What is WebPageTest?
WebPageTest is an open-source web performance testing tool, originally built by Patrick Meenan and now maintained by Catchpoint, which has been part of LogicMonitor since December 2025. It runs on-demand single-page synthetic tests from many global locations, capturing detailed waterfall data, Core Web Vitals, screenshots, and visual progress. WebPageTest's free public instance (webpagetest.org) is hugely popular for ad-hoc page-speed audits.
WebPageTest also offers a paid SaaS variant (WebPageTest Pro / API by Catchpoint) for teams that need higher rate limits, scheduled monitoring, and team features. The OSS version can be self-hosted for compliance-sensitive use cases.
When WebPageTest is the right tool
- Detailed ad-hoc page-speed audits. The waterfall and filmstrip views are unmatched for diagnosing single-page performance issues.
- Real Chromium testing from many global locations. Over 40 public test locations available.
- Filmstrip + visual progress analysis. Frame-by-frame visual comparison of page load.
- Free Starter plan. 150 test runs a month with a free account.
- Self-hosting for compliance. The OSS code can run inside your own VPC.
Where WebPageTest stops being enough
- No load testing. WebPageTest measures one user at a time. Concurrent traffic simulation is not its model.
- No scheduled monitoring on the free plan. The free Starter plan gives 150 test runs a month with 60-day retention, but no scheduled tests or alerts. Those start on Professional, from $180/year. Prices from the WebPageTest pricing page (now on logicmonitor.com), checked October 2026.
- No API monitoring. Backend HTTP/REST monitoring is not part of WebPageTest.
- Self-hosting has operational cost. Running your own WebPageTest instance requires Docker/VM management.
WebPageTest vs Lighthouse
The two are often compared, but they answer different questions:
- Lighthouse loads a page in Chrome, applies simulated throttling, and gives you a 0-100 score with a list of fixes, ordered by how much time each would save. It is built into Chrome DevTools and PageSpeed Insights.
- WebPageTest loads the page in a real browser on a test agent, shapes the network connection for real, and records everything: a request waterfall with DNS, connect and SSL time, a frame-by-frame filmstrip, and scripted multi-step tests. It can also run Lighthouse as part of a test.
In short, Lighthouse tells you what to fix, and WebPageTest shows you exactly what happened during one load. LoadFocus page speed monitoring runs Lighthouse on a schedule from 25 regions and alerts you when a score or Core Web Vital crosses a budget; for a single check there is the free website speed test.
LoadFocus vs WebPageTest: feature comparison
| Feature | LoadFocus | WebPageTest |
|---|---|---|
| Cost | Free tier; from $39/mo ($29/mo billed yearly) | Free Starter plan (150 runs a month); Professional from $180/year |
| Page speed monitoring (continuous) | Yes | Yes, on Professional and above |
| Single-page audits | Yes | Yes (specialty) |
| Filmstrip + visual progress | Lighthouse filmstrip screenshots | Yes (specialty) |
| Detailed waterfall | No waterfall chart; Lighthouse network requests table | Yes (specialty) |
| Load testing | Yes (up to 20,000 VUs on Enterprise) | No |
| API monitoring | Yes | No |
| JMeter (.jmx) script support | Yes (native) | No |
| k6 (.js) script support | Yes (native) | No |
| Test locations | 25+ globally | 40+ globally |
| Real Chromium browser | Yes | Yes |
| Core Web Vitals tracking | Yes | Yes |
| CI/CD integration | Load tests: CLI, GitHub Action, Jenkins plugins | API and a GitHub Action with budgets and PR comments |
| Combined platform (load + speed + API) | Yes | Page speed only |
When LoadFocus is the right upgrade from WebPageTest
You need continuous monitoring with regression alerts
WebPageTest's public instance is for ad-hoc audits. LoadFocus's page speed monitoring runs scheduled tests with CWV budgets and alerts on regressions.
You need load testing alongside page speed
WebPageTest measures one user. LoadFocus load testing simulates thousands of concurrent users from cloud regions, with JMeter or k6 scripts or a list of URLs.
You need API monitoring
WebPageTest is page-only. LoadFocus API monitoring checks HTTP/REST endpoints on a schedule with assertions, and has a free plan of 10 checks.
You want consolidated load + page speed + API monitoring
LoadFocus combines all three on one platform.
You don't want to self-host
If running your own WebPageTest instance is operationally too much, LoadFocus is managed cloud SaaS with no infrastructure to operate.
Coexistence with WebPageTest
For most teams, LoadFocus and WebPageTest don't compete, they complement. WebPageTest is the gold standard for ad-hoc detailed page-speed diagnostics; LoadFocus is purpose-built for continuous monitoring + load testing + API monitoring. The two coexist on most performance-engineering stacks.
FAQ: LoadFocus vs WebPageTest
Can LoadFocus replicate WebPageTest's filmstrip view?
Limited. WebPageTest's filmstrip + visual progress are specialty features. LoadFocus shows render timing and screenshots but isn't a frame-by-frame comparison tool.
How does pricing compare?
WebPageTest's Starter plan is free with 150 test runs a month; scheduled tests start on Professional, from $180/year (WebPageTest pricing page, October 2026). LoadFocus page speed monitoring starts at $39/month ($29/month billed yearly) for 300 tests a month, and the same account covers load testing and API monitoring.
Can I use both tools?
Yes, and most teams should. WebPageTest for deep ad-hoc audits, LoadFocus for continuous monitoring + load + API.
Should I self-host WebPageTest or use LoadFocus?
Self-hosting WebPageTest gives you full control but requires operational work. LoadFocus is managed cloud, pick based on whether you need data-residency control or operational simplicity.
Are LoadFocus scores comparable to WebPageTest?
Not exactly. WebPageTest measures on its own agents with real network shaping, while LoadFocus runs Lighthouse with mobile or desktop throttling, so lab numbers for the same page will differ. Compare trends within one tool rather than numbers across the two.
Try LoadFocus free
If you're using WebPageTest for ad-hoc audits and need continuous monitoring or load testing, LoadFocus covers those adjacent categories. Sign up for a free tier at loadfocus.com/signup, no credit card.
