Tinylytics
Tinylytics adds account-wide IP ignores and monitoring-only sites
Comparison · Analytics
Calibre vs DebugBear
A side-by-side editorial comparison of Calibre and DebugBear — release velocity, themes, recent moves, and the top alternatives to consider.
Shared themes:web-performancerum
Calibre vs DebugBear: at a glance
What is Calibre?
Calibre MCP lets your coding agent read RUM and Lighthouse data, then fix the slow code
Calibre now ships a read-only MCP server that gives Claude Code, Cursor, Codex, Copilot, Claude and ChatGPT access to an account's RUM, CrUX and Synthetic data, included on every plan with nothing to install. It lands days after Test Agents moved to Chrome 156 and Lighthouse 13.6.0, which added audits for how AI agents read pages. Admins can disable MCP per organisation and revoke connections, and the Company-plan audit log records them.
What is DebugBear?
DebugBear is growing from performance testing into uptime, browser support and ad-impact data.
Seven monthly digests show a tool widening on several fronts. August added uptime monitoring, Server Timing in lab and RUM, and URL-based conversion triggers. September added a Browsers tab showing which Baseline web features visitors' browsers support, CrUX Ad Insights metrics, and more custom dashboard work. Earlier months brought a bottleneck finder, HAR exports, custom dashboards and an MCP server for Claude, ChatGPT and Cursor.
Calibre vs DebugBear: editorial side-by-side
Calibre
6.3ANALYTICS
Calibre MCP lets your coding agent read RUM and Lighthouse data, then fix the slow code
◆ Current state
Calibre now ships a read-only MCP server that gives Claude Code, Cursor, Codex, Copilot, Claude and ChatGPT access to an account's RUM, CrUX and Synthetic data, included on every plan with nothing to install. It lands days after Test Agents moved to Chrome 156 and Lighthouse 13.6.0, which added audits for how AI agents read pages. Admins can disable MCP per organisation and revoke connections, and the Company-plan audit log records them.
◆ Where it's heading
Calibre is turning its monitoring data into something agents act on rather than something people read in dashboards. The summer work on deployment markers, all-pages aggregates and the audit log built the context and governance an agent needs: which deploy, which page, who connected. Expect the remaining surface to follow the same path, with agents both querying performance and being measured by it.
◆ Prediction
The likely next step is write access or deploy-linked workflows over MCP, such as an agent opening a fix tied to a regression marker, since the current server is explicitly read-only and the launch frames fixing as the goal.
DebugBear
0.0ANALYTICS
DebugBear is growing from performance testing into uptime, browser support and ad-impact data.
◆ Current state
Seven monthly digests show a tool widening on several fronts. August added uptime monitoring, Server Timing in lab and RUM, and URL-based conversion triggers. September added a Browsers tab showing which Baseline web features visitors' browsers support, CrUX Ad Insights metrics, and more custom dashboard work. Earlier months brought a bottleneck finder, HAR exports, custom dashboards and an MCP server for Claude, ChatGPT and Cursor.
◆ Where it's heading
DebugBear is moving from 'is my page fast' to a wider view of who visits and what slows them down: availability, browser capabilities, and now the cost of ads. Custom dashboards are the surface that ties those data sets together, and they get work almost every month.
◆ Prediction
Expect October's digest to add more RUM breakdowns or dashboard widgets built on the new browser and ad data, following the monthly pattern.
Alternatives to Calibre and DebugBear
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 DebugBear.
OpenReplay
OpenReplay lets self-hosters block the hosts a recorded session can make its asset cacher fetch.
OpenHouse
OpenHouse records why table maintenance fails and adds timezone-aware retention.
OpenCTI
OpenCTI accepts Filigran licenses and closes a draft-access hole in its TAXII routes.
InfluxDB
InfluxDB keeps patching its 3.11 and 3.12 lines, now with a catalog repair tool.
Basedash
Basedash adds verified dashboards so teams know which numbers to trust.
See all Calibre alternatives → · See all DebugBear alternatives →
Recent activity from Calibre and DebugBear
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoCalibreCalibre MCP: connect your coding agent to your performance data ⚡
- 4d agoCalibreChrome 156 & Lighthouse 13.6.0
- 1mo agoDebugBearSeptember 2026: Browser insights and CrUX ad metrics
- 1mo agoCalibreCore Web Vitals Test, now with ad metrics
- 2mo agoDebugBearUptime monitoring and Server Timing support arrive ⚡
- 2mo agoCalibreSynthetic Metrics: All pages, segmented by Test Profile and Deployment
- 2mo agoCalibreSee the performance impact of every website deployment
- 3mo agoDebugBearBottleneck finder tool and better data export
- 3mo agoCalibreMonitor Single Page App performance with soft navigations
- 4mo agoDebugBearDebugBear ships an MCP server for Claude, ChatGPT, and Cursor ⚡
- 5mo agoDebugBearAgentic browsing audits and quick performance tests
- 6mo agoDebugBearCustom performance dashboards go live
Frequently asked questions
What is the difference between Calibre and DebugBear?
Both compete on the same themes — web-performance, rum — within Analytics. Calibre is currently shipping more aggressively (velocity 6.3 vs 0.0), with 1 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Calibre better than DebugBear?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Calibre is currently shipping more aggressively (velocity 6.3 vs 0.0), with 1 editorial sparks in the last 30 days against 0. 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 DebugBear?
Top DebugBear alternatives in Analytics are ranked by recent ship velocity. Browse the "DebugBear alternatives" section above for the current picks, or visit /alternatives/debugbear for the full list with editorial commentary on each.