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Overage / Compare / Email APIs

Customer.io vs SMTP2GO pricing

Verified 2026-10-23 (2 days ago)Source: Customer.io: customer.io/pricing, SMTP2GO: www.smtp2go.com/pricing/Verified shows the older of the two.

Monthly cost at three volumes

Monthly cost of Customer.io and SMTP2GO at three volumes and at your own
VolumeCustomer.ioSMTP2GO
small5K emails sent$100 / moEssentials$15 / moStarter
growing50K emails sent$100 / moEssentials$63 / moStarter
scale500K emails sent$100 / moEssentials$415 / moProfessional
your volumeset above$100 / moEssentials$63 / 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 SMTP2GO aligned by position: free, entry, mid, top
PositionCustomer.ioSMTP2GO
Freeno tier$0 / moFree Plan · 1,000 emails sent / mo
Entry$100 / moEssentials · 1,000,000 emails sent / mo$15 / moStarter · 10,000 emails sent / mo
Mid$1,000 / moPremiumno tier
TopContact salesEnterprise$75 / moProfessional · 100,000 emails sent / mo

Tightest rate limit

Tightest documented rate limit of each service
MeasureCustomer.ioSMTP2GO
Tightest limitunlistedunlisted

Changes in the last 90 days

No changes recorded.

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