How many companies use Microsoft 365 vs SmtpJS?

4,321,946 companies use Microsoft 365 and 647 companies use SmtpJS in our database. Microsoft 365 is more widely adopted with 6680.0x more companies than SmtpJS.

Can I get a list of companies using both Microsoft 365 and SmtpJS?

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.

Microsoft 365 vs SmtpJS

Microsoft 365 is used by 4,321,946companies — 6680.0x more than SmtpJS (647).

4,321,946 use Microsoft 365647 use SmtpJS

Side-by-side comparison

	Microsoft 365	SmtpJS
Companies	4,321,946	647
Category	Webmail	Email

Company adoption

Get the full comparison

4,322,593 companies with emails, tech stacks, and contacts

Start free →

1,000 lookups · API access · CSV exports

API access

GET /api/v1/tech?name=microsoft-365

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 →

View individually

Companies using Microsoft 365→

Companies using SmtpJS→

Frequently asked questions

Need this data via API?

Access technology comparison data programmatically via REST API or MCP.

API docs →