Email APIs · side by side
Klaviyo vs Shipmail
Compare Klaviyo, Shipmail by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
These providers bill in different units. Each estimate uses its own workload; there is no same-volume price winner.
Klaviyo
Shipmail
Klaviyo
Custom / not listed
Custom / unlisted usage pricing · 10K profiles
Shipmail
$4.00 / mo
Solo · 0 mailboxes
Listed USD plan fees and tracked usage only. Unlisted compute, transfer, extras, taxes and contract terms are excluded. Custom or unsupported plan usage is not estimated.
Email APIs overview & pricing
| Email APIs | Klaviyo | Shipmail |
|---|---|---|
| Provider | Klaviyo | Shipmail |
| Billing unit | profiles | mailboxes |
| Plan at selected usage | Custom / unlisted usage pricing | Solo |
| Monthly estimate | Custom / not listed | $4.00/mo |
| Workload | 10K profiles | 0 mailboxes |
| Free access | Limited free plan | None (14-day free trial, credit card required) |
| Published plans | Free | Solo, Pro, Team, Scale, Scale (300+ mailboxes) |
| Prices checked | 2026-10-08 | 2026-10-08 |
- Klaviyo
- Klaviyo
- Shipmail
- Shipmail
- Klaviyo
- profiles
- Shipmail
- mailboxes
- Klaviyo
- Custom / unlisted usage pricing
- Shipmail
- Solo
- Klaviyo
- Custom / not listed
- Shipmail
- $4.00/mo
- Klaviyo
- 10K profiles
- Shipmail
- 0 mailboxes
- Klaviyo
- Limited free plan
- Shipmail
- None (14-day free trial, credit card required)
- Klaviyo
- Free
- Shipmail
- Solo, Pro, Team, Scale, Scale (300+ mailboxes)
- Klaviyo
- 2026-10-08
- Shipmail
- 2026-10-08
Email APIs monthly cost
Different workloads, separate estimates
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Which email providers fit your needs?
Klaviyo features & plan notes
- E-commerce data
- Omnichannel
- Shopify ecosystem
Shipmail features & plan notes
- Custom-domain email with webmail, IMAP, SMTP, and JMAP support
- REST API, webhooks, and MCP server for AI agent integration
- Shared inboxes, calendars, contact management, and booking features
- 15–25 GB of storage per mailbox
- 2 mailboxes total, across your domains
- 15 GB storage per mailbox
- 1 team member
- 20,000 email sends/month
- 1,000 newsletter sends/month
- 500 active newsletter subscribers
How to compare email providers
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Browse Email APIs pricing