RazFit vs Substy AI
Side-by-side comparison to help you choose the right tool.
RazFit is an AI-powered personal trainer that delivers personalized, equipment-free bodyweight workouts with video guidance and progress tracking.
Last updated: March 18, 2026
Scale agency revenue. Automate chats, manage fans.
Visual Comparison
RazFit
Substy AI
Overview
About RazFit
RazFit is a sophisticated, native iOS fitness application engineered exclusively with SwiftUI for iPhone and iPad, requiring iOS 18 or later. It is a comprehensive fitness solution designed to deliver measurable physical transformation through high-intensity, bodyweight interval training (HIIT) protocols condensed into 1 to 10-minute daily sessions. The core value proposition is maximum efficiency: it eliminates the need for gym access, specialized equipment, or significant time commitments. The application is architected for a broad user demographic, from fitness novices seeking an accessible entry point to advanced athletes requiring a time-efficient maintenance or conditioning tool. Its technical foundation in SwiftUI ensures a fluid, responsive, and deeply integrated user experience that leverages the full performance capabilities of modern iOS hardware. Central to its functionality is an adaptive AI coaching system featuring two virtual trainers, Orion and Lyss, which conduct initial fitness assessments and dynamically modulate exercise difficulty and selection. This is complemented by a structured gamification layer comprising 32 unlockable achievement milestones, engineered to sustain user engagement over a longitudinal 52-week training cycle. Every prescribed exercise includes scalable modifications, allowing for precise user-controlled progression.
About Substy AI
Substy is the first platform to combine a full CRM and an autonomous AI chatbot in a single system built exclusively for OnlyFans and Fanvue agencies - and today it's the most widely adopted solution on the market.
The CRM is a complete agency workspace: add your chatters with custom access levels, let them chat directly from the platform, create and track tracking links (TikTok, Reddit, Telegram), classify fans automatically into Spenders, VIPs, Newbies, and Timewasters, and monitor every chatter's performance in real time - revenue, response rate, average basket.
The AI Chatbot runs 24/7 without human input. It sells PPV, handles objections, re-engages cold fans, and adapts its tone in any language - fully autonomous, not a co-pilot.
The hybrid mode is the game changer: AI handles fans below a spend threshold, human chatters take over only for VIPs. Agencies cut costs by 25% while automating 90% of messages.
Compatible with OnlyFans and Fanvue.