Best Core Web Vitals monitoring tools in 2026
Daily lab tests, no card.
Core Web Vitals come from two sources: lab tests you schedule and field data from real Chrome users (CrUX). Monitoring tools mix the two in different ways, and that drives most of the price difference. Figures were read on 16 Oct 2026 from each vendor's pricing page, in US dollars.
Price comparison
| Tool | Free option | Entry paid plan | Measures |
|---|---|---|---|
| Vitals Clock (ours) | 3 URLs, daily lab tests | $19/mo for 25 URLs | Lab tests plus CrUX field data |
| Treo | 50 CrUX pages on 5 sites | Vital, $75/mo; Pro $185/mo | Field data first, lab on paid plans |
| Calibre | 15-day trial | Starter $75/mo | Synthetic tests, RUM, CrUX |
| SpeedCurve | Trial | From $90/mo | RUM page views plus synthetic checks |
| DebugBear | Check its site | Not quoted; page did not render reliably | Lab, CrUX and RUM |
Who each one suits
Calibre gives unlimited sites and URLs with real user session monitoring. A good fit for a product team that wants depth across one large site.
SpeedCurve is built around real user monitoring and long-term performance budgets. Best for sites with enough traffic to make RUM data meaningful.
Treo has a generous free plan for field data. If you mainly want to watch CrUX trends, start there.
DebugBear offers detailed lab reports and request waterfalls. Check its current plans directly.
Vitals Clock runs daily lab tests on the URLs you pick and shows CrUX data next to them, with alerts when a score drops. It suits agencies and small teams watching a list of key pages.
How to choose
Decide whether you need real user data from your own visitors or whether CrUX and scheduled lab tests are enough. RUM tools cost more because they process every page view.