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Communications: SSO premium tracker

Name: The SSO Premium Index
Creator: Digital Signet
License: https://creativecommons.org/licenses/by/4.0/

Messaging, video, calling, email. 3 vendors tracked. Median SSO premium: +72%. Highest premium: Slack at +72%.

Vendor	Base	SSO	Δ%	Verified
Slack Pro → Business+	$7.25	$12.5	+72%	2026-06-02
Zoom Pro → Business	$13.32	$18.32	+38%	2026-06-02
Twilio Pay as you go → Enterprise Plan	$0	Enterprise (~$15K/yr min, industry-reported)	—	2026-06-02

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