# Flex AI Workout Trainer & Log vs Zeno

The clearest difference is review sentiment: Zeno at 94% against Flex AI Workout Trainer & Log's 69%. Zeno also leads on rating (4.8 vs 4.6) and iOS requirement (16.0 vs 18.0). Flex AI Workout Trainer & Log's advantage is update cadence (every 9 days vs every 3 weeks) and ratings volume (2.4K vs 316). 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 8 in-app purchases, starting at $12.99 per month and Zeno sells 4 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Zeno holds the better App Store score, 4.8 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 316, 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 94% of Zeno's.

Flex AI Workout Trainer & Log ships an update every 9 days, Zeno every 3 weeks. Both last shipped on October 22, 2026.

## The numbers

| Metric | Flex AI Workout Trainer & Log | Zeno |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (2.4K ratings)](https://appshunter.io/ios/app/flex-ai-workout-trainer-and-log/id1446354547/reviews) | **[4.8 (316 ratings)](https://appshunter.io/ios/app/zeno-workout-plan-and-tracker/id1611461607/reviews)** |
| Number of ratings | **2.4K** | 316 |
| Positive reviews | 69.0% of reviews | **94.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | Freemium | Free with in-app purchases |
| Size | 574 MB | 130 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Flex Artificial Intelligence Inc.](https://appshunter.io/developer/1446354546) | [Zeno App Pty Ltd](https://appshunter.io/developer/1611461609) |

## 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


### Zeno

[App page](https://appshunter.io/ios/app/zeno-workout-plan-and-tracker/id1611461607)

This app offers personalized programs for strength training, meditation, breathwork, and flexibility. It guides users from beginner to advanced levels with expert-designed content, helping them build and track new healthy habits.

**Highlights:** Strength training programs, Guided meditation sessions, Breathwork exercises, Flexibility routines, Personalized habit programs, Beginner to advanced levels

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zeno Plus Monthly Subscription | $4.99 | per month |
| Zeno Plus Monthly Subscription | $15.00 | per month |
| Zeno Plus Annual Subscription | $49.99 | per year |
| Zeno Plus Annual Subscription | $90.00 | per year |

**What reviewers like**

- 👍 Comprehensive all-in-one fitness and wellness platform
- 💰 Excellent free version with premium features
- 🎯 Personalized workout generation based on preferences
- 📱 User-friendly and intuitive interface
- 🧘 Diverse features including meditation, breathwork, and flexibility

**What reviewers complain about**

- 🐛 App crashes and stability issues
- ⚙️ Rigid workout generation for advanced lifters
- 💾 Workout history resets weekly without premium
- 🔧 Unresponsive customer support
- ⚠️ Unit conversion bugs (kg/lbs not saving)

**Reported bugs**

- App crashes frequently
- Unit settings reset to feet/pounds without saving changes
- Weight input gets doubled when entered
- Difficulty changing reps and weight values
- App lag when switching to foreground

**Requested features**

- Hydration tracking feature
- Cardio workout module
- Progressive overload auto-adjustment for weights
- Apple Watch compatibility
- Apple Health integration


## 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 Zeno free?

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

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

Zeno is rated higher. Flex AI Workout Trainer & Log averages 4.6 out of 5 from 2.4K ratings, while Zeno averages 4.8 from 316 ratings.

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

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

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

Flex AI Workout Trainer & Log ships an update every 9 days, and Zeno every 3 weeks. Most recently, Flex AI Workout Trainer & Log was updated on October 22, 2026 and Zeno on October 22, 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.*