the cloud
If your team has invested in JMeter .jmx files or k6 JavaScript scripts, LoadFocus runs them in the cloud without you managing JMeter masters/slaves or k6 infrastructure. Loader.io can't run either format.
You need shareable reports beyond email
Loader.io emails a summary. LoadFocus produces a shareable URL with charts, percentile distributions, error breakdowns, request-level drilldown, and a written AI summary. Stakeholders click a link, not parse a CSV attachment.
You need integrated CI/CD with build-failing assertions
Loader.io offers webhook callbacks but no native CI integration. LoadFocus provides a CLI, a GitHub Action, and Jenkins integration that fail your build when SLOs regress, making load testing part of the deploy pipeline rather than a manual check.
Migration from Loader.io
If you have an existing Loader.io test:
- Sign up at loadfocus.com/signup.
- Create a new HTTP load test, paste the URL, set concurrent users to match your Loader.io configuration.
- Pick a cloud region for the load to originate from, starting with the one nearest your users. On Pro and Enterprise you can split the load across several regions.
- Add headers and POST body if you used them in Loader.io.
- Run the test. The result link is shareable.
For multi-step flows that Loader.io can't express at all, write a short k6 script or upload a JMeter .jmx file. LoadFocus runs both from the cloud.
FAQ: LoadFocus vs Loader.io
Is Loader.io still maintained?
Loader.io remains operational under SendGrid/Twilio ownership and continues to handle requests. Feature development has slowed in recent years, but the existing functionality works. For simple URL throughput tests it remains a viable free option.
Does LoadFocus have a free tier comparable to Loader.io's?
Yes, with different limits. The LoadFocus free plan runs tests of up to 10 virtual users for 1 minute, up to 3 runs a day, from US East (N. Virginia); paid plans can pick any of the 25+ regions. Loader.io's free tier allows far more clients (10,000) but only from US-East, for 1 minute, against one host. Pick LoadFocus free for scripted checks or tests from other regions, Loader.io free for a quick high-volume hit on a single host.
Can LoadFocus replicate Loader.io's domain verification?
No. LoadFocus does not ask you to verify domain ownership with a token file. Team owners control who can create and run tests through team roles. You are responsible for testing only systems you own or have written permission to test; many teams also tell their hosting provider or CDN before a large test so it is not mistaken for an attack.
Does LoadFocus support the same test types as Loader.io (clients-per-second, total-clients, maintenance)?
LoadFocus offers ramp-up, constant-load, and stress test patterns that map directly to Loader.io's three test types. The terminology differs but the underlying load shapes are equivalent.
How does LoadFocus concurrency compare with Loader.io?
Loader.io tops out at 100,000 concurrent clients on Pro, which is more than LoadFocus plans offer: up to 12,500 virtual users on Pro and 20,000 on Enterprise. The difference is what those users do. Loader.io clients request a fixed list of URLs from one region; LoadFocus virtual users run JMeter or k6 scripts with logins, extracted tokens and think time, which is closer to real traffic per user.
Why is multi-region testing important?
Loader.io's single US-East region tests how your origin or CDN behaves for users in that geography. Real users hit your site from many locations, with different latency, packet loss, and CDN edge behavior. Multi-region testing surfaces problems Loader.io literally cannot see.
How does pricing compare?
Both products have free tiers. Paid LoadFocus starts at $29/month ($19/month billed yearly), and the Basic tier at $119/month ($79/month billed yearly) includes 1,500 concurrent users, a choice of 25+ test regions, JMeter/k6 scripting, and page speed + API monitoring on the same account. Loader.io Pro costs $99.95/month and stays single-region without scripting.
Try LoadFocus free
If you're using Loader.io today and finding its single-region, no-scripting model limiting, LoadFocus runs the same kinds of tests at a different scale. Sign up for a free tier, no credit card, and migrate your first Loader.io test in five minutes. Start your free trial.
