How many companies use Customer.io vs SendGrid?

25 companies use Customer.io and 101,883 companies use SendGrid in our database. SendGrid is more widely adopted with 4075.3x more companies than Customer.io.

Can I get a list of companies using both Customer.io and SendGrid?

Yes. AgentData tracks companies using both tools. Sign up free to access the full list with emails, tech stacks, and contacts via CSV or API.

Customer.io vs SendGrid

SendGrid is used by 101,883companies — 4075.3x more than Customer.io (25).

25 use Customer.io101,883 use SendGrid

Side-by-side comparison

	Customer.io	SendGrid
Companies	25	101,883
Category	email_marketing	Other

Company adoption

Top companies using Customer.io

Hisachaka.com

Beefreebeefree.io

HVGinfo.hvg.hu

PharmacyOS - PillPackpharmacyos.com

urllolinks.urllo.com

Get the full comparison

101,908 companies with emails, tech stacks, and contacts

Start free →

1,000 lookups · API access · CSV exports

API access

GET /api/v1/tech?name=customer-io

From the makers of AgentData

DragApp

AI-powered shared inbox, help desk, and team collaboration — inside Gmail. 200K+ users.

Try DragApp free →

HeyHelp

AI email assistant inside Gmail. Drafts, sorts, follows up.

Try HeyHelp free →

Oneway

All-in-one customer platform — live chat, email, automations, changelogs & roadmaps with AI.

Try Oneway →

Related comparisons

Atlassian Jira vs Customer.ioCompare →Atlassian Jira vs SendGridCompare →Customer.io vs ExtJSCompare →ExtJS vs SendGridCompare →Customer.io vs List.jsCompare →List.js vs SendGridCompare →

View individually

Companies using Customer.io→

Companies using SendGrid→

Frequently asked questions

Need this data via API?

Access technology comparison data programmatically via REST API or MCP.

API docs →