# 100 Questions

100 Questions is a source-backed AI visibility benchmark. It compares one frozen buyer-question set across web-grounded answers from OpenAI, Claude, Gemini, and Grok, then reports brand mentions, prominence, competitor share of voice, claimed-domain citations, and provider coverage.

## Start here

- [Run an AI visibility benchmark](https://100questionsai.com/auth/sign-up)
- [Use the free AI visibility checker](https://100questionsai.com/ai-visibility-checker)
- [Browse the resource library](https://100questionsai.com/resources)
- [Read the methodology](https://100questionsai.com/methodology)
- [View a sample report](https://100questionsai.com/sample-report)
- [Explore the 2026 AI Visibility Index](https://100questionsai.com/ai-visibility-index)

## Company and policies

- [About the product and editorial team](https://100questionsai.com/about)
- [Contact and corrections](https://100questionsai.com/contact)
- [Support center](https://100questionsai.com/support)
- [Privacy](https://100questionsai.com/privacy)
- [Terms](https://100questionsai.com/terms)

## Machine-readable resources

- [Concise site index](https://100questionsai.com/llms.txt)
- [Full product and methodology reference](https://100questionsai.com/llms-full.txt)
- [Public API catalog](https://100questionsai.com/.well-known/api-catalog)
- [OpenAPI description](https://100questionsai.com/openapi.json)
- [Agent skills index](https://100questionsai.com/.well-known/agent-skills/index.json)
- [MCP server card](https://100questionsai.com/.well-known/mcp/server-card.json)
- [MCP documentation and public endpoint](https://100questionsai.com/mcp)
- [MCP documentation in Markdown](https://100questionsai.com/mcp.md)
- [Agent authentication guidance](https://100questionsai.com/auth.md)

## Important limitation

AI answers vary by provider, model, grounding source, locale, and time. Results are directional snapshots, not ranking guarantees. Failed or unsourced provider calls remain visible in coverage and are excluded from eligible-score denominators.