Comparison

Flex AI Workout Trainer & Log vs Zeno

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Flex AI Workout Trainer & Log

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
Read full description

Flex AI is the world’s first true AI personal trainer — built for lifters who want to train smarter, progress faster, and perfect their form. Whether you’re chasing size, strength, or consistency, Flex uses real-time AI to guide every rep, adjust your program, and keep you motivated through challenges, leaderboards, and streaks. - Your AI Coach, Every Rep Personalized workouts built automatically by AI personas that learn your goals, history, and preferences. Real-time form feedback powered by patented computer-vision AI — get instant corrections on squats, bench, deadlift, rows, and more. Adaptive progression and deloading backed by sports-science principles — no spreadsheets, no guesswork. - Train Smarter — See Results AI tracks your strength curve and increases weight when you’re ready. Visual progress graphs show PRs, volume, and recovery trends. Track sets, reps, and tempo with a tap — or automatically with Apple Watch. - Stay Motivated & Connected Join a global community of lifters. Compete on leaderboards, build streaks, and earn badges. Post progress photos, celebrate milestones, and share results. - Accessible to Everyone Free to start with all core features included. Upgrade anytime for advanced AI coaching and premium analytics. Designed for all experience levels — from beginners to pros. - Why Flex AI Real-time AI form feedback (patented) Adaptive, science-based programming Progress tracking & recovery insights Gamified streaks + leaderboards Apple Watch integration Built for hypertrophy & strength goals Start Training Smarter — Today Download Flex AI and experience personal training powered by real AI. Perfect your form. Unlock your best lift. Train smarter — free on iPhone + Apple Watch.

About

Zeno

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
Read full description

Zeno is the simple app for people who want to train, eat and move well — without drowning in research, apps and $100 subscriptions. Plan and log your workouts. Track your calories and macros. Build a daily stretching habit. All in one app. Free forever plan. WHAT YOU GET STRENGTH TRAINING Custom workout programs, built around you. - Tell Zeno your equipment, schedule, goals and even your injuries. It builds the plan. - Know exactly what to lift — every set, every rep. - Weights go up automatically as you get stronger. Progressive overload, handled. - Log every set, rep and workout. Watch the numbers climb. - Learn proper form with 3D demonstrations you can rotate and zoom. CALORIE TRACKING Track your calories and macros without the obsession. - Search foods or scan a barcode. - See your calories, protein, carbs and fat at a glance. - Built to support your training, not take over your life. FLEXIBILITY Loosen up and move better. - Follow guided stretching routines. - Target the areas that need it. - A few minutes a day is enough. WHY ZENO Every level, from your first session on. Most apps assume you already know what you're doing. Zeno meets you where you are — beginner to advanced. Nothing to decide. Open the app. It tells you what to do today. One app, not five. Training, nutrition and mobility in one place. Free forever plan. No ads. No credit card. Premium is there if you want more, never a trap. Most workout apps cost over $100 a year. Zeno has a free forever plan. This app won't change your life. You will. Start today. FREQUENTLY ASKED QUESTIONS Is Zeno really free? Yes. The free forever plan gives you real, usable training, tracking and flexibility — no credit card, no trial countdown. Upgrade only if you want more. Do I need any experience? No. Choose beginner, intermediate or advanced. Zeno meets you where you are and progresses as you improve. Is this just a habit tracker? It's more than a tracker. Zeno builds your plan, tells you what to do, and adjusts as you go — from your first session to your hundredth. Terms of service: https://zenoapp.io/#terms-conditions Privacy policy: https://zenoapp.io/#privacy-policy Contact: developer@zenoapp.io

Screenshots

Flex AI Workout Trainer & Log4 screens
Zeno4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Flex AI Workout Trainer & Log ships an update every 9 days, Zeno every 3 weeks. The most recent releases landed on October 20, 2026 and October 22, 2026 respectively.

Scorecard5 real differences · 5 level
Flex AI Workout Trainer & Log versus Zeno: the parameters behind the verdict, then further details
ParameterFlex AI Workout Trainer & LogZeno
PriceFreeFree
Rating4.6 (2.4K ratings)4.8 (316 ratings) — better
Positive reviews69.0% of reviews94.4% of reviews — better
Number of ratings2.4K — better316
Update frequencyEvery 9 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS18.016.0 — better
Further details — not scored
Size574 MB130 MB
Age rating17+4+
DeveloperFlex Artificial Intelligence Inc.Zeno App Pty Ltd

Customer experience

Flex AI Workout Trainer & Log

All ratings2,412 ratings
Positive92.0%
Neutral2.6%
Negative5.4%
Written reviews310 reviews
Positive69.0%
Neutral6.5%
Negative24.5%

Zeno

All ratings281 ratings
Positive97.2%
Neutral1.8%
Negative1.1%
Written reviews143 reviews
Positive94.4%
Neutral2.8%
Negative2.8%

User reviews

Flex AI Workout Trainer & Log

From 2.4K App Store ratings

What we love

  • 🚀 Detailed workout tracking
  • 👍 Customizable workouts
  • 🔒 Comprehensive exercise library
  • 💡 Helpful progress tracking
  • 👍 Clean and intuitive interface

Room to improve

  • 🐛 Glitches and bugs
  • 💰 Expensive premium subscription
  • 🔒 Limited functionality without premium
  • 🐛 Inconsistent rest timer
  • 🐛 Workout data loss

Zeno

From 316 App Store ratings

What we love

  • 👍 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

Room to improve

  • 🐛 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)

Bugs and requests

Flex AI Workout Trainer & Log

Reported bugs

3 issues
  • App crashes on iOS 16 update
  • Inability to log workouts on previous days
  • Inconsistent syncing between app and Apple Watch

Requested features

4 requests
  • Offline workout mode
  • Ability to save and reuse custom workout plans
  • Muscle group targeting and analytics
  • Social features and community integration

Zeno

Reported bugs

7 issues
  • 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
Show 2 more
  • Nutrition module not user-friendly for macro tracking on-the-go
  • Workout history loss on weekly reset

Requested features

13 requests
  • Hydration tracking feature
  • Cardio workout module
  • Progressive overload auto-adjustment for weights
  • Apple Watch compatibility
  • Apple Health integration
Show 8 more
  • Nutrition tracking full release
  • Water intake tracking
  • Muscle-specific split options (Back/Bis, Chest/Tris)
  • Ability to write workout notes
  • More detailed exercise library
  • Customizable weight options
  • Bench press and targeted muscle group exercises
  • Coming soon features visibility

In-app purchases

8 purchases

Flex AI Workout Trainer & Log

Subscriptions6
  • Premium Subscription Monthly$12.991 Month
  • Premium Plus Monthly$29.991 Month
  • Premium Plus Family Monthly$69.991 Month
Show 3 more
  • Premium Yearly Subscription$79.991 Year
  • Premium Plus Yearly7 Days trial$191.991 Year
  • Premium Plus Family Yearly7 Days trial$499.991 Year
One-time2
  • 1 Month Free PremiumFree
  • Lifetime Free PremiumFree
4 purchases

Zeno

Subscriptions4
  • Zeno Plus Monthly Subscription7 Days trial$4.991 Month
  • Zeno Plus Monthly Subscription7 Days trial$15.001 Month
  • Zeno Plus Annual Subscription7 Days trial$49.991 Year
Show 1 more
  • Zeno Plus Annual Subscription7 Days trial$90.001 Year

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 20, 2026 and Zeno on October 22, 2026.

Other comparisons