Your users noticed your app was slow.
You didn't.
RPAlert monitors real user LCP, sends instant Discord & Slack Webhook alerts when performance degrades โ before your users complain.
โ ๏ธ LCP Alert โ my-shop.com
Try RPAlert โ No Signup Required
Enter your Discord or Slack Webhook URL to receive 3 demo alerts: detection, worsening, and recovery.
Stop finding out from your users.
Performance regressions happen. The question is whether you find out first.
Without RPAlert
- User sends angry tweet: "your site is broken lol"
- You check Twitter at 9am, panic
- LCP was 6.8s for 3 hours last night
- 15% bounce rate spike โ sales lost
Time to detection: ~9 hours (when a user reports it)
With RPAlert
- LCP spikes to 4.2s at 11:43 PM
- Discord alert fires in 60 seconds
- You fix the slow image before users notice
- Zero complaints. Business as usual.
Time to detection: <60 seconds (automated alert)
Up and running in 5 minutes.
Install the SDK
Add one package to your Next.js app. No config required โ it auto-detects your pages.
Set your LCP threshold
Define what 'slow' means for your app. Default: 2.5s โ Google's 'Good' threshold for LCP.
Get instant alerts
When real users experience slow pages, your team gets notified in Discord or Slack (via Incoming Webhook) with the exact LCP value and page URL.
Discord
โ ๏ธ LCP Alert โ 4.2s on /products/โฆ
Slack
โ ๏ธ LCP Alert โ 4.2s on /products/โฆ
Everything you need to stay fast.
Purpose-built for React developers who care about real user experience.
Real User Monitoring
Measure actual LCP from real browsers โ not synthetic tests. Know exactly what your users experience on every page.
Discord & Slack Webhook Alerts
Instant notifications to your team's chat via Discord or Slack Incoming Webhooks. No dashboards to check, no email to ignore.
Per-App Thresholds
Different apps have different SLAs. Set custom LCP thresholds per app and get alerted on your terms.
Trend History
See notification history and LCP trends over time. Spot patterns before they become critical problems.
60-Second Detection
From slow page load to team alert in under 60 seconds. Catch regressions as they happen, not hours later.
Zero Infrastructure
One SDK install. No agents, no servers, no DevOps required. Works with any Next.js or React app.
See your app's performance at a glance.
A clean dashboard for each of your apps. Every alert, every trend, in one place.
my-shop.com
Avg LCP (24h)
2.1s
Alerts today
2
P95 LCP
3.9s
LCP Alert
/products/winter-sale
LCP Alert
/checkout
Resolved
/
Simple, transparent pricing.
Start free. Scale as you grow.
Free
Get started with basic monitoring for a single app.
Free forever
- 1 app
- 10 alerts/mo
- 7-day retention
- 5-min alert interval
Pro
For growing teams. Monitor multiple apps and catch regressions before users do.
Billed monthly
- 10 apps
- 1,000 alerts/mo
- 30-day retention
- Real-time alerts
- Email support
Max
For large-scale operations. High-volume monitoring with extended data retention.
Billed monthly
- 100 apps
- 10,000 alerts/mo
- 90-day retention
- Real-time alerts
- Priority email support
- Early access to new features
No long-term contracts.
Start monitoring
in 5 minutes.
Free forever for 1 app. No credit card required. Set up once, get alerts forever.