Pick Buttondown if
writers who will stay on Free at $0 (100 subscribers) while they open a first Write draft, then Basic at $9/month (1,000 subscribers) — not Standard $29 unless they need 5,000, and not Professional $79 unless they need 10,000.
Read the Buttondown pagePick Loops if
saaS teams who will stay on Free $0 (1,000 subscribed contacts, 4,000 marketing+transactional sends / 30 days, Loops footer, 10 emails/sec, no card) while they send a first onboarding mail, then land on Growth at $49/month (starts at 5,000 subscribed contacts on the card we fetched; slider continues) when they need unlimited sends and the branding off.
Read the Loops page