Email APIs · side by side
Instantly vs Klaviyo
Compare Instantly, Klaviyo 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.
Instantly
Klaviyo
Instantly
Custom / not listed
Custom / unlisted usage pricing · 10K leads
Klaviyo
Custom / not listed
Custom / unlisted usage pricing · 10K profiles
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 | Instantly | Klaviyo |
|---|---|---|
| Provider | Instantly | Klaviyo |
| Billing unit | leads | profiles |
| Plan at selected usage | Custom / unlisted usage pricing | Custom / unlisted usage pricing |
| Monthly estimate | Custom / not listed | Custom / not listed |
| Workload | 10K leads | 10K profiles |
| Free access | Trial | Limited free plan |
| Published plans | Bundle - Starter (Monthly), Bundle - Starter (Yearly), Bundle - Scale (Monthly), Bundle - Scale (Yearly), Bundle - Agency (Monthly), Bundle - Agency (Yearly), Outreach - Growth (Monthly), Outreach - Growth (Yearly), Outreach - Hypergrowth (Monthly), Outreach - Hypergrowth (Yearly), Outreach - Light Speed (Monthly), Outreach - Light Speed (Yearly) | Free |
| Prices checked | 2026-10-08 | 2026-10-08 |
- Instantly
- Instantly
- Klaviyo
- Klaviyo
- Instantly
- leads
- Klaviyo
- profiles
- Instantly
- Custom / unlisted usage pricing
- Klaviyo
- Custom / unlisted usage pricing
- Instantly
- Custom / not listed
- Klaviyo
- Custom / not listed
- Instantly
- 10K leads
- Klaviyo
- 10K profiles
- Instantly
- Trial
- Klaviyo
- Limited free plan
- Instantly
- Bundle - Starter (Monthly), Bundle - Starter (Yearly), Bundle - Scale (Monthly), Bundle - Scale (Yearly), Bundle - Agency (Monthly), Bundle - Agency (Yearly), Outreach - Growth (Monthly), Outreach - Growth (Yearly), Outreach - Hypergrowth (Monthly), Outreach - Hypergrowth (Yearly), Outreach - Light Speed (Monthly), Outreach - Light Speed (Yearly)
- Klaviyo
- Free
- Instantly
- 2026-10-08
- Klaviyo
- 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
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