Kern vs ContactZapp

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Kern compared with ContactZapp
Detail	Kern	ContactZapp
What it does	The to-do app you share with your AI	Sync your contacts between Google, Microsoft, Apple and CardDAV. Find and merge duplicates easily.
Stage	MVP	Not given
Founded	Not given	Not given
Based in	NL	Not given
Pricing model	Not given	Freemium
Pricing	Not given	Free plan: 2 synced accounts, 100 contacts, no time limit. Easy plan: $4.00/month (billed $47.94/year, was $95.88). Unlimited plan: $8.00/month (billed $95.94/year, was $191.88). 50% off Easy and Unlimited with code HALLOWEEN.
Key features	Claude AI integration for reading and changing tasks Voice input to add or modify tasks AI-generated next steps with actionable buttons Research with sources Quick Entry on Mac to capture pages and emails Spaces and sections for organizing tasks Subtasks with progress tracking Repeating tasks Offline sync between iPhone and Mac Data export and deletion	Two-way sync across Google, Microsoft, Apple and CardDAV Merge duplicates in one go, or review them one by one Full change history with undo capability Backups and vCard export Sync frequency control (hourly, daily, or manual) Set accounts to read-only mode Preserve all phone numbers and email addresses Up to 5 encrypted account backups 12-month undo history Restore deleted contacts for 12 months
What makes it different	Chat with Claude inside individual tasks while still checking them off in the app Tasks automatically suggest next steps and provide one-tap actions Seamless Mac integration with window capture and menu bar control Never keeps window screenshots and no ads or tracking	Syncs across all major platforms in both directions automatically Encrypted contacts with privacy key per account Undo any change for up to 12 months No time limit on free plan Automatic duplicate detection and optional auto-merge
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	14	11
Referring domains (Majestic)	3	1

3 details filled in for both companies.

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