LoginSign Up
← Back to all sparks
C

Calibre

ANALYTICS
Velocity5.0

Web performance monitoring with synthetic tests and real user monitoring

calibreapp.com ↗

Calibre is tying every performance number back to the deploy that caused it.

web-performancerumdeployment-attributioncore-web-vitalsenterprise-security
◆Current state
The August release brings deployments into Real User Monitoring: deploy markers run along the bottom of charts, hovering one reveals the commit, author, and time, and clicking through opens the commit in source control, with each deployment compared against the previous. The same day, Synthetic metrics moved from one page at a time to median aggregates across all pages, segmented by test profile, deployment, and page — so a regression can be identified as site-wide or isolated. Before that: automatic measurement of soft navigations in single-page apps, a site-scan crawler that discovers and maintains the monitored page list on its own, self-service SAML SSO with SCIM on the Team plan, and an organisation-wide audit log that exports as NDJSON or streams to a SIEM over signed webhooks.
◆Where it's heading
Calibre is closing the loop between a metric moving and someone knowing why. Deployment attribution supplies the cause, the all-pages segmentation supplies the scope, and soft-navigation measurement fills the blind spot that made SPA numbers untrustworthy in the first place. Running alongside that is a distinctly enterprise track — SSO, SCIM, and an audit log with SIEM streaming are procurement requirements, and putting SAML on the Team plan rather than reserving it for Company is a deliberate move down-market with them.
◆Prediction
Expect deployment attribution to grow into alerting — a regression tied to a specific commit is the natural trigger for a notification, and the pieces are now all in place. How far the site-scan crawler is meant to replace manual page management is not yet clear from these entries.

◆Recent moves

  1. 8d ago

    Synthetic Metrics: All pages, segmented by Test Profile and Deployment

    Synthetic Pulse and metrics show median aggregates across all pages instead of one page at a time, with segmented views by test profile, deployment, and page. The by-page segment is the useful one — it answers whether a regression is site-wide or confined to a single route.

    View source ↗
  2. 8d ago

    See the performance impact of every website deployment

    Deployment markers appear along RUM charts carrying commit, author, and timestamp, with links into source control and each deploy compared to the one before. It turns a real-user metric chart into something an engineer can act on without cross-referencing a release log by hand.

    View source ↗
  3. 1mo ago

    Monitor Single Page App performance with soft navigations

    Calibre RUM measures soft navigations in single-page apps automatically, with no configuration, using browser soft-navigation attribution. It closes a genuine measurement gap — everything after an SPA's first load was effectively invisible to Core Web Vitals — though coverage is limited to recent Chrome and Edge for now.

    View source ↗
  4. 1mo ago

    Synthetic site scan, a new way to import and monitor your site

    A site-scan crawler continuously discovers which pages matter using internal link structure and navigation placement, adding new pages and dropping old ones without manual list maintenance. It removes the configuration chore that quietly makes synthetic monitoring go stale.

    View source ↗
  5. 1mo ago

    Self-service SAML Single Sign-On, now available on the Team plan

    SAML SSO becomes fully self-service and reaches the Team plan alongside Company, configured from a new Authentication panel with DNS TXT domain verification, a connection test before enforcement, and optional SCIM provisioning. Moving SSO down a tier is a pricing decision as much as a feature one.

    View source ↗
  6. 2mo ago

    Audit log: a complete record of security and admin activity

    An organisation-wide audit log records sign-ins, member and role changes, credential and API key activity, billing and SSO changes, with person, action, target, country, and device, filterable and exportable as NDJSON or streamable to a SIEM over signed webhooks. Compliance infrastructure, and a precondition for the SSO work that follows.

    View source ↗