Best Free AI Visibility Tools & Checkers (2026)

HubSpot's AI Search Grader is a free tool that gives a quick AI visibility grade, functioning largely as top-of-funnel for HubSpot's platform. It is accessible and free but shallow, with no ongoing monitoring or prioritized fixes.

• Completely free to use
• Backed by the well-known HubSpot brand
• Simple, accessible entry point to AI visibility

Otterly.AI is a bootstrapped, well-reviewed AI search monitoring tool and one of the cheapest credible self-serve options. It covers the major engines and is popular with marketers, though it remains monitoring-focused and its engine count is somewhat overstated.

• One of the cheapest credible self-serve options
• Bootstrapped and profitable with a lean team
• High G2 rating around 4.8 across 250+ reviews [verify]

Athena HQ is a Y Combinator-backed GEO/AEO platform from an ex-Google Search team, with strong logos and high ratings. It offers a free credit tier but its paid entry price is steep, and its fix-oriented Action Center is still developing.

• Y Combinator W25 with credible founding team (ex-Google Search, ex-ServiceNow)
• Analyzes 300K+ sites [verify]
• Strong customer logos including Coinbase, SoFi and PagerDuty [verify]

Profound is the best-funded and most widely recognized AI visibility platform, aimed squarely at large enterprises. It monitors the broadest set of engines and is used by major brands, but its dashboard is complex and it has moved away from self-serve pricing.

• Broadest engine coverage (8-9 engines including AI Mode, Copilot, DeepSeek)
• Deepest funding and fastest growth in the category
• Trusted by large enterprises including Walmart, Comcast and Estée Lauder [verify]

Rankscale is a bootstrapped AEO/GEO tool covering 17+ engines at a low entry price. It is affordable and broad, but its credit-based pricing is unpredictable, scores can swing week-to-week, and it lacks revenue attribution.

• Covers 17+ engines
• Low entry price from $20/mo
• Bootstrapped and lean