How many companies use Constant Contact vs Klaviyo?

16,794 companies use Constant Contact and 65,754 companies use Klaviyo in our database. Klaviyo is more widely adopted with 3.9x more companies than Constant Contact.

Can I get a list of companies using both Constant Contact and Klaviyo?

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.

Constant Contact vs Klaviyo

Klaviyo is used by 65,754companies — 3.9x more than Constant Contact (16,794).

16,794 use Constant Contact65,754 use Klaviyo

Side-by-side comparison

	Constant Contact	Klaviyo
Companies	16,794	65,754
Category	Marketing automation	Marketing automation

Company adoption

Top companies using Klaviyo

Roderer Shoe Centerroderershoecenter.com

Ronnies Catering & BBQronniebbq.com

RockShoprockshopjewelry.com

ALEXISTOGELredbudmanorinn.com

RoJenrojen.com

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82,548 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=constant-contact

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