# Flex AI Workout Trainer & Log vs Milestone Strength

The clearest difference is rating: Flex AI Workout Trainer & Log at 4.6 against Milestone Strength's 4.1. Flex AI Workout Trainer & Log also leads on update cadence (every 9 days vs every 28 months) and ratings volume (2.4K vs 15). Milestone Strength's advantage is iOS requirement (12.4 vs 18.0). On price, review sentiment, ads and in-app purchases 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 and Milestone Strength sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Flex AI Workout Trainer & Log holds the better App Store score, 4.6 against 4.1. That said, the two scores are not equally well evidenced: Flex AI Workout Trainer & Log has 2.4K ratings behind it against 15, so its average is the more settled of the two. Written reviews complicate that: 69% of Flex AI Workout Trainer & Log's written reviews are positive against 75% of Milestone Strength's, so the app with the better star average is not the one people write more warmly about.

Flex AI Workout Trainer & Log ships an update every 9 days, Milestone Strength every 28 months. The most recent releases landed on September 29, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | Flex AI Workout Trainer & Log | Milestone Strength |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (2.4K ratings)](https://appshunter.io/ios/app/flex-ai-workout-trainer-and-log/id1446354547/reviews)** | [4.1 (15 ratings)](https://appshunter.io/ios/app/milestone-strength/id1491831096/reviews) |
| Number of ratings | **2.4K** | 15 |
| Positive reviews | 69.3% of reviews | **75.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 28 months |
| Monetization | Freemium | Free with in-app purchases |
| Size | 574 MB | 14 MB |
| Requires iOS | 18.0 | **12.4** |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Flex Artificial Intelligence Inc.](https://appshunter.io/developer/1446354546) | [Layne Fletcher](https://appshunter.io/developer/1491831005) |

## 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


### Milestone Strength

[App page](https://appshunter.io/ios/app/milestone-strength/id1491831096)

Achieve your health and fitness goals with a personalized plan. This application provides a structured approach to help you reach your objectives.

**Highlights:** Personalized fitness plans, Goal achievement tracking, Health and fitness focus, Structured approach

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Custom Training and Nutrition | $449.99 | one-time |


## 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 Milestone Strength free?

Milestone Strength is free to download, with in-app purchases available.

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

Flex AI Workout Trainer & Log is rated higher. Flex AI Workout Trainer & Log averages 4.6 out of 5 from 2.4K ratings, while Milestone Strength averages 4.1 from 15 ratings.

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

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

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

Flex AI Workout Trainer & Log ships an update every 9 days, and Milestone Strength every 28 months. Most recently, Flex AI Workout Trainer & Log was updated on September 29, 2026 and Milestone Strength on June 4, 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.*