Klaviyo charges more because your list grew. OCCS charges $0 for the send itself.
OCCS doesn't bill per email — you bring your own Postmark account (free tier 3K emails/mo, $15/mo for 10K) and we just orchestrate. No per-contact pricing. A/B tests auto-route the rest of your list to the winner. Sequences mix email + SMS in one flow with TCPA quiet-hour enforcement.
OCCS
$0 from OCCS per email. You bring your own Postmark (free up to 3K/mo, $15/mo for 10K, $100/mo for 100K) or any SMTP. Your bill scales with what your provider charges, not OCCS.
Klaviyo
$45/mo at 1.5K contacts → $150/mo at 10K → $720/mo at 50K, regardless of how often you send.
Source: klaviyo.com/pricing (checked 2026-05-07; tiered by contact count) · postmark.com/pricing (checked 2026-05-21)
Monthly cost — by send volume
1K emails/mo
OCCS saves 100%
10K emails/mo
OCCS saves 90%
100K emails/mo
OCCS saves 93%
Assumes one send per month. Klaviyo's bill stays the same whether you send 0 or 30 campaigns to that list. OCCS itself adds $0 per send; the cyan series is Postmark's published BYO pricing (free tier covers 1K/mo). If you'd rather use SES, Mailgun, or any SMTP, plug it in instead — OCCS doesn't care which one.
Feature-by-feature
Honest comparison. Where Klaviyo ships the same capability we say so — the moat is in the rows where they don't.
| Feature | OCCS | Klaviyo |
|---|---|---|
| Drag-and-drop email composer | ||
| A/B subject + body tests | ||
| Auto-route winner to the rest of list | ||
| Sequences (multi-step drips) | ||
| Email + SMS in one sequence | ||
| TCPA quiet-hours enforcement | ||
| 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) | ||
| Pricing by send volume, not list size | — | |
| AI brand-voice draft generation built in | — | |
| Multi-channel campaigns (Meta, Google, TikTok, blog) under same brand spine | — | |
| Calendar view across email + social | — | |
| Inbound webhook capture (HMAC-signed) |
Bottom line
Klaviyo's price is a tax on having a list. OCCS doesn't charge per email at all — you pay Postmark (or any SMTP) directly at their wholesale rates. If your list grew but you only send a few campaigns a month, you're overpaying Klaviyo today.
Common questions
What about deliverability — does OCCS match Klaviyo on inbox placement?
Can I import my Klaviyo list?
What about flows / automations?
Ready to switch?
Free tier, no card required. Run OCCS in parallel with Klaviyo for 14 days — keep what works.