What is the best free alternative to Customer.io?

Resend is the highest-rated free alternative to Customer.io. It offers developers who need a modern email api with excellent dx for transactional and marketing email. and has a 4.5 star rating from 89 reviews.

Why do people look for Customer.io alternatives?

Common reasons include: $100/mo minimum requires serious email ROI to justify. Requires technical knowledge to implement fully. Customer.io is small businesses or non-technical teams — the complexity and price require dedicated resources..

Is Customer.io the best email marketing tool?

Based on our review, Customer.io is situational for technical teams building data-driven, multi-channel messaging at scale.. However, Resend may be better for developers who need a modern email api with excellent dx for transactional and marketing email..

What is cheaper than Customer.io?

Omnisend starts at $16/mo compared to Customer.io at $100/mo (Essentials, 5K profiles). It has a 4.3 rating and is best for e-commerce stores wanting email + sms automation.

Best Customer.io Alternatives 2026: 8 Reviewed

Best Customer.io Alternatives 2026: 8 Reviewed | AICores · AICores

Customer.io vs Top Alternatives

	Customer.io	Resend	Beehiiv	ActiveCampaign
Price	$100/mo (Essentials, 5K profiles)	$20/mo (Pro, 50K emails)	$49/mo (Scale)	$15/mo (Starter, 1K contacts)
Free Tier	✓	✓	✓	✓
Rating	★ 4.3	★ 4.5	★ 4.4	★ 4.4
Verdict	Situational	Recommended	Recommended	Recommended
API	✓	✓	✓	✓

Best Customer.io Alternatives in 2026

Why Look for Customer.io Alternatives?

Top 8 Alternatives to Customer.io

Resend — Best Email Marketing Alternative for Developers who need a modern email API w

Beehiiv — Best Email Marketing Alternative for Newsletter operators building a media bu

ActiveCampaign — Best Email Marketing Alternative for Marketing teams needing complex automati

Customer.io vs Top Alternatives

Frequently Asked Questions

Related Comparisons

Still not sure which to pick?