Blackfire Front-end Observability
Know how fast your app feels to real users
Blackfire's front-end observability tracks how users experience your site in the wild.
No cookies. No banners. Just performance truth.
- Track Web Vitals like LCP, CLS, INP, and more
- See where users struggle, by country, device, browser.
- Stay fully GDPR-compliant by default. We do not track individual users, set cookies, nor store personally identifiable information (PII)
You optimized the backend...
...but your users still complain.
The slow server isn't always the problem. Sometimes it's layout shifts.
Or a delayed font. Or an unreliable CDN hosted overseas.
Backend observability alone won't tell you what your users are actually feeling. That's where front-end metrics and analytics come in.
Real performance metrics, not lab simulations
Blackfire captures real-world data from users' browsers, across devices, geographies and networks.
- Largest Contentful Paint (LCP)
- Cumulative Layout Shift (CLS)
- Interaction to Next Paint (INP)
- First Contentful Paint (FCP)
- Time to First Byte (TTFB)
Understand how frontend and backend interact
Slow page load? High LCP? One click links you directly to the backend transaction, so you can fix it fast.
Geographic insights
Visualize where users experience the worst slowness, by region, device, or browser.
No cookies. No banners. No creepy tracking.
Blackfire respects user privacy. Period.
You're here for performance. Not popups.
Just fast apps. Happier users. And no legal drama.
- No personal data stored
- No consent banner required
- Fully GDPR-compliant by design
These organizations effectively leverage Blackfire capabilities to monitor and optimize application performance:
You can't fix what users feel if you don't see it
Your backend's clean. Your servers are fast. But if your Largest Contentful Paint is 4 seconds. Users still bounce.
Without visibility into how your site loads on real browsers, you're guessing. And guesses don't fix layout shifts, third-party scripts, or geo-based slowness.
Stop chasing ghosts
Tired of bug reports that start with "It feels slow"?
Blackfire shows you real user performance metrics. No synthetic data, no guesswork.
- Spot slow pages instantly
- See what caused it: backend, browser, network
- Fix it fast — with proof
No more chasing logs. No more dead ends.
Unlock clarity across devices, browsers, and regions
Every user experience is different. Blackfire breaks it down:
- Web Vitals for every page and session
- Interactive maps of performance across countries and devices
- Instant links to backend traces when frontend suffers
Optimize what users actually experience, not what lab tools simulate.
Find out what's really slowing your users down.
Blackfire's front-end observability shows how users actually experience your site.
No cookies. No guesswork. Just browser-level truth.