Comparison

Protocol AI vs RepX

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

Head to head
About

Protocol AI

This app acts as a personal training partner, offering intelligent recovery tracking and personalized workout plans. It helps users train smarter, recover effectively, and achieve fitness goals faster by providing insights into body readiness and performance metrics.

Highlights
  • Intelligent recovery tracking
  • Personalized workout plans
  • Body Battery readiness indicator
  • Workout logging with rest timers
  • Performance and sleep insights
Features
Read full description

Unlock Your Full Potential with Protocol Protocol is your personal training partner, combining intelligent recovery tracking with goal-driven workout plans to help you train smarter, recover better, and hit your goals faster. Core Features: Know When to Push or Rest Your Body Battery shows exactly how charged you are, so you can plan intense sessions or take a recovery day with confidence. Personalised Training Plans From muscle gain to recomposition, Protocol builds bespoke 8–24 week programmes based on your goals and fitness level. Track Every Workout Log sets, reps, and weight with built-in rest timers, and see your progress week after week. Performance Insights Get a clear view of your recovery, sleep, strain, and activity to stay on track and avoid burnout. Train with purpose. Recover with precision. Achieve your best. Requires accurate Apple Health data. We recommend Apple Watch for best results, but any device that records heart rate, HRV, sleep, etc. into Apple Health will work.

About

RepX

Log workouts, track progress with detailed graphs, and automatically detect personal records. Generate custom workouts, plan your schedule, and visualize body transformations with progress photos. Offers a free tier with limited logging and a premium subscription for unlimited access.

Highlights
  • Effortless workout logging (reps, weight, duration, RPE)
  • Extensive exercise library with custom options
  • Apple Watch integration for wrist logging
  • Powerful progress graphs and automatic PR tracking
  • Smart workout generator and custom builder
  • Workout calendar and scheduling
  • Progress photo and bodyweight tracking
Features
Read full description

Take your training to the next level with RepX, the ultimate workout partner designed to help you get stronger, faster. Stop tracking in notebooks and spreadsheets. RepX is built for performance, giving you the tools to plan, track, and analyze every part of your fitness journey. YOUR ULTIMATE WORKOUT PARTNER - Effortless Workout Logging: Quickly track every detail: reps, weight, duration, RPE, and rest timers with an interface that keeps you focused on your lift. - Limitless Exercise Library: Start immediately with over 1500+ exercises, or create your own custom movements to fit your unique training style. - Apple Watch Integration: Log sets and track your entire workout directly from your wrist for maximum convenience. SEE YOUR PROGRESS, VISUALIZED - Powerful Progress Graphs: Watch your strength skyrocket with beautiful, easy-to-read graphs for any exercise, muscle group, or time span. - Automatic PR Tracking: We automatically detect and log every new personal record you hit. You break it, we track it. - Session Comparison: Compare any two workout sessions for an exercise to see exactly how you're improving over time. BUILD SMARTER WORKOUTS, INSTANTLY - Workout Generator: Tell the app your target muscles and available equipment, and our smart algorithm will build a complete workout for you. - Custom Workout Builder: Easily craft your own perfect routines from scratch. - Smart Warmup Calculator: Get perfectly calculated warmup sets to prepare your body for peak performance. - Exercise Substitute: Instantly find the perfect alternative for any exercise to keep your workout flowing. PLAN FOR SUCCESS & STAY CONSISTENT - Workout Calendar: Schedule your training sessions and rest days to stay consistent and accountable. - Never Miss a Day: Get notifications for upcoming workouts and see your completion history at a glance. TRACK MORE THAN JUST WEIGHTS - Progress Photos: Take photos directly in the app and compare them side-by-side to visualize your body transformation. - Bodyweight Tracking: Log your weight to connect your strength gains with your physical progress. TRY REPX FOR FREE Download for free and log complete workouts on three different days to experience the core features firsthand. UNLOCK REPX PREMIUM A subscription unlocks unlimited workout logging. Gain full, unrestricted access to all features to smash your goals without limitation. Privacy Policy: https://repxapp.net/privacy EULA: https://repxapp.net/eula

Screenshots

Protocol AI4 screens
RepX4 screens

Verdict

The call

The clearest difference is review sentiment: RepX at 100% against Protocol AI's 0%. RepX also leads on rating (5.0 vs 1.0) and update cadence (daily vs every 4 days). Protocol AI's advantage is iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases and monetization model 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. Protocol AI sells 8 in-app purchases, starting at $4.99 per month and RepX sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

RepX holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: RepX has 18 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Protocol AI's written reviews are positive against 100% of RepX's.

UpkeepUpdate frequency

Protocol AI ships an update every 4 days, RepX daily. The most recent releases landed on September 16, 2026 and September 11, 2026 respectively.

Scorecard5 real differences · 5 level
Protocol AI versus RepX: the parameters behind the verdict, then further details
ParameterProtocol AIRepX
PriceFreeFree
Rating1.0 (1 ratings)5.0 (18 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings118 — better
Update frequencyEvery 4 daysDaily — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, Apple Watch — better
Requires iOS15.1 — better18.0
Further details — not scored
Size52 MB30 MB
Age rating4+4+
DeveloperWARREN JAMES DAYRepX LLC

Customer experience

Protocol AI

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

RepX

All ratings18 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

8 purchases

Protocol AI

Subscriptions8
  • Unlimited access3 Days trial$4.991 Month
  • Unlimited access7 Days trial$4.991 Month
  • Unlimited access$14.991 Month
Show 5 more
  • Unlimited access3 Days trial$14.991 Month
  • Unlimited access$39.991 Year
  • Unlimited access3 Days trial$39.991 Year
  • Unlimited access7 Days trial$39.991 Year
  • Unlimited access$59.991 Year
2 purchases

RepX

Subscriptions2
  • RepX Monthly Premium14 Days trial$0.991 Month
  • RepX Annual Premium14 Days trial$5.991 Year

Questions

Is Protocol AI free?
Protocol AI is free to download, with in-app purchases available.
Is RepX free?
RepX is free to download, with in-app purchases available.
Which has better reviews, Protocol AI or RepX?
RepX is rated higher. Protocol AI averages 1.0 out of 5 from 1 ratings, while RepX averages 5.0 from 18 ratings.
Do Protocol AI or RepX have ads?
Neither Protocol AI nor RepX shows ads.
Which is updated more often, Protocol AI or RepX?
Protocol AI ships an update every 4 days, and RepX daily. Most recently, Protocol AI was updated on September 16, 2026 and RepX on September 11, 2026.

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