Glances
Glances 4.5.9 closes out the 4.x line as a 5.0 beta opens for testing.
Comparison · Analytics
Calibre vs Sprig
A side-by-side editorial comparison of Calibre and Sprig — release velocity, themes, recent moves, and the top alternatives to consider.
Calibre vs Sprig: at a glance
| Feature | Calibre | Sprig |
|---|---|---|
| Sector | Analytics | Analytics |
| Velocity score | 6.3 | 3.8 |
| Sparks · 30d | 1 | 0 |
| Top themes | web-performance, mcp, coding-agents, rum | user-research, ai-agents, surveys, personalization |
| Last editorial update | 2h ago | 6mo ago |
| Website | Visit → | — |
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. It came days after Test Agents moved to Chrome 156 and Lighthouse 13.6.0. The latest entry is a design tidy-up that places each page's Guide link in the same top-right spot.
What is Sprig?
Sprig is layering AI agents on top of every step of the survey pipeline.
Sprig has spent six months turning surveys into an AI-augmented research pipeline. November opened with Conversational Surveys and MaxDiff. Q1 added Attribute Piping for personalization, Display Logic on Enterprise, AI Follow-up Question for adaptive probes, and prototype testing improvements. April delivered AI Dynamic Questions and the Synthesize Agent's AI Study Report. Two distinct threads run in parallel: classic survey-tooling depth, and named AI agents that handle the parts humans used to.
Calibre vs Sprig: 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. It came days after Test Agents moved to Chrome 156 and Lighthouse 13.6.0. The latest entry is a design tidy-up that places each page's Guide link in the same top-right spot.
◆ 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.
Sprig
3.8ANALYTICS
Sprig is layering AI agents on top of every step of the survey pipeline.
◆ Current state
Sprig has spent six months turning surveys into an AI-augmented research pipeline. November opened with Conversational Surveys and MaxDiff. Q1 added Attribute Piping for personalization, Display Logic on Enterprise, AI Follow-up Question for adaptive probes, and prototype testing improvements. April delivered AI Dynamic Questions and the Synthesize Agent's AI Study Report. Two distinct threads run in parallel: classic survey-tooling depth, and named AI agents that handle the parts humans used to.
◆ Where it's heading
The product is moving from a survey runner to an end-to-end research workflow with agents at the question, response, and analysis layers. Enterprise gating shows up consistently on the AI features, signaling that AI is the upsell. Expect more named agents (segmentation, recommendation, trend tracking) and tighter ties between agent outputs and product analytics.
◆ Prediction
The next directional move likely connects agent insights back into product surfaces and growth experiments, closing the research-to-action loop. AI Dynamic Questions and Display Logic should converge into a single adaptive-flow primitive available beyond Enterprise.
Alternatives to Calibre and Sprig
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 Sprig.
Dovetail
Dovetail opens its docs to Claude and ChatGPT as co-authors.
Apache SkyWalking
SkyWalking 11.1 builds service maps from OpenTelemetry traces, no SkyWalking agent required.
OpenReplay
OpenReplay's feed is Helm chart bumps behind its asset-cacher deny list.
Tinybird
Tinybird shrinks its Local image by a third after a run of observability updates.
OpenHouse
OpenHouse tightens view authorization and moves its optimizer schema to Flyway.
See all Calibre alternatives → · See all Sprig alternatives →
Recent activity from Calibre and Sprig
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoCalibreGuides: everything in its right place
- 7d agoCalibreCalibre MCP: connect your coding agent to your performance data ⚡
- 10d agoCalibreChrome 156 & Lighthouse 13.6.0
- 1mo agoCalibreCore Web Vitals Test, now with ad metrics
- 2mo agoCalibreSynthetic Metrics: All pages, segmented by Test Profile and Deployment
- 2mo agoCalibreSee the performance impact of every website deployment
- 6mo agoSprigNew: AI Study Report ⚡
- 6mo agoSprigAI Dynamic Questions
- 7mo agoSprigPrototype Testing Enhancements
- 8mo agoSprigAI Follow-up Question ⚡
- 8mo agoSprigNew: Display Logic
- 9mo agoSprigNew: Attribute Piping
Frequently asked questions
What is the difference between Calibre and Sprig?
They serve adjacent needs but don't currently overlap on shipped themes. Calibre is currently shipping more aggressively (velocity 6.3 vs 3.8), 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 Sprig?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Calibre is currently shipping more aggressively (velocity 6.3 vs 3.8), 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 Sprig?
Top Sprig alternatives in Analytics are ranked by recent ship velocity. Browse the "Sprig alternatives" section above for the current picks, or visit /alternatives/sprig for the full list with editorial commentary on each.