SubZero Gym

SubZero Gym

Your AI Personal Trainer

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Free
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Features

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About

SubZero Gym is a complete fitness platform that puts a personal trainer in your pocket. Generate AI-powered workout plans, track every rep, monitor your recovery, and crush your goals — whether you train at a full gym, at home with dumbbells, or anywhere in between. PICK YOUR AI, BUILD YOUR PLAN Choose from 7 AI providers — Claude, GPT, Gemini, Grok, DeepSeek, Groq, or Perplexity — and 15 models. Generate 2 to 12-week progressive programs with periodization: Foundation, Build, Peak, and Deload phases. Plans adapt to your equipment (65+ types), schedule, and goals. Got injured? Changed your schedule? AI regenerates your plan while preserving progress. YETI: YOUR ON-DEVICE AI (Basic and above) Yeti runs locally on your iPhone — no internet required, instant responses. Workout Control (98 Commands): "Skip bench press." "My shoulder hurts." "Go lighter." "Swap to dumbbells." "Only have 30 minutes." "Add a set." Coaching: "How do I do this exercise?" — form tips, muscles, technique. "Should I train today?" — checks readiness. "Am I plateauing?" — analyzes progress. Schedule: "Swap today with tomorrow." "Skip today." "I need rest." AI Generation: Post-workout summaries with coaching tips. Weekly insights with volume trends. Personalized warm-ups based on today's workout. (Pro and above) SMART FEATURES (Pro and above) • Smart weight suggestions from your history • Readiness score from sleep, HRV, and resting heart rate • Plateau detection with intervention strategies • Effort PR detection — same weight at lower RIR = strength gain • Mid-workout fatigue detection with weight adjustment suggestions All local. Your data never leaves your device. TRAIN YOUR WAY • iPhone only — workout logging, rest timer, PR detection, Live Activity • iPhone + Apple Watch — real-time HR, voice announcements, haptic feedback • Log on iPhone while Apple Fitness tracks HR on Watch — data merges automatically • Apple Watch standalone — complete workouts from your wrist TRACK EVERYTHING • 8 PR types: max weight, reps, volume, 1RM, effort PRs, distance, pace, duration • RIR tracking with intensity analysis • Muscle recovery heat map — 13 muscle groups, tap for details • Volume trends, frequency charts, complete workout history BODY COMPOSITION • Weight tracking with smart scale sync and trend charts • 12 body measurements with progress indicators • Encrypted progress photos — AES-256, Face ID required, stays on device NUTRITION & SUPPLEMENTS (Pro and above) • AI supplement stacks with research citations from PubMed • Three tiers: Essential, Beneficial, Optional with daily timing • Sync from MyFitnessPal, Cronometer, or any HealthKit app • Macro tracking with AI-personalized targets 54 ACHIEVEMENTS, 9 CATEGORIES Bronze through Diamond tiers. Workouts, volume, streaks, PRs, cardio, consistency, nutrition. Full-screen unlock celebrations. Shareable achievement cards. APPLE ECOSYSTEM • 8 Home Screen + 5 Lock Screen widgets • Live Activity & Dynamic Island during workouts • 4 Control Center controls • 7 Siri Shortcuts • WorkoutKit sync to Apple Fitness • Focus Filters for notification control • Apple Journal integration • iCloud sync across devices (Pro+ and above) • Family Sharing up to 6 members (Pro+/Elite+) 550+ EXERCISES. 65+ EQUIPMENT TYPES. Full gym, home gym, hotel gym, bodyweight only — SubZero adapts to what you have. PRIVACY FIRST All data stored locally. No ads. No third-party analytics. Progress photos encrypted. AI requests processed but never stored. 6 TIERS • Free: Core tracking, 1 plan/month • Basic ($3.99): Yeti AI, 98 commands • Pro ($7.99): Smart AI, Watch app, widgets • Pro+ ($15.99): iCloud sync, Family Sharing • Elite ($14.99): Unlimited plans, research citations • Elite+ ($29.99): Everything + Family Sharing Train smarter. Track everything. Achieve more. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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What's New in SubZero Gym

1.3.0

September 29, 2026

Thank you for being part of the SubZero Gym community. We're always working to make your training experience even better. Here's what's new in this update: 26-LANGUAGE SUPPORT SubZero Gym is now fully available in Arabic, Chinese (Simplified & Traditional), Dutch, English, French, German, Greek, Hindi, Indonesian, Italian, Japanese, Korean, Malay, Persian, Polish, Portuguese, Romanian, Russian, Spanish, Swedish, Tagalog, Thai, Turkish, Ukrainian, and Vietnamese. Switch languages anytime in Settings — no app restart needed. AI SPEAKS YOUR LANGUAGE Workout plans, supplement stacks, warm-ups, post-workout summaries, Yeti chat, and voice input all work in your selected language. Yeti understands what you say and responds in your language. PER HAND & PER SIDE TRACKING Every exercise is now tagged with the correct weight entry type. "Per hand" exercises (like Dumbbell Curls) always double volume. "Per side" exercises (like Single Arm Rows) respect your Count Both Sides setting. Blue badges show the type across all screens. NEW FEATURES • Mid-workout exercise swap — tap "Get Yeti Substitution" on any unstarted exercise during an active workout • Smarter sprint & interval plans — HIIT and sprint exercises generate with proper multi-interval structure • Apple Watch displays exercises in your selected language • Live Activity and widgets show text in your app language • Updated to the latest AI models from Anthropic, Google, OpenAI, xAI, DeepSeek and Groq — your selected model carries over automatically IMPROVEMENTS • Cardio distance & time now saved to workout history • Rest timer, RIR picker, and stopwatch overlays now block background interaction • Paused workouts preserve progress and reflect mid-pause swaps • Server retry for transient errors with exponential backoff • Fixed false "Workout Cancelled" alerts on Watch • Smarter fatigue alerts — no longer triggers on the last set • Fixed localized strings leaking into AI prompts

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Subscriptions & In-App Purchases

Basic Monthly

4 plans/mo, 4-week max, budget AI models

$3.991 Month
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