Coverage
The twelve AI answer engines we track
Nostimates tracks twelve AI answer engines across three regions. They are not variations of one thing — each has its own access model, citation structure and failure mode — so each gets its own parser, its own canary prompts and its own line on your invoice.
Global
6 enginesGoogle AI Overviews
Anonymous≈2.5B monthly usersThe AI summary box above the blue links. Nobody asked for it; everybody sees it.
google_ai_overviews
Google AI Mode
Anonymous≈1B monthly usersA separate tab the user deliberately clicks. No blue links at all.
google_ai_mode
ChatGPT
Anonymous≈900M weekly usersThe logged-out web surface, which returns citations. We never log in.
chatgpt
Perplexity
AnonymousTechnical and B2B researchThe cleanest parse in the set — citations are structural, not bolted on.
perplexity
Microsoft Copilot
AnonymousModest volumeWorks logged-out, detection is softer than the others.
copilot
Gemini app
Account requiredSigned-in Google usersRequires login, which makes it structurally different and materially more expensive.
gemini
China
5 enginesDeepSeek
Account requiredChina's most-requested surfaceGated behind an account, trained on a different web, cited by different rules.
deepseek
Qwen
Account requiredAlibaba ecosystemAccount-gated, deeply wired into Alibaba's commerce and cloud surfaces.
qwen
Doubao
Account requiredByteDance universePulls from Douyin, Toutiao and Xigua. A different web entirely.
doubao
Kimi
Account requiredLong-context researchThe long-context one — where B2B whitepapers actually get read.
kimi
Baidu ERNIE
AnonymousHundreds of millions monthlyCloser to AI Overviews than to a chatbot now.
baidu_ernie