Zappline pings your websites and APIs every few seconds from 23 cities and tells you the instant your response time slows or drops. Not just up or down. How fast.
No credit card · 2-minute setup · cancel in one click
Keeping the line fast for
Every check records DNS, TLS, time-to-first-byte and full load. Watch p50, p95 and p99 trend, not a binary up/down light.
Set a threshold in milliseconds. When the line slows past it for N consecutive checks, you get paged, before users feel it.
Monitor JSON endpoints, assert on status, headers and body, and chain multi-step flows like login → cart → checkout.
Certificates and domains expire at the worst moment. Zappline warns you weeks ahead so the line never goes dark.
A live oscilloscope per monitor, region heatmaps and a 1-year history you can scrub through to find the exact regression.
Publish a branded status page and export SLA-grade uptime and latency reports your customers and auditors will trust.
Paste a website, an API endpoint or a full transaction. No agent, no SDK, nothing to install. The first check runs in seconds.
Probes around the world hit your line on your interval, as tight as every 5 seconds, recording full timing from each region.
Slowdowns and outages are confirmed across cities, then routed to Slack, PagerDuty or SMS, with the region and the numbers attached.
A site that feels instant in Frankfurt can crawl in São Paulo. Zappline checks from 23 cities on 6 continents, so you see the slow path before the customer on it does, and you know exactly which region to fix.
Zappline confirms a slowdown from multiple cities before it wakes anyone, so a single flaky probe never becomes a 3am page. Set thresholds on latency, not just downtime.
Spin up a branded status page on your own domain in a click. Live latency, 90-day history and incident notes, all published automatically from the same checks that page your team.
“Pingdom told us we were up. Zappline told us checkout had gotten three times slowerin Asia. We fixed it before a single ticket came in.”
Start free, forever. Upgrade when you have more lines to keep fast.
For a side project or a single product.
For startups that page when the line slows.
For platforms with an SLA to defend.
Paste a URL and watch the first check land in seconds. No card, no call.