Resend vs Customer.io: which is cheaper?

Resend starts at $20/mo, while Customer.io starts at an unpublished tier. TrackRival snapshots both daily as plan pages change.

Does Resend or Customer.io have a free plan?

Resend shows a free plan in the latest snapshot, while Customer.io does not.

Is Resend a good email alternative to Customer.io?

Resend and Customer.io are both tracked in TrackRival's email category. Use the changelog section below to compare shipping cadence, not just headline pricing.

How often is this Resend vs Customer.io comparison updated?

TrackRival refreshes pricing snapshots daily and appends new changelog entries whenever either product ships a release.

Resend vs Customer.io

A side-by-side comparison of pricing, plans, and recent product updates. Pricing data last refreshed May 15, 2026.

Resend

Email for developers.

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Category: email
Plans tracked: 4
Entry price: $20/mo
Free plan?: Yes

See full Resend pricing & changelog →

Customer.io

Messaging automation for lifecycle and product email.

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Category: email
Plans tracked: —
Entry price: —
Free plan?: —

See full Customer.io pricing & changelog →

Plan-by-plan pricing

Resend

Free

Resend

Free

3,000 emails / mo
Sending & receiving
Ticket support
10,000 automation runs
30-day data retention
+ 1 more

Pro

Resend

$20/mo

50,000 emails / mo
Extra emails: $0.90 / 1,000
10 domains
100 AI credits / mo
No daily limit
+ 1 more

Scale

Resend

$90/mo

100,000 emails / mo
Extra emails: $0.90 / 1,000
Slack & ticket support
1,000 domains
500 AI credits / mo
+ 1 more

Enterprise

Resend

Custom

A plan based on your specific needs
Priority support
Flexible automation runs
Flexible data retention
Flexible domains
+ 1 more

Customer.io

Pricing data is being collected.