# Flex AI Workout Trainer & Log vs Exerchain

The clearest difference is rating: Flex AI Workout Trainer & Log at 4.6 against Exerchain's 2.7. Flex AI Workout Trainer & Log also leads on review sentiment (69% vs 27%) and ratings volume (2.4K vs 12). Exerchain's advantage is in-app purchases (none vs 8) and iOS requirement (16.2 vs 18.0). On price, ads and device support 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. Exerchain asks for nothing beyond the download.

Flex AI Workout Trainer & Log holds the better App Store score, 4.6 against 2.7. That said, the two scores are not equally well evidenced: Flex AI Workout Trainer & Log has 2.4K ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 69% of Flex AI Workout Trainer & Log's written reviews are positive against 27% of Exerchain's.

Flex AI Workout Trainer & Log ships an update every 9 days, Exerchain monthly. The most recent releases landed on September 23, 2026 and July 26, 2026 respectively.

## The numbers

| Metric | Flex AI Workout Trainer & Log | Exerchain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (2.4K ratings)](https://appshunter.io/ios/app/flex-ai-workout-trainer-and-log/id1446354547/reviews)** | [2.7 (12 ratings)](https://appshunter.io/ios/app/exerchain/id6508167729/reviews) |
| Number of ratings | **2.4K** | 12 |
| Positive reviews | **69.3% of reviews** | 27.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Monthly |
| Monetization | Freemium | **Free** |
| Size | 574 MB | 73 MB |
| Requires iOS | 18.0 | **16.2** |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [Flex Artificial Intelligence Inc.](https://appshunter.io/developer/1446354546) | [Exerchain](https://appshunter.io/developer/1650318370) |

## What reviewers say

### 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


### Exerchain

[App page](https://appshunter.io/ios/app/exerchain/id6508167729)

This health app uses AI to forecast your weight 1, 3, and 6 months into the future. It automatically logs activity, sleep, and body composition from supported devices, and allows manual meal entry for accurate predictions. Gain insights and personalized routines based on your unique data.

**Highlights:** AI-powered weight prediction (1, 3, 6 months), Automatic activity, sleep, and body composition logging, Manual meal entry for accurate forecasting, AI insights and personalized routines, Syncs with ExerRing, ExerScale, and popular smartwatches

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

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

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

### Is Exerchain free?

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

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

Flex AI Workout Trainer & Log is rated higher. Flex AI Workout Trainer & Log averages 4.6 out of 5 from 2.4K ratings, while Exerchain averages 2.7 from 12 ratings.

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

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

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

Flex AI Workout Trainer & Log ships an update every 9 days, and Exerchain monthly. Most recently, Flex AI Workout Trainer & Log was updated on September 23, 2026 and Exerchain on July 26, 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.*