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 Germany.
Features
- AI setup: paste a URL, approve the tag schema, read the drafted lifecycle suite, activate what you want
- Visual sequence builder with triggers, delays, conditions and sends
- Tags and segments set by your own application
- Transactional and marketing email on one account and one API
- Templates as blocks or HTML, compiled on the server
- REST API with scoped tokens, an SDK, and docs written for AI agents
- Several products under one account and one subscription
- Free deliverability tools: SPF, DKIM and DMARC checkers, DMARC record generator
- Contact data stored and processed in Germany, sent through Amazon SES in Frankfurt
Use Cases
- SaaS onboarding and trial-conversion sequences
- Win-back and cancel-save flows triggered by tags your app sets
- Receipts, password resets and other transactional mail from the same templates
- Founders who want the lifecycle suite drafted for approval instead of built from a blank canvas
- Agencies or founders running several products on one subscription
- Products that need contact data kept in the EU
Comments
The "paste a URL, approve the drafted suite" model is a smart fix for the blank-canvas problem — most founders know they need lifecycle email but never build the sequences. Two genuine questions: does the AI-drafted suite adapt to real product events (trial started, payment failed, feature used), or are these mostly time-based templates I wire to my own tags? And with several products on one subscription, how isolated is sender reputation between them? The free deliverability tooling (SPF, DKIM, DMARC checkers) is a nice trust-builder for exactly the audience that struggles with this.
I run PostFast, a social media scheduler. Its lifecycle email (welcome, trial, win-back, cancel-save) needed a tool that could send sequences and transactional mail from one place, so I built one, and SendHeron has sent PostFast's own email since day one. The part I am most curious about is the setup step. You paste your website URL, SendHeron proposes the tags your app should emit and drafts the whole lifecycle suite in your voice. Nothing sends until you read it and switch it on. If you try it, tell me where the drafts miss, that is what I want to hear. Plans start at 19 euro a month with a 7-day trial. Ask me anything here.
Having it propose the tag schema from a URL & then draft the lifecycle suite (welcome, trial, win-back, cancel-save) in your brand voice solves the blank-page problem most teams hit with email. The "you approve every word before it goes live" step is a nice touch too. Does the tag schema export cleanly to a dev as a checklist, or is it mainly used inside the builder?
Premium Products
Sponsors
Buy
Makers
Makers
Comments
The "paste a URL, approve the drafted suite" model is a smart fix for the blank-canvas problem — most founders know they need lifecycle email but never build the sequences. Two genuine questions: does the AI-drafted suite adapt to real product events (trial started, payment failed, feature used), or are these mostly time-based templates I wire to my own tags? And with several products on one subscription, how isolated is sender reputation between them? The free deliverability tooling (SPF, DKIM, DMARC checkers) is a nice trust-builder for exactly the audience that struggles with this.
I run PostFast, a social media scheduler. Its lifecycle email (welcome, trial, win-back, cancel-save) needed a tool that could send sequences and transactional mail from one place, so I built one, and SendHeron has sent PostFast's own email since day one. The part I am most curious about is the setup step. You paste your website URL, SendHeron proposes the tags your app should emit and drafts the whole lifecycle suite in your voice. Nothing sends until you read it and switch it on. If you try it, tell me where the drafts miss, that is what I want to hear. Plans start at 19 euro a month with a 7-day trial. Ask me anything here.
Having it propose the tag schema from a URL & then draft the lifecycle suite (welcome, trial, win-back, cancel-save) in your brand voice solves the blank-page problem most teams hit with email. The "you approve every word before it goes live" step is a nice touch too. Does the tag schema export cleanly to a dev as a checklist, or is it mainly used inside the builder?
Premium Products
New to Fazier?
Find your next favorite product or submit your own. Made by @FalakDigital.
Copyright ©2026. All Rights Reserved