The Short Answer: Mailchimp and ActiveCampaign Lead
Buyers leaving Campaign Monitor, which appeared in 13% of 320 questions, are most frequently pointed to Mailchimp. This platform garnered 63% of mentions from AI assistants when users asked about email marketing tools. ActiveCampaign followed closely, named in 47% of questions. These figures represent the collective recommendations from the eight AI assistants measured: ChatGPT, Claude, Cohere, DeepSeek, Gemini, Grok, Mistral, and Perplexity, on 2026-06-04.
The term "alternative" here reflects what these AI assistants named alongside or instead of Campaign Monitor in response to real buyer questions. It isn't a qualitative judgment on a tool's superiority, but rather a direct measurement of how often each platform appeared in the assistants' responses. For example, some common buyer questions included "What are the top email marketing platforms for small businesses?" and "Looking for an email marketing tool with solid automation features." The high mention rates for Mailchimp and ActiveCampaign suggest these tools are consistently associated with a broad range of such common buyer needs.
Beyond the top two, Brevo secured 41% of mentions, with HubSpot at 40%, and Klaviyo at 38%. Constant Contact was named in 25% of questions, while MailerLite and ConvertKit received 20% and 19% respectively. These numbers provide a clear picture of the market perception reflected in AI recommendations, indicating which tools are top-of-mind when users seek alternatives in the email marketing space. It's a snapshot of the digital landscape, showing where AI models guide users when they're exploring options beyond Campaign Monitor.
How AI Assistants Pick Alternatives
AI assistants don't "pick" alternatives in a human sense; their recommendations are a direct reflection of their training data. These models, like ChatGPT, Claude, and Gemini, are trained on vast datasets of text and code from the internet. When a user asks a question about email marketing tools or alternatives to a specific platform, the AI generates a response based on patterns, associations, and prominence found within that training data. A tool's frequent appearance in buyer guides, reviews, and discussions online likely leads to higher mention rates.
This mechanism explains why certain tools consistently rank higher. If a platform is widely discussed in relation to "small businesses" or "ease of use" across countless web pages, the AI is more likely to suggest it when those keywords appear in a user's query. The percentages we see aren't arbitrary; they're statistical outputs. A 63% mention rate for Mailchimp means that in a significant majority of relevant queries, the AI models found strong associations between the user's need and Mailchimp within their datasets.
It's important to understand that the AI isn't making a value judgment. It's processing information. The tools it recommends most often are those that have the strongest and most frequent connections to the types of questions buyers ask. This means market presence, effective online content, and frequent user discussion directly influence a tool's visibility in AI-generated recommendations. The more a tool is discussed in relevant contexts, the more often it'll show up when AI assistants field buyer inquiries.
The Leading Alternatives: Mailchimp and ActiveCampaign
Mailchimp's dominant 63% mention rate positions it as the most frequently recommended alternative to Campaign Monitor. This strong showing likely reflects its broad market presence and reputation for user-friendliness, making it a common suggestion for buyers asking about "top email marketing platforms for small businesses" or seeking a "best email marketing solution for a non-technical founder." Its accessibility and extensive feature set for basic to intermediate needs probably contribute to its widespread recommendation by AI assistants.
ActiveCampaign, with its 47% mention rate, consistently appears as another top alternative. Its strong performance suggests it's frequently associated with more advanced needs. Buyers looking for "solid automation features" or prioritizing tools for "lead nurturing" would likely find ActiveCampaign among the AI's top suggestions. This platform is known for its sophisticated automation capabilities and CRM integrations, which aligns well with the complexity implied by such buyer questions.
The collective AI responses indicate that while Mailchimp serves a broad segment, ActiveCampaign appeals to users with more specific, growth-oriented requirements. These two platforms aren't just popular; their features are evidently well-documented and frequently discussed in contexts relevant to common buyer pain points, making them highly visible to the AI models across the measured assistants including ChatGPT, Claude, and Perplexity.
Other Prominent Alternatives
Brevo, named in 41% of questions, stands as a strong contender among the alternatives. Its consistent appearance suggests it addresses a significant portion of buyer needs that AI assistants identify. Following closely, HubSpot garnered 40% of mentions. HubSpot's comprehensive marketing suite likely makes it a recommendation for buyers with broader needs, possibly including those looking for tools that integrate well with other business functions, or perhaps for an "agency with multiple clients."
Klaviyo, with 38% of mentions, shows a notable presence. Its frequent recommendation likely stems from its strong association with e-commerce. Buyers asking about "email marketing tools that integrate well with e-commerce platforms" would likely see Klaviyo appear in the AI's suggestions, given its specialized features for online retailers. This reflects a clear niche for the platform within the broader email marketing landscape.
Further down the list, Constant Contact received 25% of mentions, MailerLite 20%, and ConvertKit 19%. These platforms, while not leading, still appear in a meaningful number of recommendations. Their consistent, albeit lower, mention rates indicate they cater to specific segments or offer features that resonate with particular buyer questions, ensuring their presence in the collective AI recommendations across all eight assistants.
Where the Assistants' Recommendations Diverge
The eight AI assistants—ChatGPT, Claude, Cohere, DeepSeek, Gemini, Grok, Mistral, and Perplexity—collectively presented a varied set of alternatives. While Mailchimp took 63% of mentions, and ActiveCampaign 47%, the significant percentages for Brevo (41%), HubSpot (40%), and Klaviyo (38%) show no single tool dominates all recommendations. This spread likely reflects the diverse nature of buyer questions, which ranged from "small businesses" to "solid automation" and "e-commerce integration." It's not that the assistants "disagree" in a human sense, but rather their training data leads them to highlight different tools depending on the inferred context of a query.
The varying mention rates across these tools indicate that while some options are more broadly popular, others are consistently recommended for specific use cases. This suggests AI models are not just ranking general popularity, but also attempting to match tool capabilities to user needs as understood from their training. For instance, a query focused on e-commerce might see Klaviyo (38%) gain prominence, even if Mailchimp (63%) is generally more cited.
This diversity in recommendations shows a key point: no single email marketing tool is universally "best." The AI models, by presenting a range of options with varying mention frequencies, are implicitly guiding users toward a more nuanced decision. They reflect the market's complexity, where different tools solve different problems for different types of users, rather than pushing one-size-fits-all solutions. The breadth of recommendations is a direct response to the many-sided nature of buyer inquiries.
Choosing Among the Alternatives
Selecting the right email marketing tool from these AI-recommended alternatives hinges entirely on your specific needs. The data shows Mailchimp's 63% mention rate suggests it's a strong fit if your business is small or you're a non-technical founder looking for an intuitive platform. It's often cited for ease of use and general marketing campaigns, aligning with common entry-level requirements.
If "solid automation features" and "lead nurturing" are your priorities, ActiveCampaign, with its 47% mention rate, appears to be a more suitable choice. Its advanced capabilities are frequently highlighted for businesses that need sophisticated workflows and customer journey mapping. For those in e-commerce, Klaviyo's 38% mention rate indicates it's a highly recommended solution, likely due to its specialized integrations and features tailored for online stores.
An agency managing "multiple clients" might find HubSpot (40%) or ActiveCampaign (47%) more appropriate given their broader feature sets and potential for client management. Matching your core requirements—whether it's ease of use, automation depth, e-commerce focus, or agency-level features—to the strengths implied by these AI recommendations is the most effective way to choose. The AI's collective advice points to a diverse market, where specialized tools exist for specialized needs.