Countly
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Comparison · Analytics
Calibre vs Cortex
A side-by-side editorial comparison of Calibre and Cortex — release velocity, themes, recent moves, and the top alternatives to consider.
Calibre vs Cortex: at a glance
What is Calibre?
Lighthouse 13.6 shifts Calibre's scores and adds audits for how AI agents read your pages
Calibre's Test Agents moved to Chrome 156 and Lighthouse 13.6.0, which fixes how simulated throttling calculates LCP and FCP, so scores on PageSpeed Desktop and PageSpeed Mobile Test Profiles should mostly improve with no site change. Snapshots also gained Lighthouse's Agentic Browsing audits, covering the accessibility tree, WebMCP, llms.txt and ARD manifests, a category Google marks as under development. In September the free Core Web Vitals Test added four experimental CrUX ad metrics. August's work attached deployment markers to RUM charts and added all-pages Synthetic aggregates.
What is Cortex?
Cortex 1.22 is on its fourth candidate, with sharded Parquet and years of deprecated flags removed.
Cortex 1.22.0 has been in release candidates since 12 September, reaching rc.3 on 6 October, and GitHub shows no final yet. The candidate adds sharded Parquet conversion and querying, resource-based query eviction that cancels the heaviest query when CPU or heap crosses a threshold, OCI Object Storage as a backend, and an active-series tracker per tenant. It also removes long-deprecated flags and config fields, some of which now stop Cortex from starting if left in place.
Calibre vs Cortex: editorial side-by-side
Calibre
2.5ANALYTICS
Lighthouse 13.6 shifts Calibre's scores and adds audits for how AI agents read your pages
◆ Current state
Calibre's Test Agents moved to Chrome 156 and Lighthouse 13.6.0, which fixes how simulated throttling calculates LCP and FCP, so scores on PageSpeed Desktop and PageSpeed Mobile Test Profiles should mostly improve with no site change. Snapshots also gained Lighthouse's Agentic Browsing audits, covering the accessibility tree, WebMCP, llms.txt and ARD manifests, a category Google marks as under development. In September the free Core Web Vitals Test added four experimental CrUX ad metrics. August's work attached deployment markers to RUM charts and added all-pages Synthetic aggregates.
◆ Where it's heading
Calibre remains focused on explaining why a metric moved, and this release shows the hard case: the number can move because the test changed. Tracking new browser and Lighthouse data quickly is part of the product, as the same-day CrUX ad metrics showed. Agentic Browsing audits add a new question to a performance tool, whether agents can use a page, which is still early.
◆ Prediction
Expect deployment attribution to grow into alerting, since a regression tied to a commit is the natural trigger. Agentic Browsing audits should keep changing with Lighthouse, so Calibre's treatment of them depends on Google's direction.
Cortex
2.5ANALYTICS
Cortex 1.22 is on its fourth candidate, with sharded Parquet and years of deprecated flags removed.
◆ Current state
Cortex 1.22.0 has been in release candidates since 12 September, reaching rc.3 on 6 October, and GitHub shows no final yet. The candidate adds sharded Parquet conversion and querying, resource-based query eviction that cancels the heaviest query when CPU or heap crosses a threshold, OCI Object Storage as a backend, and an active-series tracker per tenant. It also removes long-deprecated flags and config fields, some of which now stop Cortex from starting if left in place.
◆ Where it's heading
The storage arc toward Parquet continues: after 1.21 made Parquet a Store Gateway query mode, 1.22 shards files that exceed column limits. A second arc is protecting shared clusters from heavy tenants, through query eviction, resource-based throttling and concurrent data-byte limits on store gateways. The cleanup is the maturity arc from 1.21 carried further: no-op flags that were tolerated for releases now fail at startup.
◆ Prediction
1.22.0 final should follow rc.3, which added only two fixes. Operators should expect upgrade failures from leftover deprecated flags, and the release notes tell them to grep runtime configs before upgrading.
Alternatives to Calibre and Cortex
Other Analytics products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Calibre or Cortex.
OpenMetadata
OpenMetadata reaches 2.1 rc1 after a month of repairing 2.0's connectors.
Stitch
Stitch keeps patching connectors one replication bug at a time.
Datawrapper
Datawrapper's October is touch tooltips, keyboard focus and small chart repairs.
Fluent Bit
Fluent Bit spends October bounding what its inputs will accept.
Axiom
Axiom makes agent work checkable, and points alerts straight at coding agents
See all Calibre alternatives → · See all Cortex alternatives →
Recent activity from Calibre and Cortex
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 2d agoCalibreChrome 156 & Lighthouse 13.6.0
- 26d agoCortex1.22 candidate 4 fixes tenant-deletion cleanup on GCS and Azure
- 1mo agoCortex1.22 candidate 3 fixes the ingestion-delay histogram
- 1mo agoCortex1.22 candidate 2 adds three bug fixes
- 1mo agoCalibreCore Web Vitals Test, now with ad metrics
- 1mo agoCortex1.22 candidate: sharded Parquet, query eviction, OCI storage
- 2mo agoCalibreSee the performance impact of every website deployment
- 2mo agoCalibreSynthetic Metrics: All pages, segmented by Test Profile and Deployment
- 3mo agoCalibreMonitor Single Page App performance with soft navigations
- 3mo agoCalibreSynthetic site scan, a new way to import and monitor your site
- 5mo agoCortex1.21.1 candidate hardens gossip, ingestion and status pages
- 6mo agoCortex1.21.0-rc.1 fixes memberlist, tenant federation and a memory leak
Frequently asked questions
What is the difference between Calibre and Cortex?
They serve adjacent needs but don't currently overlap on shipped themes. Calibre and Cortex are shipping at a similar cadence (velocity 2.5 vs 2.5, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Calibre better than Cortex?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Calibre and Cortex are shipping at a similar cadence (velocity 2.5 vs 2.5, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other Analytics products to evaluate alongside.
What are the best alternatives to Calibre?
Top Calibre alternatives in Analytics are ranked by recent ship velocity. Browse the "Calibre alternatives" section above for the current picks, or visit /alternatives/calibreapp for the full list with editorial commentary on each.
What are the best alternatives to Cortex?
Top Cortex alternatives in Analytics are ranked by recent ship velocity. Browse the "Cortex alternatives" section above for the current picks, or visit /alternatives/cortex-metrics for the full list with editorial commentary on each.