Flex vs Impact Gym
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Flex
This app helps strength training enthusiasts track their workouts. Create custom plans, log reps and weight, and monitor progress with a dashboard and rest timers. It syncs with Apple Health.
- Workout plan creation
- Rep and weight tracking
- Rest timers
- Exercise progress monitoring
- Apple Health sync
- Customizable units (KG/LB)
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Flex is a simple yet powerful workout tracker that has been designed for anyone who engages in strength training. Effortlessly create workout plans, track workouts, and browse previous workouts all with a simple and intuitive user interface. Features: - Useful dashboard that shows all time statistics, recent workouts, and the next workout in your current workout cycle - Create custom workout plans for any kind of program (such as Starting Strength or StrongLifts 5×5) - Duplicate existing workout plans which make it easy to create similar plans with slight variations - Track reps and weight performed for each exercise during a workout and compare them the last workout - great for pushing yourself. - Automatic and customisable rest timers that are triggered automatically when completing each set - Comprehensive exercise list to choose from when creating workouts - Create custom exercises for your workouts - Choose between metric (KG) and imperial (LB) units for sets - View your complete chronological workout history - Keep track of your exercise progress and personal bests - Automatically sync workouts with Apple Health
Impact Gym
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Guiding you through your health and fitness journey! - Book classes online in just a few clicks - Track your progress from all your workouts - Keep track of your body measurements and progress - Take part in regular fitness challenges - Contact club staff directly - See all the latest club news, offers and events - Refer Friends to the club online - Recipes Library - Video Workout Library Apple Health App Integration Track your progress with our HealthKit app integration to import and measure your daily steps, distance or calories burnt. Also use HealthKit to import your data from a range of different wearable devices.
Screenshots
Verdict
The clearest difference is update cadence: Flex at fortnightly against Impact Gym's every 7 months. On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Flex ships an update fortnightly, Impact Gym every 7 months. The most recent releases landed on September 11, 2026 and March 26, 2026 respectively.
| Parameter | Flex | Impact Gym |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) — better | — |
| Positive reviews | 75.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Fortnightly — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Dino Constantinou | Ashbourne |
In-app purchases
Flex
No in-app purchases
Impact Gym
No in-app purchases
