Composing a campaign and sending it to a list is one transactional-email API call per recipient. The part Mailchimp actually sells is what happens after send: staying off spam blocklists at scale, which is a reputation problem, not a coding problem.
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 |
Don't feel like building it? These are already made, open-source, and free.
Borderline. Composing a campaign and sending it to a list is one transactional-email API call per recipient. The part Mailchimp actually sells is what happens after send: staying off spam blocklists at scale, which is a reputation problem, not a coding problem.
Mailchimp costs $13/mo (about $156/yr) as of 2026-08. That's what a working rebuild would save you.
Deliverability — staying out of spam folders — is an ongoing reputation game tied to sending domain and volume history, not something you can build once and forget Bounce and complaint handling, unsubscribe compliance (CAN-SPAM, GDPR) need to be genuinely correct, not just present Their analytics, A/B testing, and audience insights are a real second product on top of the sending pipeline
Yes — Listmonk, Mautic are open-source options worth trying before you build your own. Details are in the standard parts section on this sheet.