ContactZapp vs Diurnal

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

ContactZapp compared with Diurnal
Detail	ContactZapp	Diurnal
What it does	Sync your contacts between Google, Microsoft, Apple and CardDAV. Find and merge duplicates easily.	A native Mac notepad where everything you write becomes a task, with automatic tidying
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Not given
Pricing	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.	Not given
Key features	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	Write tasks inline as natural paragraphs No required dates for tasks Automatic task archiving Project management with deadlines Google Calendar integration Voice capture Focus mode with Pomodoro timer AI assistant integration via MCP Offline sync across all Macs Drag-and-drop task planning
What makes it different	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	Automatic tidying eliminates manual maintenance No overdue piles or red tasks Native Mac performance built for one platform Works offline without syncing delays Combines notepad freedom with task structure
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	7 +1 (up) since last check
Trust Flow (Majestic)	0	3
Citation Flow (Majestic)	11	24
Referring domains (Majestic)	1	23

3 details filled in for both companies.

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