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REX vs ThunderPhone

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

REX compared with ThunderPhone
DetailREX logo REXThunderPhone logo ThunderPhone
What it doesA coding agent that runs your whole Windows PC by voice or text AI phone agents with integrated audio understanding, model routing, and voice optimization
StageNot given Not given
FoundedNot given Not given
Based inES US
Pricing modelFree Paid
PricingFree. Windows 10 or later, 64-bit. Cost-plus pricing: customers pay vendor list prices for models and voice plus hosting (15% of vendor costs, 0.5¢ to 2¢ per minute) plus company margin (17-25%). Lean calls cost from 2.0¢/min (1.18¢ vendors + 0.50¢ hosting + 0.35¢ margin). Receptionist calls cost 4.7¢/min (3.36¢ vendors + 0.50¢ hosti
Key features
  • Verifies results before completion
  • Voice and text input
  • Runs on Windows 10 or later, 64-bit
  • Compatible with any AI model you choose
  • Multi-step task automation
  • Checks live results in real applications
  • Multi-model architecture running multiple transcription and language models per call
  • Zeus AI agent that builds, tests and tunes voice agents automatically
  • Simulated call testing before live deployment
  • Live call monitoring and observability
  • A/B testing and automated fix suggestions
  • Integration wizard for CRM, VoIP and business software
  • Client portals for managing multiple agents
  • Knowledge base integration for agent grounding
  • Outbound campaigns with CSV upload and scheduling
What makes it different
  • Operates the entire Windows desktop, not just the terminal
  • Verifies task completion by checking real application results
  • Completely free with no subscription required
  • Voice control for hands-free operation
  • Measured performance on public benchmarks
  • Cost-plus pricing with no margin markup pass-through when vendor prices drop
  • Fully agentic Zeus AI that handles entire lifecycle from creation to optimization
  • Multi-model architecture for superior audio understanding vs 3-step pipelines
  • Starts at 2¢/min, cheaper than competitors and call center labor
Community votes00
DR (Domain Rating by Ahrefs)2 no change since last check43 +1 (up) since last check
Trust Flow (Majestic)25
Citation Flow (Majestic)2435
Referring domains (Majestic)15161

6 details filled in for both companies.

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