ContactZapp vs Systune

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 Systune
Detail	ContactZapp	Systune
What it does	Sync your contacts between Google, Microsoft, Apple and CardDAV. Find and merge duplicates easily.	Clean your Mac without the guesswork
Stage	Not given	MVP
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.	US$39 once for three Macs in one household with two years of updates (direct). Mac App Store edition planned at US$39 once with final pricing to follow App Store tiers. First 100 waitlist signups receive free lifetime license including all future versions. 14-day full trial and 30-day refund planned
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	103 cleaning categories with four risk levels 92 security and privacy checks with one-click fixes 300 macOS settings with profiles, snapshots and undo Disk analysis with list, treemap, ring and file-kind views Duplicate and large-file finder Command-line interface with JSON output Full-screen terminal dashboard iPhone companion over local network 67 maintenance tasks including rebuilds and service restarts Startup item and launch daemon inspector
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	All changes listed and confirmed before removal with a test strip showing exact paths and bytes Protected system paths refused and user files offered to Trash with regenerable caches deleted in place Five rounds of independent security, correctness and performance review with published findings Local processing with no analytics, crash reporting or scan result uploads
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	11 +1 (up) since last check
Trust Flow (Majestic)	0	7
Citation Flow (Majestic)	11	20
Referring domains (Majestic)	1	17

4 details filled in for both companies.

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