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Open source real user monitoring and session replay tools in 2026

Measure performance and errors in real users' browsers and apps, and replay what they did. This list has 5 real user monitoring and session replay tools. Of these, 5 are open source, 5 have a free plan and 5 can be self-hosted. Checked by hand on 30 September 2026.

  1. 1

    Boomerang

    Open source JavaScript library, maintained by Akamai, that measures page load and user-perceived performance in real browsers and beacons the timings to a server you choose.

    Free Open source (BSD-3-Clause) Self-hosted Real user monitoring
  2. 2

    Grafana Faro

    Open source web SDK for frontend observability: captures page performance, Web Vitals, errors, logs and traces from browsers and sends them to Grafana Cloud or a self-run Alloy and Loki stack.

    Free plan Open source (Apache-2.0) Self-hosted Real user monitoringErrorsOpenTelemetry
  3. 3

    OpenReplay

    Open source session replay with developer tools attached: console logs, network requests and performance data alongside each recording, plus co-browsing. Self-host free or use a managed instance.

    Free plan Open source (AGPL-3.0) Self-hosted Session replayReal user monitoringErrors
  4. 4

    PostHog

    Open source product suite with session replay, product analytics, feature flags, error tracking and LLM analytics sharing one event store. Hosted with a monthly free allowance, or self-hosted.

    Free plan Free: 5K session recordings and 1M events per month Open source (MIT) Self-hosted Session replayReal user monitoringErrors
  5. 5

    rrweb

    Open source library that records DOM changes in the browser and replays them as a session video; the recording engine inside many session replay products.

    Free Open source (MIT) Self-hosted Session replay

Side by side

Tool Pricing Free plan Open source Self-hosted Core Web VitalsSession replayJavaScript errorsMobile SDKsResource timingSegmentationAlertsPrivacy maskingJourneys or funnels
Boomerang Free Yes Yes Yes YesNoYesNoNoNoNoYesNo
Grafana Faro Free plan Yes Yes Yes YesYesYesNoNoNoNoYesNo
OpenReplay Free plan Yes Yes Yes -YesYesYesYesYesYesYesYes
PostHog Free plan 5K session recordings and 1M events per month Yes Yes YesYesYesYesYesYesYesYesYes
rrweb Free Yes Yes Yes NoYesYesNoNoNoNoYesNo

Yes: confirmed in the tool's documentation. No: documented as not offered. -: not confirmed. Plans and prices change; check each tool's own site before you decide.

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