Email APIs · side by side
Klaviyo vs Omnisend
Compare Klaviyo, Omnisend 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
Omnisend
Klaviyo
Custom / not listed
Custom / unlisted usage pricing · 10K profiles
Omnisend
$0 / mo
Free · 0 contacts
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 | Omnisend |
|---|---|---|
| Provider | Klaviyo | Omnisend |
| Billing unit | profiles | contacts |
| Plan at selected usage | Custom / unlisted usage pricing | Free |
| Monthly estimate | Custom / not listed | $0/mo |
| Workload | 10K profiles | 0 contacts |
| Free access | Limited free plan | Free for up to 250 contacts and 500 emails/month with access to core automations, templates, and signup forms. |
| Published plans | Free | Free, Standard, Pro, Custom |
| Prices checked | 2026-10-08 | 2026-10-08 |
- Klaviyo
- Klaviyo
- Omnisend
- Omnisend
- Klaviyo
- profiles
- Omnisend
- contacts
- Klaviyo
- Custom / unlisted usage pricing
- Omnisend
- Free
- Klaviyo
- Custom / not listed
- Omnisend
- $0/mo
- Klaviyo
- 10K profiles
- Omnisend
- 0 contacts
- Klaviyo
- Limited free plan
- Omnisend
- Free for up to 250 contacts and 500 emails/month with access to core automations, templates, and signup forms.
- Klaviyo
- Free
- Omnisend
- Free, Standard, Pro, Custom
- Klaviyo
- 2026-10-08
- Omnisend
- 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.
Email APIs feature comparison
| Email APIs | Klaviyo | Omnisend |
|---|---|---|
| Email sends per month | Not listed | 500 |
| Web push notifications | Not listed | 500 |
| Custom Events | Not listed | Unlimited |
| Omnisend Branding (Newsletters) | Not listed | Required |
| Segmentation | Not listed | Unlimited |
| Web Tracking Data History | Not listed | Unlimited |
| Omnisend Branding (Signup forms) | Not listed | Required |
| Number of Active Signup Forms | Not listed | Unlimited |
| Number of Additional Fields | Not listed | Unlimited |
- Klaviyo
- Not listed
- Omnisend
- 500
- Klaviyo
- Not listed
- Omnisend
- 500
- Klaviyo
- Not listed
- Omnisend
- Unlimited
- Klaviyo
- Not listed
- Omnisend
- Required
- Klaviyo
- Not listed
- Omnisend
- Unlimited
- Klaviyo
- Not listed
- Omnisend
- Unlimited
- Klaviyo
- Not listed
- Omnisend
- Required
- Klaviyo
- Not listed
- Omnisend
- Unlimited
- Klaviyo
- Not listed
- Omnisend
- Unlimited
Which email providers fit your needs?
Klaviyo features & plan notes
- E-commerce data
- Omnichannel
- Shopify ecosystem
Omnisend features & plan notes
- Ecommerce-tailored automations for cart abandonment, order confirmations, and win-back flows
- Multi-channel support including email, SMS, and web push notifications
- Extensive REST API for managing contacts, custom events, orders, and campaigns
- Dynamic product recommendation and discount code content blocks
- 500 monthly emails
- 250 contacts
- 500 Web Push notifications
- Free migration
- 24/7 support
- Omnisend MCP
- Account expert (from $400)
- No Omnisend branding
- Advanced reporting
- Dynamic content
- Personalized product recommender AI
- Personalized sending time
- Forms AI
- Reports AI
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