What is the best alternative to IIS?

Based on company usage data, Nginx is the most widely adopted alternative, detected on 122,621 websites.

How many companies use IIS?

AgentData detects IIS on 10,415 company websites as of September 2026.

Are companies switching away from IIS?

AgentData tracks technology changes across company websites. Check back for switching trends as we detect more changes.

IIS alternatives

Ranked by real company usage

The most popular alternatives to IIS based on AgentData's analysis of 10,415 company websites are Nginx (122,621 companies), Apache HTTP Server (106,627 companies), LiteSpeed (34,641 companies).

IIS: 10,415 companiesCategory: Web servers15 alternatives found

Top alternatives to IIS

122,621 companies

106,627 companies

34,641 companies

6,562 companies

1,795 companies

893 companies

664 companies

626 companies

448 companies

#10

413 companies

#11

377 companies

#12

268 companies

#13

Apache Traffic Server

228 companies

#14

191 companies

#15

138 companies

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10,415 companies with emails, tech stacks, and contacts

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1,000 lookups · API access · CSV exports

API access

GET /api/v1/tech?name=iis

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Compare

IIS vs NginxCompare →IIS vs Apache HTTP ServerCompare →IIS vs LiteSpeedCompare →IIS vs OpenRestyCompare →

Companies using IIS→

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