# Flex AI Workout Trainer & Log vs JustLift Workout Tracker

The clearest difference is review sentiment: JustLift Workout Tracker at 100% against Flex AI Workout Trainer & Log's 69%. JustLift Workout Tracker also leads on rating (5.0 vs 4.6) and device support (4 vs 2). Flex AI Workout Trainer & Log's advantage is ratings volume (2.4K vs 6) and update cadence (every 9 days vs every 5 weeks). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Flex AI Workout Trainer & Log sells 6 in-app purchases, starting at $12.99 per month and JustLift Workout Tracker sells 1 in-app purchase, starting at $6.99 per year. Whichever you choose, the download price is not the number that matters.

JustLift Workout Tracker holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Flex AI Workout Trainer & Log has 2.4K ratings behind it against 6, 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 100% of JustLift Workout Tracker's.

Flex AI Workout Trainer & Log ships an update every 9 days, JustLift Workout Tracker every 5 weeks. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Flex AI Workout Trainer & Log | JustLift Workout Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (2.4K ratings)](https://appshunter.io/ios/app/flex-ai-workout-trainer-and-log/id1446354547/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/justlift-workout-tracker/id6758596958/reviews)** |
| Number of ratings | **2.4K** | 6 |
| Positive reviews | 69.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 5 weeks |
| Monetization | Freemium | Freemium |
| Size | 574 MB | 57 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [Flex Artificial Intelligence Inc.](https://appshunter.io/developer/1446354546) | [Joseph Toms](https://appshunter.io/developer/1871791386) |

## 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 (6)**

| 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 |

**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


### JustLift Workout Tracker

[App page](https://appshunter.io/ios/app/justlift-workout-tracker/id6758596958)

Log, plan, and track all your training sessions, from weightlifting to cardio. Features AI-powered plan generation, workout analysis, and an interactive fitness coach. Seamlessly integrates with Apple Watch for real-time tracking.

**Highlights:** Log strength and cardio exercises, Apple Watch app for wrist control, AI-powered training plan generator, Save and reuse workout templates, Progress photo documentation, AI workout analysis and feedback, Offline workout tracking

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| JustLift Premium | $6.99 | per year |


## 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 JustLift Workout Tracker free?

JustLift Workout Tracker is free to download, with in-app purchases available.

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

JustLift Workout Tracker is rated higher. Flex AI Workout Trainer & Log averages 4.6 out of 5 from 2.4K ratings, while JustLift Workout Tracker averages 5.0 from 6 ratings.

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

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

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

Flex AI Workout Trainer & Log ships an update every 9 days, and JustLift Workout Tracker every 5 weeks. Most recently, Flex AI Workout Trainer & Log was updated on November 2, 2026 and JustLift Workout Tracker on October 31, 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.*