fastmon vs Datadog RUM
Real User Monitoring,without the enterprise bill.
Datadog RUM is part of a full observability suite, priced and built for enterprises. fastmon is focused web-performance RUM: lighter, EU-hosted, and a fraction of the cost.
Datadog is a serious full-stack observability platform: APM, logs, infrastructure and RUM. If you need all of that in one place, it does far more than fastmon, and we will not pretend otherwise.
But for web performance specifically, Datadog RUM is heavy, uses cookies, comes from a US company under the CLOUD Act, and gets expensive fast at real traffic. fastmon does the web-performance job: Core Web Vitals, errors and network timing from real users, cookieless* by default, hosted in Germany, from €29 a month.
Focused web RUM
At a fraction of the cost.
For web performance specifically, the differences are stark.
| fastmon | Datadog RUM | |
|---|---|---|
| Core Web Vitals from real users | ||
| JavaScript errors and network timing | ||
| Alerts and release tracking | ||
| Cookieless* in the default mode | ||
| Hosted in the EU, no US jurisdiction | ||
| Lightweight script | ~40 KB | ~60 KB gzipped |
| Setup | One script tag | SDK and config |
| Session replay | No, by design | |
| Full-stack observability (APM, logs, infra) | ||
| Raw data retention | 90 days (default), up to 13 months (Enterprise) | events 15 to 30 days (metrics longer) |
| Price at about 1M sessionsDatadog bills per session, fastmon per pageview; 1M sessions are typically 2 to 4M pageviews | ≈ €169 to €200/mo (at ~3M pageviews) | from ~$150/mo (RUM Measure, annual); Investigate $3 per 1k sessions |
Datadog restructured RUM pricing in 2026: RUM Measure from $0.15 per 1k sessions (annual), RUM Investigate $3 per 1k filtered sessions, Session Replay extra. Prices vary by contract. Datadog does far more than web RUM. As of 14 July 2026: list prices / typical configuration; individual terms may differ.
Why teams pick fastmon for web RUM
Lighter, EU-hosted, affordable.
When web performance is what you actually need to watch.
A fraction of the cost
From €29 a month. Datadog has per-session, modular list pricing; debugging-grade features sit in the higher-priced Investigate tier.
EU-hosted and cookieless*
In Germany, no US provider in the data path, no cookies* in the default mode. Datadog is a US company under the CLOUD Act, even in its EU region.
Live in five minutes
One script tag, around 40 KB, no agent and no build step. Focused on web performance, nothing to configure.
Fair play
Where Datadog is the right call.
If you need APM, log management, infrastructure monitoring and RUM in one platform, Datadog is built for exactly that and does far more than fastmon. fastmon is the focused, EU-hosted, affordable choice when web performance is the thing you need to watch.
FAQ
fastmon and Datadog.
The questions people ask before they switch.
Is fastmon a Datadog replacement?
For web-performance RUM, yes, and at a fraction of the price. For full observability, meaning APM, logs and infrastructure, no: Datadog is a much broader platform. fastmon deliberately does one thing well.
How much cheaper is fastmon?
fastmon starts at €29 a month. Datadog has per-session, modular list pricing; debugging-grade features sit in the higher-priced Investigate tier, and costs depend on contract and modules. For web performance specifically, fastmon covers the essentials for far less.
Honestly compared,
built in the EU.
The web-performance job without a US cloud: read-only by default, no cookies*, no long-lived identifiers, from €29 a month.
Light
€29/month
200,000 pageviews included.
Need debugging and all features? Standard from €99 for 1M pageviews. Enterprise on request. See all plans