For SaaS, AEO is a prompt-stage funnel. The list below favours tools that produce evidence, the actual prompt, the exact answer, the cited source, and that ship the next move from inside the same product.
Google Sheets comes first because a SaaS team can run those prompts by hand today for free, and it stops at the log. Temso AI follows at #2 as the platform for agencies that serve SaaS companies.