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Kern vs CallFirst

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 CallFirst
DetailKern logo KernCallFirst logo CallFirst
What it doesThe to-do app you share with your AI Screen time app that unlocks social media after a real phone call with someone you love
StageMVP Startup
FoundedNot given Not given
Based inNL GB
Pricing modelNot given Freemium
PricingNot given Free tier with one contact and daily unlock; paid tiers available with pricing varying by region and currency (from GBP 0 to GBP 59.99). Annual subscriptions and one-time purchases available.
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
  • Blocks Instagram, TikTok, YouTube, X, Threads, Facebook and Snapchat until 60-second phone call
  • On-device call verification without access to call logs or audio
  • Customizable blocking schedule with one-tap activation
  • Supports both regular phone calls and WhatsApp calls
  • Multiple contacts and named groups on Pro tier
  • Privacy-first design with no contact data synced to servers
  • Daily unlock system resetting each day
  • Free tier with one contact and one daily unlock
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
  • Designed for personal connection rather than productivity blocking
  • Call-based unlocking replaces generic friction like timers or breathing exercises
  • Verification happens locally on-device without server access to contact data
  • One simple mechanism designed for maximum behavioral impact
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 check3 no change since last check
Trust Flow (Majestic)00
Citation Flow (Majestic)1420
Referring domains (Majestic)318

5 details filled in for both companies.

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