PageSpeed.ONE for Developers
Spot regressions before they're reported from production.
Synthetic tests and CrUX data in PageSpeed.ONE with technical details.
Try our monitoring app free for a month.
5,400 CZK annually per website. Invoice only, no credit card needed.
Contextual alerts. What worsened and since when?
The Monitor alerts you to significant metric and score changes. Less “something's slow,“ more actionable insights for git bisect and profiling.
“The tool works great for us. We check it every day because of INP. We have Watchdog notifications set up in Slack, and it just recently alerted us to a bug.”
Jaroslav HanslíkCTO, Slevomat
Less Manual Tuning, More Data for Prioritization
Recommendations ranked by impact. Directly into your backlog. Less debate on priorities, more clear fixes.
“We appreciate the daily data checks and email notifications in PageSpeed.ONE PLUS. Marking changes in the tool and tracking their impact has proven effective for us.”
Eda BenešProject Manager, PragueBest
Maintenance-Free Tool
No installation needed. Set URLs and domains once, and it runs automatically. Alerts are sent without any maintenance, unlike other tools.
Why Developers Choose PageSpeed.ONE
One score to rule speed
Speed Score (SPS, 0–100) distills speed into a single number for developers and clients. Trends reveal if post-release performance improves or declines, signaling when to dive deeper.
Technical
Depth
Waterfall, requests, third parties. Space for debugging and prioritization. Not just colorful bubbles without detail. Overview in the “Technical” report.
Annotations
for Measurements
Mark releases, experiments, or incidents to keep your graphs readable over time. Learn how in the notes guide.
Manual Test
After Deployment
Run measurements right after deployment. Verify in real-time, not later amidst random noise. Details in the “History” Report.
CrUX
+ Synthetic
Real-world and controlled environments both matter. Easily identify if an issue affects users or just the lab. Context in synthetics, CrUX, and RUM.
Monitor
without spam.
Adjustable thresholds and channels. Receive alerts for significant regressions, not every minor metric fluctuation. Settings in Watchdog documentation.
Frequently Asked Questions
Will we be flooded with notifications?
The Speed Monitor has adjustable thresholds, alerting you only when changes occur. Customize frequency and channels—email, Slack, or Microsoft Teams—to suit your needs. Default limits are based on years of real-world experience, but you can modify them anytime.
Find details in the notifications help and Watchdog report description.
How does it fit into our stack (Sentry and other tools)?
Typically, it's not a replacement for Sentry, Grafana, or APM. These tools monitor errors and the backend. PageSpeed.ONE adds an external speed perspective: user metrics, synthetic tests, and post-release change monitoring.
Find out how monitoring differs from tools like Sentry in the developer agency guide.
Do you have documentation where I can learn more?
Yes. Our detailed documentation and help provide clear explanations on website speed. The monitoring article covers related aspects and specific product changes.
From the help section, navigate to specific reports and screens, such as Domains for test run details including trace, or Navigation Types. We add metric methodology to Core Web Vitals.
Happier Users. Higher Conversions. Stronger SEO
Website speed matters. We know this from a number of case studies.
100 ms
A tenth of a second. People consider this kind of response to be instantaneous. Is your website responsive like that?+24% of users
Websites that meet Web Vitals metrics are one-quarter less likely to bounce.+10% views
The BBC measured on its websites that for every second of acceleration, they gain a tenth of an extra view.+8.4% conversions
Deloitte Digital found that a mere 100 ms speed increase boosted conversions for 37 brands' websites.Interested in technical details? Chat with our technician.
5,400 CZK annually per website: 5 URLs and 5 domains. More for an additional fee. One month free, no card required.
You'll see the public trial project immediately. Want to go through the setup together? Let's schedule a demo.