What is the most popular newsletter platform?
Asked "What is the most popular newsletter platform?", ChatGPT, Copilot, Gemini, Google AI Mode and Perplexity named 8 distinct tools across 5 answers on September 7, 2026, and 6 of them in two or more answers, and all 5 engines agreed on Mailchimp, the only tool every engine named.
Measured acrossChatGPTCopilotGeminiGoogle AI ModePerplexity
6 of 8 names confirmed · named in 2 or more of 5 answers · asked September 7, 2026 · 5 engines
Mailchimp and Substack are among the most popular newsletter platforms, each leading in different use cases, with Mailchimp being a top choice for marketers and Substack for independent writers and paid subscriptions.
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LOCKED
The full measurement
- The position each of the 5 engines gave all 8 names.
- How many of the 5 answers named each of them.
- 24 sampled observations behind this ranking, and where the engines disagree.
- Fan-out — the query each engine actually searched.
- Every citation, and the sources nobody cited.