How do Klaviyo and Plunk prices compare?

Klaviyo: custom or unlisted usage pricing at 10,000 profiles. Plunk: custom or unlisted usage pricing at 100,000 emails. Different billing units are not an equal-workload comparison. Estimates exclude unlisted add-ons and taxes.

What matters for transactional email?

Review SMTP or API integration, domain authentication, bounce and complaint events, suppression handling and delivery-log retention.

Can I compare marketing and agent email by sends?

Only when the published plan actually bills by sends. Contacts, subscribers and inboxes stay in their own billing units.

What features and free access does Klaviyo list?

E-commerce data, Omnichannel, Shopify ecosystem. Free access: Limited free plan. Check plan-specific availability and current terms on the provider's official pricing page.

What features and free access does Plunk list?

Open source, Simple API, AWS SES infrastructure. Free access: Developer free allowance. Check plan-specific availability and current terms on the provider's official pricing page.

Email APIs · side by side

Klaviyo vs Plunk

Compare Klaviyo, Plunk 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

Number of profiles

10K

Plunk

Monthly emails

100K

Klaviyo

Custom / not listed

Custom / unlisted usage pricing · 10K profiles

Plunk

Custom / not listed

No priced plan for this volume · 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	Plunk
Provider	Klaviyo	Plunk
Billing unit	profiles	emails
Plan at selected usage	Custom / unlisted usage pricing	No priced plan for this volume
Monthly estimate	Custom / not listed	Custom / not listed
Workload	10K profiles	100K emails
Free access	Limited free plan	Developer free allowance
Published plans	Free	Pay as you grow, Free forever
Prices checked	2026-10-08	2026-10-08

Provider

Klaviyo: Klaviyo
Plunk: Plunk

Billing unit

Klaviyo: profiles
Plunk: emails

Plan at selected usage

Klaviyo: Custom / unlisted usage pricing
Plunk: No priced plan for this volume

Monthly estimate

Klaviyo: Custom / not listed
Plunk: Custom / not listed

Workload

Klaviyo: 10K profiles
Plunk: 100K emails

Free access

Klaviyo: Limited free plan
Plunk: Developer free allowance

Published plans

Klaviyo: Free
Plunk: Pay as you grow, Free forever

Prices checked

Klaviyo: 2026-10-08
Plunk: 2026-10-08

Email APIs monthly cost

Klaviyo: Not pricedPlunk: Not priced

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

Full pricing Official Pricing

Plunk features & plan notes

Open source
Simple API
AWS SES infrastructure

Full pricing Official Pricing

How to compare email providers

Browse Email APIs pricing

Klaviyo vs Plunk — FAQ

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