# Flex AI Workout Trainer & Log vs Working Sets

The clearest difference is iOS requirement: Flex AI Workout Trainer & Log at 18.0 against Working Sets's 27.0. On price, update cadence, 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 $12.99 per month and Working Sets sells 5 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Flex AI Workout Trainer & Log ships an update every 9 days, Working Sets weekly. The most recent releases landed on October 12, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Flex AI Workout Trainer & Log | Working Sets |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (2.4K ratings)](https://appshunter.io/ios/app/flex-ai-workout-trainer-and-log/id1446354547/reviews)** | — |
| Number of ratings | **2.4K** | — |
| Positive reviews | 69.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | Freemium | — |
| Size | 574 MB | 11 MB |
| Requires iOS | **18.0** | 27.0 |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Flex Artificial Intelligence Inc.](https://appshunter.io/developer/1446354546) | [Karl Koch](https://appshunter.io/developer/1518887592) |

## 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 | $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


### Working Sets

[App page](https://appshunter.io/ios/app/working-sets/id6479754855)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Working Sets Monthly Premium | $2.99 | per month |
| Working Sets Yearly Premium | $22.99 | per year |
| Tip 1 | $0.99 | one-time |
| Tip 2 | $2.99 | one-time |
| Tip 3 | $5.99 | 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 Working Sets free?

Working Sets is free to download, with in-app purchases available.

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

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

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

Flex AI Workout Trainer & Log ships an update every 9 days, and Working Sets weekly. Most recently, Flex AI Workout Trainer & Log was updated on October 12, 2026 and Working Sets on October 1, 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.*