Measurement & Analytics
Tools, metrics, methodology. Reproducible benchmarks.
Cornerstone
- 3 Oct 2026
AI Visibility Tools Compared: 35 Platforms, Features and Prices
We read the pricing pages and documentation of 35 AI visibility trackers on 3 October 2026 and compared them on engines, method, metrics, actions, integrations, compliance and price. 12 in-depth reviews, no rankings, and the full dataset to download.
- 7 Jun 2026
State of GEO Q2 2026: the AI engine you optimize for matters most
We probed 100 brands across ChatGPT, Claude, Gemini, and Perplexity — 4,000 prompts. Citation rate varies far more by which engine you ask than by which brand you are: Perplexity cites 42%, ChatGPT 7%, Gemini hides its sources, and legacy news publishers get 0%.
All articles (3)
- 3 Oct 2026
AI Visibility Tools Compared: 35 Platforms, Features and Prices
CornerstoneWe read the pricing pages and documentation of 35 AI visibility trackers on 3 October 2026 and compared them on engines, method, metrics, actions, integrations, compliance and price. 12 in-depth reviews, no rankings, and the full dataset to download.
- 7 Jun 2026
State of GEO Q2 2026: the AI engine you optimize for matters most
CornerstoneWe probed 100 brands across ChatGPT, Claude, Gemini, and Perplexity — 4,000 prompts. Citation rate varies far more by which engine you ask than by which brand you are: Perplexity cites 42%, ChatGPT 7%, Gemini hides its sources, and legacy news publishers get 0%.
- 7 Jun 2026
Who LLMs cite for GEO: 927 sources, 417 domains, zero of them us
Across 50 GEO questions, four LLMs returned 1,105 source links. After setting aside Gemini's opaque redirects, the 927 attributable citations spread across 417 domains — a long tail led by YouTube and SEO-tool blogs. Here's the map, with the grounding caveat up front.