# EVOLUTION 3 vs Flex AI Workout Trainer & Log

The clearest difference is monetization model: Flex AI Workout Trainer & Log at freemium against EVOLUTION 3's subscription. Flex AI Workout Trainer & Log also leads on ratings volume (2.4K vs 238) and update cadence (every 9 days vs every 3 weeks). EVOLUTION 3's advantage is iOS requirement (11.0 vs 18.0). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. EVOLUTION 3 sells 3 in-app purchases, starting at $9.99 per month and Flex AI Workout Trainer & Log sells 8 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for EVOLUTION 3 against 4.6 for Flex AI Workout Trainer & Log. That said, the two scores are not equally well evidenced: Flex AI Workout Trainer & Log has 2.4K ratings behind it against 238, so its average is the more settled of the two. Written reviews are what separate them: 76% of EVOLUTION 3's written reviews are positive against 69% of Flex AI Workout Trainer & Log's.

EVOLUTION 3 ships an update every 3 weeks, Flex AI Workout Trainer & Log every 9 days. Both last shipped on September 29, 2026.

## The numbers

| Metric | EVOLUTION 3 | Flex AI Workout Trainer & Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (238 ratings)](https://appshunter.io/ios/app/evolution-359-workout-program/id1260247611/reviews)** | [4.6 (2.4K ratings)](https://appshunter.io/ios/app/flex-ai-workout-trainer-and-log/id1446354547/reviews) |
| Number of ratings | 238 | **2.4K** |
| Positive reviews | **76.0% of reviews** | 69.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | Subscription | **Freemium** |
| Size | 181 MB | 574 MB |
| Requires iOS | **11.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [EVOLUTION359](https://appshunter.io/developer/1260247610) | [Flex Artificial Intelligence Inc.](https://appshunter.io/developer/1446354546) |

## What reviewers say

### EVOLUTION 3

[App page](https://appshunter.io/ios/app/evolution-359-workout-program/id1260247611)

Follow a year-long weightlifting program with expert video tutorials on proper form. Track your progress, weights, and rest times with built-in tools. This ad-free app offers elite Hollywood personal training to help you achieve your fitness goals.

**Highlights:** Year-long workout program, Expert video tutorials, Progress tracking, Built-in timer, Barbell calculator, Ad-free experience

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EVOLUTION 3:59 Videos & WODs | $9.99 | per month |
| EVOLUTION 3:59 Videos & WODs | $24.99 | per 3 months |
| EVOLUTION 3:59 Videos & WODs | $89.99 | per year |

**What reviewers like**

- 💪 Great for physical and mental health
- 📚 Content aligns with the book
- 🏋️‍♀️ Variety of exercises and training styles
- 👍 Easy to navigate and track weights
- 🎥 Excellent video support for proper form

**What reviewers complain about**

- 💸 Expensive subscription model
- ⏳ Content unlock delays
- 📱 Inconsistent app performance
- 📶 Requires WiFi to open initially
- 🔄 Workouts can be repetitive

**Reported bugs**

- App won't open
- Cannot use after switching phones
- Login fails with error messages in low signal areas
- Workouts are not correct/repeated
- Exercise history/progress lost on break

**Requested features**

- Offer a one-time purchase option
- Add a timer alarm for workouts
- Ensure all exercises have videos
- Allow offline access to workouts
- Improve weight tracking functionality


### Flex AI Workout Trainer & Log

[App page](https://appshunter.io/ios/app/flex-ai-workout-trainer-and-log/id1446354547)

This app uses AI to provide personalized workout plans and real-time form feedback for weightlifters. It tracks progress, offers adaptive progression, and includes motivational features like leaderboards and streaks. It's designed for all experience levels, from beginners to pros.

**Highlights:** AI personal trainer, Real-time form feedback, Personalized workout plans, Adaptive progression, Strength tracking, Community leaderboards, Apple Watch integration

**Features:** Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Subscription Monthly | $12.99 | per month |
| Premium Plus Monthly | $29.99 | per month |
| Premium Plus Family Monthly | $69.99 | per month |
| Premium Yearly Subscription | $79.99 | per year |
| Premium Plus Yearly | $191.99 | per year |
| Premium Plus Family Yearly | $499.99 | per year |
| 1 Month Free Premium | Free | one-time |
| Lifetime Free Premium | Free | one-time |

**What reviewers like**

- 🚀 Detailed workout tracking
- 👍 Customizable workouts
- 🔒 Comprehensive exercise library
- 💡 Helpful progress tracking
- 👍 Clean and intuitive interface

**What reviewers complain about**

- 🐛 Glitches and bugs
- 💰 Expensive premium subscription
- 🔒 Limited functionality without premium
- 🐛 Inconsistent rest timer
- 🐛 Workout data loss

**Reported bugs**

- App crashes on iOS 16 update
- Inability to log workouts on previous days
- Inconsistent syncing between app and Apple Watch

**Requested features**

- Offline workout mode
- Ability to save and reuse custom workout plans
- Muscle group targeting and analytics
- Social features and community integration


## Frequently asked questions

### Is EVOLUTION 3 free?

EVOLUTION 3 is free to download, with in-app purchases available.

### Is Flex AI Workout Trainer & Log free?

Flex AI Workout Trainer & Log is free to download, with in-app purchases available.

### Which has better reviews, EVOLUTION 3 or Flex AI Workout Trainer & Log?

EVOLUTION 3 is rated higher. EVOLUTION 3 averages 4.7 out of 5 from 238 ratings, while Flex AI Workout Trainer & Log averages 4.6 from 2.4K ratings.

### Do EVOLUTION 3 or Flex AI Workout Trainer & Log have ads?

Neither EVOLUTION 3 nor Flex AI Workout Trainer & Log shows ads.

### Which is updated more often, EVOLUTION 3 or Flex AI Workout Trainer & Log?

EVOLUTION 3 ships an update every 3 weeks, and Flex AI Workout Trainer & Log every 9 days. Most recently, EVOLUTION 3 was updated on September 29, 2026 and Flex AI Workout Trainer & Log on September 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*