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Customer.io vs OneSignal

Side-by-side comparison of two indie startups from the Startup Spotlight directory.

Option A
Customer.io

Customer.io

Marketing

Send automated messages based on user behavior.

Customer.io is a behavior-based messaging platform — bootstrapped to significant scale before raising; founder-led roots.

Founded
2012
Team
51-200
Listing
Free (nofollow)
Listed
May 2026
View Customer.io →
Option B
OneSignal

OneSignal

Marketing

The market-leading customer engagement platform.

OneSignal provides push, in-app, email, and SMS messaging with generous free tier — widely used by indie mobile apps.

Founded
2014
Team
51-200
Listing
Free (nofollow)
Listed
May 2026
View OneSignal →

See more alternatives

Customer.io alternatives →OneSignal alternatives →