fastmon RUM is a web and API service for measuring store load time and website performance from real customers’ devices and networks. Its real-user reports include Core Web Vitals and related measures evaluated at the p75, together with visitors, traffic sources, campaigns, UTM attribution, geographic breakdown and error correlation. A beta Synthetic Monitoring feature runs Lighthouse audits every 24 hours and checks time to first byte about every five minutes. Alerts can use thresholds or percentage changes and be delivered by email, Slack, Discord or webhook. The REST API covers analytics queries plus errors, visitors, Server-Timing and releases, using Bearer-token authentication and an OpenAPI schema. Integrations are named for Shopware and Shopify, while a script can be added to WordPress, Magento, TYPO3, Webflow, Next.js, React and other compatible sites. Minimal and Standard modes set no cookie, and the maker says IP and User-Agent data are removed at the edge. Plans start at €29/mo, with a 30-day trial and no free plan.
Who it is for
It suits shops and website teams that need real-user performance data, analytics attribution and alerting. Light is described for small shops, while Enterprise targets high-traffic teams with custom needs.
What is good
- Core Web Vitals reported at p75
- Alerts via email, Slack, Discord or webhook
- REST API with OpenAPI schema
- Shopware and Shopify integrations
- 30-day trial without a credit card
What to know first
- No free plan
- Synthetic Monitoring is still beta
- Light includes 200,000 pageviews
- Enterprise pricing is custom
Verdict
fastmon RUM combines real-user performance measurements with traffic analytics, alerting and API access. Its EU processing and stated privacy modes may suit organizations with specific data-handling requirements, while plan limits and the beta synthetic feature need consideration.
fastmon RUM plans and pricing
All plansCompared on real user monitoring
- Free plan
- No
- Core Web Vitals
- Yes
- Interaction tracking
- Yes
- Geographic breakdown
- Yes
- Error correlation
- Yes
- Data retention
- 90+ days
- Pricing metric
- pageviews
