Email APIs · side by side
Klaviyo vs SMTP2GO
Compare Klaviyo, SMTP2GO 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
SMTP2GO
Klaviyo
Custom / not listed
Custom / unlisted usage pricing · 10K profiles
SMTP2GO
$0 / mo
Free · 0 emails
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 | SMTP2GO |
|---|---|---|
| Provider | Klaviyo | SMTP2GO |
| Billing unit | profiles | emails |
| Plan at selected usage | Custom / unlisted usage pricing | Free |
| Monthly estimate | Custom / not listed | $0/mo |
| Workload | 10K profiles | 0 emails |
| Free access | Limited free plan | 1,000 emails/month (capped at 200 emails/day), 5 days of reporting, ticket support, and no credit card required. |
| Published plans | Free | Free, Starter, Professional, Premier |
| Prices checked | 2026-10-08 | 2026-10-08 |
- Klaviyo
- Klaviyo
- SMTP2GO
- SMTP2GO
- Klaviyo
- profiles
- SMTP2GO
- emails
- Klaviyo
- Custom / unlisted usage pricing
- SMTP2GO
- Free
- Klaviyo
- Custom / not listed
- SMTP2GO
- $0/mo
- Klaviyo
- 10K profiles
- SMTP2GO
- 0 emails
- Klaviyo
- Limited free plan
- SMTP2GO
- 1,000 emails/month (capped at 200 emails/day), 5 days of reporting, ticket support, and no credit card required.
- Klaviyo
- Free
- SMTP2GO
- Free, Starter, Professional, Premier
- Klaviyo
- 2026-10-08
- SMTP2GO
- 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
SMTP2GO features & plan notes
- SMTP relay and RESTful API integration with global data centers
- Real-time analytics and tracking for delivery, opens, clicks, bounces, and spam complaints
- Email overage support allowing sending up to 3x plan limits on paid tiers
- Subaccount management and unlimited team members on all paid plans
- Dedicated IP included on Professional plans starting at 100,000 emails/month
- Up to 1,000 emails per month
- No credit card required
- Ticket support
- Toll-free phone and live chat support limited to 14 days
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