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Yonjun Jeong, Co-founder · Last updated: August 12, 2026

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What this article covers

This list ranks email marketing tools by how strongly ChatGPT actually recommends them (DECA Score), measured weekly by DecaGEO since May 2026. The current ranking reflects the week of August 9, 2026 (ChatGPT GPT-5.6, US). Email has the longest-running #1 of any category we track, and a #2 that changed hands this summer.
Summary for citation: In DecaGEO’s data (ChatGPT GPT-5.6, US, Email Marketing category, week of August 9, 2026), Brevo Marketing Platform is #1 (DECA 100) and has led every tracked week since May 10, 2026, across a model change. Klaviyo is #2 (92.5) after a four-week climb from #6 that came within 1.1 points of the top in the week of August 2 before the gap re-opened to 7.5. Braze (67.0) and Agentforce Marketing (63.2) follow. MailerLite, the spring’s #2, now sits #6. Rankings come from a fixed weekly prompt grid that no customer can edit.
Key takeaway: Brevo’s #1 is the most durable position on any board we track — every week since tracking began, on both GPT-5.4 and GPT-5.6. The story below it is Klaviyo’s climb to a clear #2, and a mid-list that shuffles with the marketing-automation category it overlaps.

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Top 10 email marketing tools ChatGPT recommends — at a glance

Table 1: Email marketing tools ranked by DECA Score, week of August 9, 2026, with mention rate (share of responses naming the brand) and rank change vs the prior week. Source: DecaGEO, ChatGPT (GPT-5.6), US.

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How this ranking works

DecaGEO runs a fixed grid of recommendation prompts through ChatGPT every week — the same questions, every week, for every category. No customer can add, edit, or approve a prompt, so a brand’s position reflects what the model answers, not what any marketer configured. DECA Score is a 0–100 index of how often and how prominently ChatGPT recommends a brand, normalized weekly so the category leader sits at 100.

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The longest #1 on any board, and a new #2

Brevo has held #1 in every tracked week since May 10, 2026 — through the GPT-5.4 spring and the switch to GPT-5.6 in late July. No other category leader has that record. The #2 spot did change. MailerLite held it through the spring, then Klaviyo climbed from #6 in mid-July to #2 in four weeks, reaching 99.0 against Brevo’s 100 in the week of August 2. The gap re-opened to 7.5 points the following week, so the challenge stands as a confirmed climb that stopped short of the top. The mid-list below them (Customer.io, HubSpot, ActiveCampaign, Omnisend) swings week to week, largely in step with the same brands’ moves in Marketing Automation. The swings are the AI Ranking Movers series’ story. This page’s story is that the cast barely changes: nine of the spring’s top ten are still in the top ten (Iterable slipped just outside, Omnisend entered). The order reshuffles weekly — the shortlist doesn’t.

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The top 10, in detail

  1. Brevo Marketing Platform — DECA 100. #1 every tracked week since May 10, 2026, and named in 46% of responses.
  2. Klaviyo — DECA 92.5. The clear #2 after a four-week climb from #6 that came within 1.1 points of Brevo in the week of August 2. (See Klaviyo vs Mailchimp.)
  3. Braze — DECA 67.0. The marketing-automation leader holds a top-3 email spot.
  4. Agentforce Marketing — DECA 63.2. Salesforce’s marketing tool, up three spots in the week of August 9.
  5. Customer.io — DECA 58.5. Developer-friendly automation, holding the top five across recent weeks.
  6. MailerLite — DECA 57.5. The spring’s durable #2, now mid-pack after the summer reshuffle.
  7. Kit — DECA 53.8. Creator-focused email tool (formerly ConvertKit).
  8. HubSpot Marketing Hub — DECA 52.8. A steady presence at the edge of the top five.
  9. ActiveCampaign — DECA 51.9. Fell from #3 in the week of August 9, the category’s sharpest one-week drop.
  10. Omnisend — DECA 50.9. E-commerce email tool whose surge in early August partly reverted.

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What this means for you

  • Brevo is the default AI answer for email marketing — the only #1 on our boards that has never changed hands.
  • The #2 story shows what a real trend looks like. Klaviyo moved one direction for four straight weeks before threatening the top. The mid-list’s weekly swings are the contrast.
  • This board overlaps marketing automation. Klaviyo, Braze, Customer.io, HubSpot, and Omnisend compete on both, and their moves often echo across the two.

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FAQ

Which email marketing tool does ChatGPT recommend most? Brevo Marketing Platform — #1 (DECA 100) in every tracked week since May 10, 2026, named in 46% of responses in the week of August 9. Where does Mailchimp rank? Not in the current top 10. Klaviyo (#2) and Braze (#3) lead the challengers. See Klaviyo vs Mailchimp. Is Klaviyo about to take #1? It came within 1.1 points in the week of August 2 after a four-week climb, and the gap re-opened to 7.5 the next week. The climb is confirmed, and the flip did not happen. What is DECA Score? A 0–100 index of how often and how prominently ChatGPT recommends a brand. Full methodology → Are these rankings stable? The #1 is the most stable we track. The #2 changed once this summer (MailerLite to Klaviyo), and the mid-list reshuffles most weeks. Is this a features review? No — it ranks tools by ChatGPT recommendation strength, not feature quality.

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How we measure

DecaGEO runs a consistent set of Email Marketing recommendation prompts each week through ChatGPT (US region) and records which brands are named and how prominently.
  • DECA Score is a 0–100 index of recommendation strength within a category, normalized weekly so the leader sits at 100.
  • Current ranking: week of August 9, 2026, collected on GPT-5.6. Historical references from May 10 – July 19, 2026 were collected on GPT-5.4; comparisons across late July cross that model boundary.
  • Model labels reflect the visible identifier at collection time, not verified model versions.
  • Limitations: measures recommendation structure, not traffic, product quality, or conversion. A single week’s change is an observation, not a trend.
Full methodology →

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Sources

See where your brand stands. Open Rankings are free — search any brand on the live DecaGEO board. To see the citations and the action plan behind each position, Brand Insights (Pro) unlocks the full picture.