# Flex - Redefine Strength — Your personal gym app > Your personal gym app (iPhone/iPad app by David Kelen.) - Source: https://appshunter.io/ios/app/flex-redefine-strength/id6744560828 (this page in markdown: same URL + `.md`) - Developer: [David Kelen](https://appshunter.io/developer/1796712157) - Category: Sports, Utilities - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 17.6 · 53 MB - Languages: American English, Croatian, Czech, Danish, French (France), German (Germany), Hungarian, Italian, Polish, European Portuguese and 2 more - Released: 2025-04-14 - Data updated: 2026-08-09 - User reviews in markdown: https://appshunter.io/ios/app/flex-redefine-strength/id6744560828/reviews.md ## What is Flex? Flex is the training companion built for people who take their workouts seriously. Whether you're running circuits, timing intervals, or logging kilometers (or miles), Flex keeps you locked in so you can focus on the work, not the stopwatch. Build custom workouts with exercises, sets, and rest periods tailored exactly to how you train. Start a timer and let Flex handle the countdowns, transitions, and cues while you push through every rep. Track running, walking, hiking, cycling, rowing, HIIT, yoga, and rollerblading with full GPS routes, pace, elevation, and calories, all in one place. Pair with Apple Watch for live heart rate throughout your session, then dive back into your history afterward to see exactly how each set and each exercise felt, down to the beat. Your training lives on your terms. Sign in with an account and your data syncs quietly across every device you own, always available, always yours. Flex isn't about logging workouts. It's about understanding your performance well enough to keep improving it. Flex Emerald unlocks the full experience with an auto-renewing subscription, available monthly or annually. See in-app for current pricing. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Flex - Emerald \| Yearly | $69.99 | per year | | Flex - Emerald \| Monthly | $6.99 | per month | ## Version history (last 5 releases) ### 4.0.3 — 2026-08-04 This version includes bug fixes and improvements. Thank you for using Flex. Let's Redefine Strength together. ### 4.0.2 — 2026-08-03 This version includes bug fixes and improvements but also includes new languages and refinements. Thank you for using Flex. Let's Redefine Strength together. ### 4.0.1 — 2026-08-01 This version includes bug fixes and improvements but also includes ten new languages, such as as French, Spanish and German. Thank you for using Flex. Let's Redefine Strength together. ### 4.0.0 — 2026-07-19 This version introduces live activity recording so you can track running, walking, hiking, cycling, rowing, HIIT, yoga, and rollerblading with full GPS, elevation, and heart rate data. We've added Apple Watch integration to keep live metrics on your wrist while you train, and deep history view so you can scrub through any workout and understand exactly what happened in every set and every rest period. Workout folders help you stay organized, and the improved performance dashboard gives you the insights you need to understand your training and keep improving. It also includes bug fixes, performance enhancements, and small design updates. iOS 27, iPadOS 27 and WatchOS 27 are now fully supported. Thank you for using Flex. Let's Redefine Strength together. ### 3.5.0 — 2026-05-25 This version introduces a new workout creation page to make it easier to navigate and create your workout. It also includes bug fixes, performance enhancements, and small design updates. Thank you for using Flex. Let's Redefine Strength together. ## Apps similar to Flex | App | Rating | Price | Category | | --- | --- | --- | --- | | [Billiards Shot Clock](https://appshunter.io/ios/app/billiards-shot-clock/id6746351721) | 5.0 (3) | Free | Sports | | [Personal Interval Timer](https://appshunter.io/ios/app/personal-interval-timer/id1479646964) | 4.8 (11) | Free | Sports | | [Boxing Timer Simple](https://appshunter.io/ios/app/boxing-timer-simple/id6738644159) | — | Free | Sports | | [Boxing, HIIT, Interval timer](https://appshunter.io/ios/app/boxing-hiit-interval-timer/id6742114962) | — | Free | Sports | | [Pull-Up Boss](https://appshunter.io/ios/app/pull-up-boss/id6745743476) | — | Free | Sports | | [FXL Loopsy](https://appshunter.io/ios/app/fxl-loopsy/id1513460317) | 4.5 (2) | Free | Sports | ## More apps by David Kelen - [Multiplier - By Mather](https://appshunter.io/ios/app/multiplier-by-mather/id6742082508) - [Adder - By Mather](https://appshunter.io/ios/app/adder-by-mather/id6742083110) - [Subtractor - By Mather](https://appshunter.io/ios/app/subtractor-by-mather/id6742201502) - [Divider - By Mather](https://appshunter.io/ios/app/divider-by-mather/id6742565268) - [Blink. - Morse In Your Pocket](https://appshunter.io/ios/app/blink-morse-in-your-pocket/id6743200419) - [@CalcMaster](https://appshunter.io/ios/app/calcmaster/id6743536646) All apps by David Kelen: https://appshunter.io/developer/1796712157 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-09.*