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WhittleOS vs GroundUI

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

WhittleOS compared with GroundUI
DetailWhittleOS logo WhittleOSGroundUI logo GroundUI
What it doesA startup decision engine for solo founders that kills weak ideas before they waste your months Real mobile app screens with source code for AI coding agents
StageNot given Not given
FoundedNot given Not given
Based inNot given IN
Pricing modelPaid Freemium
PricingStarter: $19 (2 credits); Founder Discovery Pass: $49 (6 credits); Multi-Market: $99 (15 credits); Working Founder: $149 (30 credits). Credits never expire. New accounts receive 2 free credits for any run except Discovery. Free: browse library and agent briefs. Pro: $9/month billed yearly ($108/year) or $15/month, includes source code in four frameworks and MCP server. Lifetime: $199 one-time payment, includes everything in Pro plus GitHub repository access and all future updates.
Key features
  • 12 deal-breaker checks for evaluating ideas
  • Market discovery with live searches across real sources
  • Whittle Score ranked 0–100 from fixed rubric computed in code
  • Build it / Test it first / Drop it verdict with reasons
  • Evidence linked to source pages or marked not verified
  • Up to 5 ranked idea candidates per Discovery run
  • Deep-dive modules: Kill My Idea, Pricing Power, Support Burden, Platform Risk, Pivot Wedge
  • Prepaid credits with no expiration
  • Free founder profile read and 2 free credits on signup
  • Async-only validation with no customer calls required
  • Source code in SwiftUI, Flutter, React Native and Kotlin
  • Editable source code that lives in your repository
  • Website blocks for React and Tailwind coming soon
What makes it different
  • No subscription or sales calls—pay per decision with credits that never expire
  • Code lives in your repository with no package dependencies or lock-in
  • One-time Lifetime payment option as alternative to monthly subscription
Community votes00
DR (Domain Rating by Ahrefs)4 +1 (up) since last check4 +1 (up) since last check
Trust Flow (Majestic)180
Citation Flow (Majestic)240
Referring domains (Majestic)510

5 details filled in for both companies.

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