SendHeron

SendHeron is lifecycle and transactional email for software products, on one account and one API. Paste your website URL and it proposes the tag schema your app should emit, then drafts a complete lifecycle suite in your brand voice: welcome, trial, win-back, cancel-save. You read every draft and activate the sequences you want, one at a time. Sequences are built visually from the tags and segments your application sets, with triggers, delays and conditions. Templates are blocks or HTML, compiled on the server, and the same templates serve receipts and password resets. The REST API uses scoped tokens, ships with an SDK, and is documented so an AI agent can run it. Several products fit under one account and one subscription. Built by the team behind PostFast, and it has run PostFast's own lifecycle email since day one. Plans from €19 a month, 7-day trial, card required. EU company, contact data stored in EU.