Comparison

SubZero Gym vs GymRx

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

SubZero Gym

Features
Read full description

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/

About

GymRx

This app helps serious lifters train smarter by logging exercises, sets, reps, and weight. It offers an AI coach for real-time suggestions, a comprehensive exercise library with videos, and detailed progress tracking to help you hit new personal records.

Highlights
  • Log exercises, sets, reps, weight, and RIR
  • AI coach for real-time weight and rep suggestions
  • 264 exercise library with video demonstrations
  • Automatic personal record detection and analytics
  • Syncs with Apple HealthKit
  • Import from other popular workout apps
  • Offline-first functionality
Features
Read full description

GymRx is a powerful workout tracker and gym log built for serious lifters who want to train smarter, track progress, and hit new personal records. Whether you're powerlifting, bodybuilding, or training for strength, GymRx helps you focus on lifting — not typing. LOGGING & WORKOUT TRACKING - Log exercises, sets, reps, weight, and RIR (Reps in Reserve) - Auto-fill previous weight and reps - Automatic 50% and 75% warm-up sets - Cardio & duration-based exercises (running, cycling, planks) - Auto-start rest timer after every set - Live Activity rest timer on your lock screen and Dynamic Island APPLE WATCH - Log sets, reps, and weight directly from your wrist - Rest timer with haptic feedback - Live heart rate monitoring during workouts - Full sync with your iPhone — start on one, continue on the other PUSH COACH — YOUR AI SPOTTER - Real-time weight and rep suggestions on every set - Learns from your history and adjusts for fatigue - RIR-aware — respects your target intensity - Works during the workout, not after 264 EXERCISE LIBRARY WITH VIDEO DEMOS - Filter by muscle group, equipment, or movement pattern - Built-in video demonstrations - Create unlimited custom exercises WORKOUT PLANS & SCHEDULING - Build unlimited workout templates - Assign routines to specific days - Start today's workout in two taps PROGRESS, PRs & ANALYTICS - Automatic personal record detection - Strength percentiles - Workout streak and milestone celebrations - 8 customizable chart types - Calendar heatmap - Muscle frequency & movement balance tracking HEALTH & RECOVERY - Syncs with Apple HealthKit — body weight, HRV, resting heart rate, and sleep - Readiness Score — see if you're recovered enough to push hard today - Body weight trend chart with smoothing and time range filters - All health data stays on your device TOOLS - Plate calculator - Home screen widgets - Siri Shortcuts — "Start Push Day" hands-free - Shareable workout cards - 4 color themes plus full dark mode support IMPORT & EXPORT - Import from Strong, Hevy, JEFIT, and FitNotes - Export your full history (CSV or JSON) - Offline-first — full functionality without internet PREMIUM - Full history access - Training blocks - Advanced analytics - 14-day free trial GymRx offers optional auto-renewing subscriptions for premium features. Payment will be charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. You can manage or cancel subscriptions anytime in Settings > Apple ID > Subscriptions. Terms of Use: https://app.cascademobile.dev/legal/gymrx/terms Privacy Policy: https://app.cascademobile.dev/legal/gymrx/privacy

Screenshots

SubZero Gym4 screens
GymRx4 screens

Verdict

The call

The clearest difference is update cadence: SubZero Gym at every 3 days against GymRx's every 3 weeks. GymRx's advantage is iOS requirement (15.1 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SubZero Gym sells 10 in-app purchases, starting at $3.99 per month and GymRx sells 4 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

SubZero Gym ships an update every 3 days, GymRx every 3 weeks. The most recent releases landed on October 5, 2026 and October 8, 2026 respectively.

Scorecard2 real differences · 8 level
SubZero Gym versus GymRx: the parameters behind the verdict, then further details
ParameterSubZero GymGymRx
PriceFreeFree
Rating—5.0 (5 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—5 — better
Update frequencyEvery 3 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, iPad, Apple WatchiPhone, iPod, Apple Watch
Requires iOS18.615.1 — better
Further details — not scored
Size92 MB68 MB
Age rating4+4+
DeveloperShadowPing LLCGarrett Coughlin

In-app purchases

10 purchases

SubZero Gym

Subscriptions10
  • Basic Monthly$3.991 Month
  • Pro Monthly$7.991 Month
  • Elite Monthly$14.991 Month
Show 7 more
  • Pro+ Monthly$15.991 Month
  • Elite+ Monthly$29.991 Month
  • Basic Annual$39.991 Year
  • Pro Annual$79.991 Year
  • Elite Annual$149.991 Year
  • Pro+ Annual$159.991 Year
  • Elite+ Annual$299.991 Year
4 purchases

GymRx

Subscriptions4
  • GymRx Premium$3.991 Month
  • Cascade Fitness Bundle$6.991 Month
  • GymRx Premium$39.991 Year
Show 1 more
  • Cascade Fitness Bundle$49.991 Year

Questions

Is SubZero Gym free?
SubZero Gym is free to download, with in-app purchases available.
Is GymRx free?
GymRx is free to download, with in-app purchases available.
Do SubZero Gym or GymRx have ads?
Neither SubZero Gym nor GymRx shows ads.
Which is updated more often, SubZero Gym or GymRx?
SubZero Gym ships an update every 3 days, and GymRx every 3 weeks. Most recently, SubZero Gym was updated on October 5, 2026 and GymRx on October 8, 2026.

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