Email APIs · side by side
Klaviyo vs Mailshake
Compare Klaviyo, Mailshake 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
Mailshake
Klaviyo
Custom / not listed
Custom / unlisted usage pricing · 10K profiles
Mailshake
$29 / mo
Starter · 0 user
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 | Mailshake |
|---|---|---|
| Provider | Klaviyo | Mailshake |
| Billing unit | profiles | user |
| Plan at selected usage | Custom / unlisted usage pricing | Starter |
| Monthly estimate | Custom / not listed | $29/mo |
| Workload | 10K profiles | 0 user |
| Free access | Limited free plan | None |
| Published plans | Free | Starter, Email Outreach, Sales Engagement, Agency Plan |
| Prices checked | 2026-10-08 | 2026-10-08 |
- Klaviyo
- Klaviyo
- Mailshake
- Mailshake
- Klaviyo
- profiles
- Mailshake
- user
- Klaviyo
- Custom / unlisted usage pricing
- Mailshake
- Starter
- Klaviyo
- Custom / not listed
- Mailshake
- $29/mo
- Klaviyo
- 10K profiles
- Mailshake
- 0 user
- Klaviyo
- Limited free plan
- Mailshake
- None
- Klaviyo
- Free
- Mailshake
- Starter, Email Outreach, Sales Engagement, Agency Plan
- Klaviyo
- 2026-10-08
- Mailshake
- 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
Mailshake features & plan notes
- Automated cold email sequencing with personalized follow-ups
- Unlimited email warmup and automated email verification
- AI email writing assistant and campaign A/B testing
- CRM integrations with Salesforce, HubSpot, and Pipedrive
- 1 email address per account
- 1,500 email sends per month
- UNLIMITED uploaded contacts
- 50 free data finder credits
- UNLIMITED email warmup
- UNLIMITED campaigns per month
- UNLIMITED email verification
- Mail accounts from any provider
- Automated email sequences
- A/B Testing
- AI email writing with SHAKESpeare
- Auto-generate email copy in under a minute
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