Whisperstream vs ContactZapp

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

Whisperstream compared with ContactZapp
Detail	Whisperstream	ContactZapp
What it does	On-device dictation for Windows with no cloud transcription	Sync your contacts between Google, Microsoft, Apple and CardDAV. Find and merge duplicates easily.
Stage	Not given	Not given
Founded	Not given	Not given
Based in	CA	Not given
Pricing model	Not given	Freemium
Pricing	$29 for 1 device, $49 for up to 2 devices. One-time payment, no subscription.	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	On-device speech recognition using NVIDIA Parakeet model Text delivery to compatible applications via clipboard or simulated keystrokes Searchable transcript history with audio replay and encryption Import and transcribe audio files locally Support for 39 languages including English, Spanish, French, German, Chinese, and Japanese Optional AI cleanup to remove filler words and fix grammar Custom dictionary for names, technical terms, and acronyms Works entirely on CPU without requiring GPU for core transcription	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	Works offline after initial setup with no internet connection needed for core transcription Broad app compatibility without requiring add-ins or plugins Runs on CPU with no GPU required for speech recognition	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)	17 +1 (up) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	17	0
Citation Flow (Majestic)	29	11
Referring domains (Majestic)	78	1

4 details filled in for both companies.

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