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fastmon RUM review

#22 of 27 in Real User Monitoring

RUM, web analytics and synthetic checks in a focused web monitoring service.

7.1/10Editor score
Visit fastmon RUM
fastmon RUM7.1 Visit fastmon RUM

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

fastmon RUM monitors website performance from real visitors’ browsers. It combines Core Web Vitals for LCP, INP and CLS with JavaScript error tracking, network timing, page-load diagnostics and web analytics. Website teams, developers and small businesses can use geographic, device and network segmentation to examine performance differences across audiences. The service is hosted in Germany and connects through a single deferred JavaScript snippet, with REST API access for teams that need programmatic data.

Pricing is structured around monthly pageview-based plans. Light costs €29 per month and includes 200,000 pageviews, Core Web Vitals monitoring, real-user monitoring, web analytics, alerts through email, Slack, Discord and webhooks, plus one production and one development application. Standard costs €99 per month and adds JavaScript error grouping, network waterfalls, Server-Timing, Synthetic Monitoring, fastmon AI, at least 60-day full retention and 13-month statistics. Enterprise provides custom pageview volume and retention windows, priority support with a named contact, guided onboarding, a signed DPA and a security review. A 30-day free trial is available, and prices exclude VAT.

The standout value is the combination of field data and scheduled checks in one focused service. Teams can track regressions with threshold alerts, annotate deployments through CI/CD release markers, and schedule Lighthouse and TTFB synthetic checks. Integrations include GitHub Actions, GitLab and Vercel, while Slack, Discord and webhooks support notification workflows. fastmon RUM suits web teams that want performance diagnostics, analytics and synthetic coverage without expanding into a wider application-observability platform. Teams monitoring native mobile apps or broader infrastructure should choose a product designed for those environments instead.

fastmon RUM pros and cons

  • Where it wins
    • Tracks Core Web Vitals, errors, waterfalls and Server-Timing
    • Adds synthetic Lighthouse and TTFB checks alongside RUM
    • Supports segmentation, release markers, alerts and REST API access
  • Where it doesn't
    • Covers web and API platforms rather than broader application stacks
    • No free plan; Light starts at €29 per month
    • Enterprise features require a custom plan

fastmon RUM fact sheet, pricing and score →

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