Email APIs · side by side
Klaviyo vs Mailtrap
Compare Klaviyo, Mailtrap 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
Mailtrap
Klaviyo
Custom / not listed
Custom / unlisted usage pricing · 10K profiles
Mailtrap
$85 / mo
Email API/SMTP - Business · 100K 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 | Mailtrap |
|---|---|---|
| Provider | Klaviyo | Railsware |
| Billing unit | profiles | emails |
| Plan at selected usage | Custom / unlisted usage pricing | Email API/SMTP - Business |
| Monthly estimate | Custom / not listed | $85/mo |
| Workload | 10K profiles | 100K emails |
| Free access | Limited free plan | Limited free plan |
| Published plans | Free | Email API/SMTP - Free, Email Sandbox - Free, Email Marketing - Free, Email API/SMTP - Basic, Email Marketing - Essential, Email Sandbox - Basic, Email Sandbox - Team, Email Marketing - Pro, Email API/SMTP - Business, Email Sandbox - Business, Email Sandbox - Enterprise, Email API/SMTP - Enterprise |
| Prices checked | 2026-10-08 | 2026-10-08 |
- Klaviyo
- Klaviyo
- Mailtrap
- Railsware
- Klaviyo
- profiles
- Mailtrap
- emails
- Klaviyo
- Custom / unlisted usage pricing
- Mailtrap
- Email API/SMTP - Business
- Klaviyo
- Custom / not listed
- Mailtrap
- $85/mo
- Klaviyo
- 10K profiles
- Mailtrap
- 100K emails
- Klaviyo
- Limited free plan
- Mailtrap
- Limited free plan
- Klaviyo
- Free
- Mailtrap
- Email API/SMTP - Free, Email Sandbox - Free, Email Marketing - Free, Email API/SMTP - Basic, Email Marketing - Essential, Email Sandbox - Basic, Email Sandbox - Team, Email Marketing - Pro, Email API/SMTP - Business, Email Sandbox - Business, Email Sandbox - Enterprise, Email API/SMTP - Enterprise
- Klaviyo
- 2026-10-08
- Mailtrap
- 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
Mailtrap features & plan notes
- Email sandbox
- Sending API
- Detailed logs
- 100,000 emails ($85/mo), 250,000 emails ($200/mo), 500,000 emails ($300/mo), or 750,000 emails ($450/mo)
- 100 users
- 15 days of email logs
- 100 domains
- Dedicated IP
- Extra emails: $0,88 per 1,000
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