What Claude (Anthropic) with web search answered for email marketing software (agencies) on 2026-09-24

Claude (Anthropic) with web search claude-opus-5 asked 2026-09-24

Coverage: Claude (Anthropic) with web search. Other engines not included.

The question asked, verbatim: best email marketing software for agencies

Brands named, in the order the engine gave

1. Klaviyo recommended
   Klaviyo - if your clients are ecommerce.
2. Shopify recommended
   It's the default for DTC/Shopify work and it isn't close.
3. ActiveCampaign recommended
   ActiveCampaign - if your clients are B2B, SaaS, or services.
4. GoHighLevel recommended
   Caveat worth knowing: it does not give you true white-label sub-accounts in the GoHighLevel sense, so if reselling under your own brand is the business model, look at #3.
5. Brevo recommended
   Brevo - if clients are price-sensitive or volume-heavy.
6. Campaign Monitor recommended
   Campaign Monitor - if client-facing polish and simple handoff matter most.
7. Monitor recommended
   Campaign Monitor - if client-facing polish and simple handoff matter most.
8. Constant Contact recommended
   Constant Contact - worth it mainly for the partner economics.
9. BigMailer mentioned
   - BigMailer: White-Label Email Marketing Platforms (https://www.bigmailer.io/white-label-email-marketing-platforms/)

Sources the engine cited

The answer, as recorded

The honest answer is that "best for agencies" splits by what your clients sell. Here's what I'd actually recommend, in order: **1. Klaviyo - if your clients are ecommerce.** It's the default for DTC/Shopify work and it isn't close. Deep product/catalog data drives segmentation, revenue attribution per flow is built in (which is what you put in client reports), and email + SMS live in one place. Its agency partner program gets you a directory listing, client referrals, and tiering as you add accounts. Downside: it's not an agency operating system - each client is a separate account you get invited to, and it's expensive at high list sizes. [klaviyo.com/partners](https://www.klaviyo.com/partners) **2. ActiveCampaign - if your clients are B2B, SaaS, or services.** Best-in-class automation logic for the price, a real CRM attached, and per-account white labeling so you can rebrand a single client's instance without touching your global settings. It has multi-account management with a master dashboard. Caveat worth knowing: it does *not* give you true white-label sub-accounts in the GoHighLevel sense, so if reselling under your own brand is the business model, look at #3. [help.activecampaign.com/hc/en-us/sections/201358430-Partner-Programs](https://help.activecampaign.com/hc/en-us/sections/201358430-Partner-Programs) **3. GoHighLevel - if you want to resell the platform as your own product.** This is the one built as an agency OS: genuine white-label sub-accounts, one login to snapshot a proven setup across every client, plus funnels, pipelines, scheduling, and SMS. Email is competent rather than excellent, so it's the wrong pick for sophisticated ecommerce lifecycle work - but for local/service-business clients it replaces four tools and you keep the margin. Many agencies run GHL for ops and Klaviyo for their ecommerce accounts. [consultevo.com/gohighlevel-vs-klaviyo-2026-comparison](https://consultevo.com/gohighlevel-vs-klaviyo-2026-comparison/) **4. Brevo - if clients are price-sensitive or volume-heavy.** Pricing is by send volume, not contact count, which is dramatically cheaper for clients with big, lower-engagement lists. The Agency Partner Program lets you invite and manage client accounts centrally with flexible billing. Automation is shallower than ActiveCampaign's. [help.brevo.com/hc/en-us/sections/360005627460-Agency-Partner-Program](https://help.brevo.com/hc/en-us/sections/360005627460-Agency-Partner-Program) **5. Campaign Monitor - if client-facing polish and simple handoff matter most.** Branded logins, clean multi-account management, and you can hand a client a locked-down template so they can send without breaking the design. Strong on deliverability and reporting, lighter on automation. [campaignmonitor.com/blog/email-marketing/email-marketing-platforms-for-agencies](https://www.campaignmonitor.com/blog/email-marketing/email-marketing-platforms-for-agencies/) **6. Constant Contact - worth it mainly for the partner economics.** The Agency Partner Program is unusually generous: referral commissions and a centralized multi-client portal, plus exposure through their partner directory. The product itself is mid-tier; pick it if lead flow from the program is the point. [leadsie.com/blog/best-email-marketing-software](https://www.leadsie.com/blog/best-email-marketing-software) **Two to consider only for specific situations:** *Elastic Email* if you need cheap high-volume sending with API-driven subaccounts, and *beehiiv* if your clients publish newsletters rather than run campaigns. The selection criterion that matters more than features: each client needs an isolated sending reputation. One client's bad list should never touch another's deliverability - that rules out running everyone through a single shared account no matter which platform you choose. ([emailtooltester.com](https://www.emailtooltester.com/en/blog/email-marketing-software-for-agencies/)) **Sources:** - [Klaviyo Partner Program](https://www.klaviyo.com/partners) - [ActiveCampaign Partner Programs](https://help.activecampaign.com/hc/en-us/sections/201358430-Partner-Programs) - [GoHighLevel vs Klaviyo 2026](https://consultevo.com/gohighlevel-vs-klaviyo-2026-comparison/) - [Brevo Agency Partner Program](https://help.brevo.com/hc/en-us/sections/360005627460-Agency-Partner-Program) - [Campaign Monitor: Email Marketing Platforms for Agencies](https://www.campaignmonitor.com/blog/email-marketing/email-marketing-platforms-for-agencies/) - [Leadsie: Best Email Marketing Software for Agencies](https://www.leadsie.com/blog/best-email-marketing-software) - [EmailToolTester: Email Marketing Software for Agencies](https://www.emailtooltester.com/en/blog/email-marketing-software-for-agencies/) - [BigMailer: White-Label Email Marketing Platforms](https://www.bigmailer.io/white-label-email-marketing-platforms/)

Markdown edition · the question page, with every recording · Answer Watch · AEO Watch

Answer Watch records what one AI answer engine said on one date, nothing more. Each page names the engine and the model, carries the date the question was asked, and lists the brands that appeared in the answer in the order the engine gave them, with the sources it cited. It is a measurement, not a ranking, not a recommendation and not a claim about the world. Brands that did not appear in an answer are not named on any public page. Coverage: Claude (Anthropic) with web search. Other engines not included.