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Flex AI Personal Trainer

Personalised workouts with real-time form feedback.

Health & WellnessFreeWe checked the prices on flexfitnessapp.com on 28 Sep 2026.

Flex AI Personal Trainer homepage screenshot

What is Flex AI Personal Trainer?

Personalised workouts with real-time form feedback.

Who is Flex AI Personal Trainer best for?

Flex AI Personal Trainer is best for iPhone users who lift weights and want an AI coach that checks their form.

  • Checking lifting form

    AI form feedback reviews lifts such as deadlifts, squats and bench press and points out what to fix, to cut the risk of injury.

  • Training without a coach

    It builds each workout from your training history, recovery and goals, and you can ask its assistant, Lex, to adjust for an injury, the kit you have or the time you have.

  • Steady progress

    Auto Progression raises the weight or reps for an exercise based on your last results, so progressive overload happens without planning it yourself.

  • Apple Watch users

    You can log sets straight from the watch, and a muscle recovery tracker and plate calculator sit alongside.

How much does Flex AI Personal Trainer cost?

Flex AI Personal Trainer is free to download with limited features, and its premium subscriptions and one-time upgrades are priced only in the Apple App Store.

Flex AI runs on a freemium model: everyone gets a free version with limited features, and premium features are sold as auto-renewing subscriptions or one-time upgrades through the Apple App Store. The maker's site shows no prices; they appear only in the App Store. Plans and current prices are on flexfitnessapp.com.

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What are the best Flex AI Personal Trainer alternatives?

Three tools on Recaply do Flex AI Personal Trainer's job.

Questions about Flex AI Personal Trainer

What is Flex AI Personal Trainer?

Personalised workouts with real-time form feedback.

Who is Flex AI Personal Trainer for?

Flex AI Personal Trainer is best for iPhone users who lift weights and want an AI coach that checks their form.

Does Flex AI charge you when a free access period ends?

No. Flex AI's terms say that when a free or promotional access period ends, your account goes back to the free version without an automatic charge. Paid subscriptions renew until you cancel in your App Store settings at least 24 hours before renewal.

What are the best Flex AI Personal Trainer alternatives?

The closest alternatives on Recaply are FitnessAI, GymBuddy.ai and Coachify.

Where can I try Flex AI Personal Trainer?

On its official website, flexfitnessapp.com.

Is Flex AI Personal Trainer available on Android?

No. The maker lists Flex AI Personal Trainer for iPhone and Apple Watch only, and every download button on its site goes to the Apple App Store.