RUM vs Synthetic Monitoring Cost 2026
RUM and synthetic monitoring measure web performance from opposite ends. RUM is what real users experienced, captured passively in the browser. Synthetic is what scripted checks experienced, run actively on a schedule from controlled locations. Both have a place; only one is cheap to scale.
The two products are complementary, not substitutes
Synthetic monitoring runs a scripted browser session (or HTTP request) from a controlled location on a schedule. The script visits a URL, executes a transaction (login, search, add-to-cart, checkout), and reports timing + success/failure. Because the script is identical every run, results are comparable over time, synthetic is the right tool for “has anything regressed?” and for uptime monitoring.
RUM runs in the visitor's actual browser. It captures whatever the visitor did, from wherever they were, on whatever device and connection they had. RUM is the right tool for “what are users actually experiencing?” and for identifying issues that affect specific user segments (mobile vs desktop, country, browser, ISP).
The two products have complementary blind spots. Synthetic misses real-user issues that don't affect the script (a slow third-party script that loads only after login, a regression on a specific browser version your script doesn't use, a geographic issue your script doesn't test from). RUM misses uptime issues during periods of zero real traffic (3am Tuesday) and pre-launch regressions (no users to measure).
Cost structure compared
| Aspect | RUM | Synthetic |
|---|---|---|
| Pricing meter | Per session, per page view, or per GB ingest | Per check × frequency × location |
| Cost at 1M sessions | $100 to $4,500/month depending on vendor | $10 to $200/month (independent of user volume) |
| Scales with traffic | Yes, linearly | No, fixed per check schedule |
| Useful pre-launch | No, needs real users | Yes, runs on schedule regardless |
| Captures user-specific issues | Yes | No, only what the script tests |
| Detects uptime issues | Indirectly (gap in session ingest) | Directly (check returns failure) |
Vendors that sell both
Several vendors in our matrix bundle RUM and synthetic monitoring into a single platform:
- SpeedCurve — RUM + synthetic in single subscription, $90/month starter.
- Catchpoint — enterprise-tier RUM + synthetic, $10K/year floor.
- Datadog — RUM and synthetic monitoring as separate products on same platform, each priced separately.
- Dynatrace — RUM and synthetic as separate products in Dynatrace platform.
- Pingdom — historically bundled but current pricing unverified.
Budget split recommendation
For a typical commercial site:
- Start with synthetic only ($10-50/month). Pre-launch, low-traffic, or uptime-monitoring-only scenarios.
- Add RUM at 1K+ daily sessions ($0-50/month). Free tiers (Cloudflare, Sentry, Fullstory) cover early production usage.
- Scale RUM at 10K+ daily sessions ($50-500/month). Cheapest commercial RUM (Raygun, Sematext Experience) supports this band.
- Add full enterprise RUM at 1M+ monthly sessions ($500-5K/month). Datadog, Dynatrace, or platform-bundled options.
- Keep synthetic running throughout. Even with RUM, synthetic continues to catch uptime gaps and transactional regressions.
Where to go next
- For RUM pricing across 18 vendors, see the homepage matrix.
- For RUM by budget band, see small business, mid-market, or enterprise.
- For synthetic-only and bundled-with-RUM vendors specifically, see SpeedCurve and Catchpoint.