Customer.io vs MailerSend pricing

Verified 2026-10-23 (2 days ago)Source: Customer.io: customer.io/pricing, MailerSend: www.mailersend.com/pricingVerified shows the older of the two.

Monthly cost at three volumes

Monthly cost of Customer.io and MailerSend at three volumes and at your own
Volume	Customer.io	MailerSend
small5K emails sent	$100 / moEssentials	$7 / moHobby
growing50K emails sent	$100 / moEssentials	$35 / moStarter
scale500K emails sent	$100 / moEssentials	$620 / moStarter
your volumeset above	$100 / moEssentials	$35 / moStarter

Each cell is the cheapest feasible plan, or the chosen model, at that volume, from the shared Overage cost function. "Cheapest model" only considers models with both an input and an output price listed. Volumes are example scenarios you can edit.

Tiers, aligned by position

Tiers of Customer.io and MailerSend aligned by position: free, entry, mid, top
Position	Customer.io	MailerSend
Free	no tier	$0 / moFree · 500 emails sent / mo
Entry	$100 / moEssentials · 1,000,000 emails sent / mo	$110 / moProfessional · 50,000 emails sent / mo
Mid	$1,000 / moPremium	$35 / moStarter · 50,000 emails sent / mo
Top	Contact salesEnterprise	$0 onceFree Trial (14 days) · 500 emails sent / mo

Tightest rate limit

Tightest documented rate limit of each service
Measure	Customer.io	MailerSend
Tightest limit	unlisted	100 api requests per dayFree tier

Changes in the last 90 days

No changes recorded.

No change detected for either service in the last 90 days.