Opensense vs. Xink

The Opensense difference

WARNING: Xink does not seem to have either an ISO27001 or a SOC2 certification of their own. They mention Microsoft Azure has an ISO27001 which does not imply Xink does.
You'll find some key differences between Opensense and Xink in the comparison matrix below. Notably, Opensense has pre-built integrations with industry leading CRM and Marketing Automation tools for dynamically updating signature messaging and/or campaign banners to recipients based on segmentation
Xink has a handful of different solutions that span server side re-routing, email client plugins and API-based access.

Key Features
SOC2 Compliant
US Headquarters & Support
Gmail Web Central Update
Gmail Mobile Central Update
Apple Mail Central Update
iPhone Mail Central Update
Android Mail Central Update
Real-time Compliance Audit
Natural Language Search
Real-time Conditional attributes		unknown
Departmental Signatures
Internal Recipient Targeting		unknown
External Recipient Targeting		unknown
Rapid Parallel Push (Gmail)		unknown
SalesforceIQ Template Update
Salesforce ABM
Salesforce Signature Support		not AppExchange approved
Salesforce AppExchange Portal
Cirrus Insight Templates
Marketo/Eloqua/HubSpot/Pardot		unknown
Whitepaper Analytics
YouTube/Vimeo Analytics
White labeled URLs
Encrypted White Labeled URLs
Outlook Support		requires plugin
Auto Lead Capturing		limited
Banner Ads
Text Ads

To see a list of other competitors, please see this post about the email signatures landscape.
Xink's website