Bird (SparkPost) vs Customer.io pricing

Verified 2026-10-24 (1 day ago)Source: Bird (SparkPost): bird.com/en-us/pricing/email, Customer.io: customer.io/pricingVerified shows the older of the two.

Monthly cost at three volumes

Monthly cost of Bird (SparkPost) and Customer.io at three volumes and at your own
Volume	Bird (SparkPost)	Customer.io
small5K emails sent	$17 / moStartup (prepaid deposit)	$100 / moEssentials
growing50K emails sent	$35 / moStartup (prepaid deposit)	$100 / moEssentials
scale500K emails sent	$215 / moStartup (prepaid deposit)	$100 / moEssentials
your volumeset above	$35 / moStartup (prepaid deposit)	$100 / moEssentials

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 Bird (SparkPost) and Customer.io aligned by position: free, entry, mid, top
Position	Bird (SparkPost)	Customer.io
Free	$0 / moFree · 1,000 emails sent / mo	no tier
Entry	$15 / moStartup (prepaid deposit)	$100 / moEssentials · 1,000,000 emails sent / mo
Mid	$250 / moGrowth (prepaid deposit)	$1,000 / moPremium
Top	$1,000 / moScale (prepaid deposit)	Contact salesEnterprise

Tightest rate limit

Tightest documented rate limit of each service
Measure	Bird (SparkPost)	Customer.io
Tightest limit	50 emails sent per dayFree tier	unlisted

Changes in the last 90 days

No changes recorded.

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