EmailOctopus is the low-cost email-marketing service operated by Three Hearts Digital Ltd at 86-90 Paul Street, London EC2A 4NE, United Kingdom. The product targets indie creators, bloggers, small SMBs, and price-sensitive marketers who want a Mailchimp / MailerLite / ConvertKit alternative with a particularly generous free tier (free up to a meaningful subscriber count) and competitive paid pricing, for example approximately $480/year at 100,000 subscribers. The brand is well-known in the indie-hacker and content-creator community.
For an EU-sovereignty audit the listing has structural caveats. The operating entity is UK-incorporated post-Brexit (UK adequacy decision under Art. 45 GDPR keeps transfers EU↔UK legally clean), and the sending path is now documented rather than assumed. The published sub-processor list names Bird and its EU-based infrastructure for campaign sending on the regular EmailOctopus service; Amazon SES survives only inside EmailOctopus Connect, the bring-your-own-sending-account product, so SES is no longer the customer-campaign backbone. The US exposure is the infrastructure underneath instead: the same list states that all of EmailOctopus's infrastructure runs on AWS virtual servers located within the European Union, in the Ireland region, with customer data stored there, so a US-owned hyperscaler is the store of record even though the region is Irish: Significative. There are no public ISO 27001 or SOC 2 certifications, but the DPA is a publicly readable PDF and the sub-processor list is public and reachable without a login.
Pricing is quoted in USD: a Starter tier that is free forever at 2,500 subscribers and 10,000 emails a month with EmailOctopus branding, then Pro from US$9/month on annual billing, a 10% discount against the monthly rate. Best fit: indie creators, low-volume bloggers, small SMBs, and price-sensitive marketers who want a serviceable Mailchimp alternative and accept a UK counter-party with AWS Ireland underneath. Procurement-grade EU buyers who need the infrastructure itself off a US-owned hyperscaler should choose rapidmail (DE) at SMB tier, or Inxmail or Maileon at enterprise.