Mailchimp's price scales with your list. OCCS's price scales with what you send.
Same email infrastructure tier — bring your own Postmark account (SPF/DKIM/DMARC enforced) or any SMTP. The difference: OCCS bundles social, paid ads, blog, SEO, and AI generation under one brand spine. Mailchimp is email-first; OCCS is multi-channel-first.
OCCS
$0 from OCCS per email. You bring your own Postmark (free up to 3K/mo, $15/mo for 10K) or any SMTP. No per-contact pricing on the OCCS side at all.
Mailchimp
Standard $20/mo at 500 contacts → $135/mo at 10K → $385/mo at 25K. Pay even if you don't send.
Source: mailchimp.com/pricing (checked 2026-05-07; Standard tier) · postmark.com/pricing (checked 2026-05-21)
Monthly cost — by send volume
1K emails/mo
OCCS saves 100%
10K emails/mo
OCCS saves 89%
100K emails/mo
OCCS saves 92%
Assumes one send per month (10K emails/mo → 10K-contact list). Mailchimp's free tier covers 500 contacts and 1,000 sends/mo total — fine for a tiny list. Past that, Standard tier scales with list size. OCCS itself charges nothing per email; the cyan series is Postmark's published BYO pricing (free tier covers 1K/mo here).
Feature-by-feature
Honest comparison. Where Mailchimp ships the same capability we say so — the moat is in the rows where they don't.
| Feature | OCCS | Mailchimp |
|---|---|---|
| Drag-and-drop email composer | ||
| A/B subject + body tests | ||
| List segmentation | ||
| Sequences / multi-step drips | ||
| Email + SMS in one sequence | — | |
| Shopify cart-abandonment auto-trigger sequence (cancels on order) | — | |
| Per-recipient AI talking-head video at broadcast time (animated-GIF inbox preview) | — | |
| Talking-head opener spliced onto creatives (cross-product reuse) | — | |
| Lead scoring (engagement window + role/seniority parsing) | — | |
| Multi-channel publishing (Meta / Google / TikTok / X / LinkedIn / YouTube) | — | |
| Built-in blog studio + SEO command center | — | |
| AI brand-voice grounding from website crawl | — | |
| Sales videos (script → narration → composite) | — | |
| Creative generation (13 platform presets) | — | |
| Pricing by send volume, not list size | — |
Bottom line
If you only need email, Mailchimp's flat tier is fine. If you need email plus the rest of marketing — social, paid, blog, SEO, AI creative — running Mailchimp + Buffer + Hootsuite + Jasper + Semrush adds up. OCCS replaces the stack.
Common questions
Can I migrate my Mailchimp list and tags?
Does OCCS handle merge fields and personalization?
What about Mailchimp's audience / journey builder?
Ready to switch?
Free tier, no card required. Run OCCS in parallel with Mailchimp for 14 days — keep what works.