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Kern vs RozVibe

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 RozVibe
DetailKern logo Kern RozVibe
What it doesThe to-do app you share with your AI Private encrypted journal and mood tracking app for Android
StageMVP Startup
FoundedNot given 2026
Based inNL Not given
Pricing modelNot given Free
PricingNot given Not given
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
  • AES-256-GCM client-side encryption
  • Mood tracking with 5 emotional states
  • Rich-text journaling editor
  • Secure cloud sync
  • Calendar view with mood markers
  • Local mood analytics and insights
  • 4-digit PIN sanctuary lock
  • No data mining or profiling
  • PBKDF2 key derivation with 100,000 rounds
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
  • Technically private through client-side encryption, not just a privacy promise
  • Encryption key never leaves your device or reaches servers
  • All analytics computed locally on your device
  • Never used to train AI models
  • Built by a solo developer for honest personal reflection
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)Not checked yet no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)00
Citation Flow (Majestic)140
Referring domains (Majestic)32

4 details filled in for both companies.

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