# Flex vs Flex AI Workout Trainer & Log

The clearest difference is in-app purchases: Flex at none against Flex AI Workout Trainer & Log's 8. Flex also leads on iOS requirement (14.0 vs 18.0). Flex AI Workout Trainer & Log's advantage is rating (4.6 vs 4.2) and ratings volume (2.4K vs 5). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Flex AI Workout Trainer & Log sells 8 in-app purchases, starting at $1.99 per month. Flex asks for nothing beyond the download.

Flex AI Workout Trainer & Log holds the better App Store score, 4.6 against 4.2. That said, the two scores are not equally well evidenced: Flex AI Workout Trainer & Log has 2.4K ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 75% of Flex's written reviews are positive against 69% of Flex AI Workout Trainer & Log's, so the app with the better star average is not the one people write more warmly about.

Flex ships an update fortnightly, Flex AI Workout Trainer & Log every 9 days. The most recent releases landed on September 11, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Flex | Flex AI Workout Trainer & Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/flex-gym-workout-tracker/id986808754/reviews) | **[4.6 (2.4K ratings)](https://appshunter.io/ios/app/flex-ai-workout-trainer-and-log/id1446354547/reviews)** |
| Number of ratings | 5 | **2.4K** |
| Positive reviews | **75.0% of reviews** | 69.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | **Free** | Freemium |
| Size | 5 MB | 574 MB |
| Requires iOS | **14.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [Dino Constantinou](https://appshunter.io/developer/848408117) | [Flex Artificial Intelligence Inc.](https://appshunter.io/developer/1446354546) |

## What reviewers say

### Flex

[App page](https://appshunter.io/ios/app/flex-gym-workout-tracker/id986808754)

This app helps strength training enthusiasts track their workouts. Create custom plans, log reps and weight, and monitor progress with a dashboard and rest timers. It syncs with Apple Health.

**Highlights:** Workout plan creation, Rep and weight tracking, Rest timers, Exercise progress monitoring, Apple Health sync, Customizable units (KG/LB)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 | $1.99 | per month |
| Premium Plus Monthly | $2.99 | per month |
| Premium Yearly Subscription | $9.99 | per year |
| Premium Plus Family Monthly | $9.99 | per month |
| Premium Plus Yearly | $19.99 | per year |
| Premium Plus Family Yearly | $49.99 | 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 Flex free?

Flex is free to download, with no in-app purchases.

### 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, Flex or Flex AI Workout Trainer & Log?

Flex AI Workout Trainer & Log is rated higher. Flex averages 4.2 out of 5 from 5 ratings, while Flex AI Workout Trainer & Log averages 4.6 from 2.4K ratings.

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

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

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

Flex ships an update fortnightly, and Flex AI Workout Trainer & Log every 9 days. Most recently, Flex was updated on September 11, 2026 and Flex AI Workout Trainer & Log on September 23, 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.*