> ## Documentation Index > Fetch the complete documentation index at: https://decageo.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Best Email Marketing Tools in 2026: Which Ones Does ChatGPT Actually Recommend? > The top email marketing tools ranked by what ChatGPT actually recommends (DECA Score). Brevo has held #1 every tracked week since May 2026, and Klaviyo has climbed to a clear #2. Updated for the week of August 9, 2026. [**Yonjun Jeong**](https://www.linkedin.com/in/yonjun-jeong-7bb05a65/), Co-founder · Last updated: August 12, 2026 ## 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. ## Top 10 email marketing tools ChatGPT recommends — at a glance | # | Tool | DECA Score | Mention rate | vs Aug 2 | | -: | ------------------------ | ---------: | -----------: | :------: | | 1 | Brevo Marketing Platform | 100.0 | 46% | = | | 2 | Klaviyo | 92.5 | 43% | = | | 3 | Braze | 67.0 | 28% | ▲2 | | 4 | Agentforce Marketing | 63.2 | 23% | ▲3 | | 5 | Customer.io | 58.5 | 24% | ▼1 | | 6 | MailerLite | 57.5 | 27% | ▲3 | | 7 | Kit | 53.8 | 23% | ▲3 | | 8 | HubSpot Marketing Hub | 52.8 | 20% | = | | 9 | ActiveCampaign | 51.9 | 20% | ▼6 | | 10 | Omnisend | 50.9 | 20% | ▼4 | *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.* ## 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](https://decageo.ai/methodology) is a 0–100 index of how often and how prominently ChatGPT recommends a brand, normalized weekly so the category leader sits at 100. ## 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](https://decageo.ai/docs/best-tools/best-marketing-automation-tools). The swings are the [AI Ranking Movers series](/docs/ai-ranking-changes/2026-08-09)' 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. ## The top 10, in detail 1. [**Brevo Marketing Platform**](https://decageo.ai/products/brevo-marketing-platform/category/email-marketing) — DECA 100. #1 every tracked week since May 10, 2026, and named in 46% of responses. 2. [**Klaviyo**](https://decageo.ai/products/klaviyo/category/email-marketing) — 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](https://decageo.ai/docs/best-tools/klaviyo-vs-mailchimp).) 3. [**Braze**](https://decageo.ai/products/braze/category/email-marketing) — DECA 67.0. The marketing-automation leader holds a top-3 email spot. 4. [**Agentforce Marketing**](https://decageo.ai/products/agentforce-marketing/category/email-marketing) — DECA 63.2. Salesforce's marketing tool, up three spots in the week of August 9. 5. [**Customer.io**](https://decageo.ai/products/customer.io/category/email-marketing) — DECA 58.5. Developer-friendly automation, holding the top five across recent weeks. 6. [**MailerLite**](https://decageo.ai/products/mailerlite/category/email-marketing) — DECA 57.5. The spring's durable #2, now mid-pack after the summer reshuffle. 7. [**Kit**](https://decageo.ai/products/kit/category/email-marketing) — DECA 53.8. Creator-focused email tool (formerly ConvertKit). 8. [**HubSpot Marketing Hub**](https://decageo.ai/products/hubspot-marketing-hub/category/email-marketing) — DECA 52.8. A steady presence at the edge of the top five. 9. [**ActiveCampaign**](https://decageo.ai/products/activecampaign/category/email-marketing) — DECA 51.9. Fell from #3 in the week of August 9, the category's sharpest one-week drop. 10. [**Omnisend**](https://decageo.ai/products/omnisend/category/email-marketing) — DECA 50.9. E-commerce email tool whose surge in early August partly reverted. ## 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. ## 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](https://decageo.ai/docs/best-tools/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 →](https://decageo.ai/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. ## 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 →](https://decageo.ai/methodology) ## Sources * DecaGEO Email Marketing recommendation data, ChatGPT, US, weeks of May 10 – August 9, 2026. * Live board: [DecaGEO Email Marketing ranking](https://decageo.ai/category/email-marketing). * Weekly change reports: [AI Ranking Movers series](/docs/ai-ranking-changes/2026-08-09). * Related: [Best Marketing Automation Tools](https://decageo.ai/docs/best-tools/best-marketing-automation-tools) · [Klaviyo vs Mailchimp](https://decageo.ai/docs/best-tools/klaviyo-vs-mailchimp). *** **See where your brand stands.** Open Rankings are free — search any brand on the [live DecaGEO board](https://decageo.ai/). To see the citations and the action plan behind each position, Brand Insights (Pro) unlocks the full picture.