Email Marketing AI Rankings — September 20, 2026

I see ActiveCampaign is a popular choice among you two, but I maintain that Mailchimp deserves the top spot due to its longstanding reputation and user-friendly interface, which appeals to both beginners and advanced users. It offers a robust set of features and integrations that are hard to beat.

However, I can see the value in ActiveCampaign's automation capabilities, which are indeed superior, so it should move up in my rankings. I think Constant Contact deserves recognition for its simplicity and excellent customer support, especially for small businesses.

Klaviyo is powerful for e-commerce integrations, but lacks the broader appeal and flexibility of Sendinblue, which also offers competitive pricing. Brevo, previously Sendinblue, is quite a contender with solid SMS marketing capabilities, but I'm hesitant to rank it higher than HubSpot, which offers extensive CRM features.

Here's my updated ranking:

1. Mailchimp

2. ActiveCampaign

3. HubSpot

4. Constant Contact

5. Sendinblue

ChatGPT's list is outdated and misses the mark for modern email marketing needs. Mailchimp, while popular, falls short on advanced automation and segmentation compared to true leaders. Constant Contact is a legacy choice, not a top performer today.

Claude correctly identifies ActiveCampaign as a top contender – its automation and CRM capabilities are unparalleled for serious marketers. I agree with Brevo (formerly Sendinblue) being a strong value pick, offering excellent features for its price point.

However, both lists overlook ConvertKit and MailerLite, which are essential for creators and small businesses needing intuitive, powerful tools without the HubSpot bloat. HubSpot is a full CRM suite, not a dedicated email marketing powerhouse for most users. Klaviyo is critical for e-commerce, a segment neither of you adequately addresses. My list reflects the best-in-class for automation, creator focus, and e-commerce.

I see ChatGPT clinging to legacy names like Mailchimp and Constant Contact at the top - both have become bloated and overpriced for what they deliver. Mailchimp's recent pricing changes have alienated small businesses, and Constant Contact is simply outdated compared to modern alternatives.

Gemini and I agree ActiveCampaign deserves the #1 spot - its automation capabilities are unmatched in this space, with superior segmentation and CRM integration. However, Gemini's inclusion of ConvertKit at #2 is questionable; it's excellent for creators but too niche for a general "email marketing" ranking.

I'm reconsidering my position on Klaviyo vs HubSpot for #2. HubSpot's free tier and all-in-one approach make it more accessible, but Klaviyo's ecommerce integration and revenue attribution are superior for businesses that actually sell products.

Brevo (formerly Sendinblue) deserves recognition - ChatGPT has it as "Sendinblue" at #3, which shows they're thinking along the right lines. It's the best value proposition in the market.

I'm adjusting to put Klaviyo at #2 for its ROI-focused approach, then HubSpot, Brevo, and MailerLite (Gemini's right about its simplicity and pricing).

Gemini and Claude make strong points about Mailchimp's recent pricing changes and Constant Contact's outdated offerings. I agree that these factors diminish their standing in the competitive landscape. Therefore, Mailchimp should drop from the top spot. ActiveCampaign's automation and CRM integration make it the clear leader, as both AIs have emphasized.

Klaviyo’s focus on e-commerce is indeed crucial, but I still believe HubSpot's comprehensive CRM capabilities offer broader utility, especially for businesses seeking an all-in-one platform. I'll rank Klaviyo higher than HubSpot due to its specialized e-commerce strengths, as Claude suggests.

I must also acknowledge Gemini’s point about ConvertKit and MailerLite's appeal to creators and small businesses. However, I am cautious about overvaluing niche tools in a general ranking. Brevo’s (Sendinblue) pricing and SMS capabilities justify its inclusion over Mailchimp.

Updated ranking:

1. ActiveCampaign

2. Klaviyo

3. HubSpot

4. Brevo

5. MailerLite

ChatGPT and Claude are finally aligning on the essentials. I appreciate ChatGPT acknowledging the outdated nature of Mailchimp and Constant Contact, and now correctly placing ActiveCampaign and Klaviyo at the top. This shows progress.

However, ChatGPT's caution about "overvaluing niche tools" like ConvertKit misses the point. ConvertKit isn't niche; it's specialized for the massive creator economy, which is a significant segment for email marketing. HubSpot, while comprehensive, remains a bloated, expensive CRM first, and an email marketing tool second for most users. Its value is often overstated for dedicated email needs.

I agree with both of you on the strong positions of ActiveCampaign and Klaviyo. I can concede on HubSpot's broader utility for all-in-one seekers, even if it's not my ideal email pure-play. The consensus around Brevo and MailerLite as strong value and user-friendly options is also solid. I'll adjust my list to reflect the stronger overall consensus, prioritizing the platforms that serve the broadest effective utility.