How many companies use klaviyo vs List.js?

543 companies use klaviyo and 20,828 companies use List.js in our database. List.js is more widely adopted with 38.4x more companies than klaviyo.

Can I get a list of companies using both klaviyo and List.js?

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

List.js is used by 20,828companies — 38.4x more than klaviyo (543).

543 use klaviyo20,828 use List.js

	klaviyo	List.js
Companies	543	20,828
Category	email_marketing	Hosting

Get the full comparison

21,371 companies with emails, tech stacks, and contacts

1,000 lookups · API access · CSV exports

API access

GET /api/v1/tech?name=klaviyo

AgentData picks

Oneway

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

DragApp

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

Access technology comparison data programmatically via REST API or MCP.