Features

Five areas.One view.

One script, the same beacons, no extra tags. Here is every area in detail, with the numbers straight from the docs.

Real User Monitoring

The numbers from real visits.

Every real page load reports the metrics Google ranks you by, measured on your visitors' own devices and networks and evaluated at the p75. Everything condenses into one Experience Score: 0 to 10, graded A+ to F, from seven weighted signals (LCP 25%, INP, FCP and error rate 15% each, page load, CLS and TTFB 10% each).

The lab, right next to the field.

On top of the field data from your real visitors, fastmon runs scheduled lab tests. Two test types, controlled and reproducible.

Lighthouse · every 24 h

Full Lighthouse audit

Full run every 24 hours, desktop and mobile in one pass
Performance, Accessibility, Best Practices and SEO
Simulated device, ideal conditions, fully reproducible

TTFB · every 5 min

Lightweight server check

Server-response check about every 5 minutes
Split into DNS, TCP, SSL, server and transfer
Cache bypass on by default

Analytics, without the second tool.

Visitors, sources and campaigns sit right next to the load times that decide whether they convert. One less tool in your stack.

Ask your data.In plain language.

'Ask about this test' turns a Lighthouse test into a plain-language summary and drills into a single error, so you skip the query building. It stays on your own fastmon data. New, and evolving with every release.

Ask in plain languageDrill into errorsNo query building

Designed inside the GDPR. Not retrofitted to it.

That is the difference between a monitoring tool from the EU and one with an EU region. Here is the data sheet: the honest version, footnote included.

* Refers to the consent requirement under § 25 TDDDG, which presupposes access to the end user's device. A separate consent requirement under the GDPR may apply as soon as personally identifiable data is processed in a specific deployment. Assessing this is the responsibility of the respective website operator embedding fastmon.

Data sheet

Cookies: 0*strictly storage-free: no localStorage, no sessionStorage
IP address: removed at the edgebefore any application code ever sees it
Location: country onlytwo-letter ISO code, nothing more
Data path: 100% EUno Cloudflare, no AWS, no GCP
Retention: 90 daysdefault, configurable per website
Fingerprinting: noneno canvas, no font enumeration

Everything else that ships with it

The plumbing that makes the five areas usable day to day. All on the same script, all in the same dashboard.

One line, live in ~5 minutes

A single script tag with defer, no build step. First visitors show up in the dashboard about a minute after deploy.

Release tracking from CI/CD

Tag releases with one API call from GitHub Actions, GitLab or Vercel. Markers land on every chart, and you compare the hours before and after.

Alerts that route themselves

Threshold or percentage-change rules on Web Vitals, error rate, pageviews and more, sent to email, Slack, Discord or a webhook.

Server-Timing breakdown

Split server time into edge, origin, backend, database, render, cache and external phases, each at p50, p75 and p95.

Cache monitoring, three layers

Browser, CDN and origin cache status side by side, plus the bfcache hit rate and resources by type.

Explorer

Ad-hoc analysis from p50 to p99, filter and group your metrics without writing SQL.

API & Docs

Your data, one API call away.

Everything in the dashboard is a REST endpoint. Query any metric, wire fastmon into your own tools, or tag a release from CI/CD. Auto-generated OpenAPI schema, Bearer-token auth, offset and cursor pagination.

Analytics query API for every metric, aggregation and breakdown
Bearer-token auth (fm_...), scoped to owner or member
OpenAPI schema at /v1/openapi.json
Dedicated endpoints for errors, visitors, Server-Timing, releases and more

Read the API reference

api.fastmon.euExample

POST /v1/organizations/{org}/analytics/query
Authorization: Bearer fm_...

{
  "metrics": ["lcp", "inp", "cls"],
  "aggregations": ["p75"]
}

200 OK
{
  "data": [{ "lcp": { "p75": 1240 }, "inp": { "p75": 45 } }],
  "meta": { "total": 1, "has_more": false }
}