Shares Mailchimp's buildable sending core. ActiveCampaign layers behavioral automation on top — if a subscriber does X, wait, then do Y — which is a small workflow engine, the same challenge every automation-capable tool on this register faces.
VIBE SCORE 95/100
The parts this build actually needs, each rated on its own — the average is the Vibe Score above.
| Landing page | 99 |
| CRUD database | 95 |
| Email notifications | 91 |
Two real costs, not just "free": the AI agent's own usage, and hosting once it's running. Both are estimated from this app's own effort rating and component list — see the assumptions on the method page.
| AI agent — with a subscription (Claude Pro/Max, Cursor, etc.) | $0 marginal |
| AI agent — pay-per-use API, no subscription | $43–$86 one-time |
| Hosting, once it's running | $0/mo (free tier) |
| Domain name, if you want your own | ~$12/yr |
ActiveCampaign costs $29/mo. Even paying per-token with no subscription, and accounting for hosting, this build pays for itself in about 3 months.
Don't feel like building it? These are already made, open-source, and free.
Borderline. Shares Mailchimp's buildable sending core. ActiveCampaign layers behavioral automation on top — if a subscriber does X, wait, then do Y — which is a small workflow engine, the same challenge every automation-capable tool on this register faces.
ActiveCampaign costs $29/mo (about $348/yr) as of 2026-08. That's what a working rebuild would save you.
Branching automation based on subscriber behavior (opened this, clicked that) needs real event tracking wired into the workflow engine Deliverability at scale is the same ongoing reputation problem every sender on this register shares CRM-style contact scoring based on engagement adds real, separate scoring logic
Yes — Listmonk, Mautic are open-source options worth trying before you build your own. Details are in the standard parts section on this page.