Brevo (formerly Sendinblue) vs Customer.io

Customer.io has a Proven Score of 73/100 (Established). Brevo (formerly Sendinblue) has a Proven Score of 66/100 (Established). Customer.io ranks higher in Marketing automation & email. Both are in Marketing automation & email on the Proven Trust Index. Vendors cannot pay to change a score. Scores can't be bought.

Score inputs

Input	Brevo (formerly Sendinblue)	Customer.io
Proven marketplaces	10.3 / 15	13.2 / 15
Member redemption clicks	7.5 / 15	15 / 15
Client quality	20 / 20	20 / 20
Operating tenure	9.3 / 10	9.3 / 10
Market standing	6 / 10	0 / 10
Connected relationships	2.9 / 10	4.5 / 10
Connected data	0 / 5	0 / 5

Best for

Shared

Use case: Marketing automation & email

Different

Stage — Brevo (formerly Sendinblue): Debt Financing; Customer.io: Series A
Team size — Brevo (formerly Sendinblue): 1,000 employees; Customer.io: 420 employees
Region — Brevo (formerly Sendinblue): Paris, France; Customer.io: Portland, United States

Pages

Brevo (formerly Sendinblue) · Customer.io · Best Marketing automation & email for startups, ranked by the Proven Trust Index

Data updated 2026-10-27.

Source: Proven platform data, public records and vendor websites. Vendors cannot pay to change a score. Scores can't be bought. Data updated 2026-10-27. About the data · Proven