Comparison

Flex vs TheBuild

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

Head to head
About

Flex

Features
Read full description

Flex: Stretching Routines for a Healthier You Flex is your go-to app for building flexibility, improving mobility, and relieving tension through guided stretching routines. Whether you’re waking up, cooling down after a workout, or just need a moment to relax, Flex offers personalized routines tailored to your body and goals. Why Flex? Diverse Stretching Routines: Choose from a wide range of stretches like Arm Circles, Kneeling Cat Stretch, Standing Neck Flexor Stretch, and more. Track Your Progress: Stay motivated with streak tracking, longest streak stats, and daily completion goals. Personalized Recommendations: Get routine suggestions based on your preferences and fitness level. Customizable Settings: Adjust voiceovers, sound effects, and timers to make every session your own. Set Reminders: Never miss a stretch session with easy-to-set reminders. Easy to Use: Enroll in routines, start stretching, and edit preferences with a user-friendly interface. Stretches for Every Need From dynamic warm-ups to deep relaxation, Flex has stretches to suit every moment of your day. Whether you want to target specific areas like your neck, shoulders, or hips or enjoy a full-body session, Flex has you covered. Start your journey to better flexibility, improved posture, and a more relaxed mind and body. Download Flex now and feel the difference! For terms of use and privacy policy, visit: https://betterfutures.studio/flex/terms-of-use

About

TheBuild

Transform social media workout videos into structured, followable routines. This app analyzes video links to create set-by-set plans, track your progress, and build training streaks. Log your actual performance and discover new workouts.

Highlights
  • AI video analysis for workout creation
  • Structured set-by-set workout plans
  • Customizable exercise details
  • Detailed workout logging
  • Progress tracking with heatmaps and streaks
  • Workout exploration and saving
  • Dark interface for gym focus
Features
Read full description

Paste a link. Start training. You found the perfect workout on Instagram. A coach crushing a HIIT circuit on TikTok. A strength routine on YouTube you want to try tomorrow. The problem? You can't follow a video mid-set. You lose the post. You forget the exercises. TheBuild fixes that in seconds. Paste the URL. Our AI analyze the video, identifies every exercise, and builds a structured workout you can actually follow set by set, rep by rep, with rest times and muscle groups mapped out. No more pausing and rewinding. No more screenshots of someone else's routine. YOUR WORKOUTS, YOUR WAY Every workout type gets its own intelligent layout: - Strength and CrossFit routines show expandable exercise cards with sets, reps, weight, and rest periods - HIIT sessions display work/rest intervals, rounds, and exercise breakdowns - Tabata circuits render cycle-by-cycle grids so you never lose your place - Cardio and running plans show pace segments on a visual timeline - Yoga, pilates, and barre flows break down phase by phase, pose by pose Make any workout yours. Edit exercises, adjust sets and reps, change weights. LOG EVERYTHING After your session, log what you actually did. Record duration, sets, reps, and weight for every exercise. No guessing, no approximations. Your data is yours. TRACK YOUR CONSISTENCY A weekly activity heatmap shows your training at a glance. Build streaks by training on consecutive days. Earn badges for milestones : Your first session, 10 sessions, a 7-day streak, a 30-day streak. Small wins that compound. EXPLORE AND SAVE Browse community workouts in the Explore tab. Save anything that catches your eye. Build a personal library of routines you trust, organized and ready when you are. DESIGNED FOR FOCUS TheBuild is built for dark environments the gym at 6 AM, your garage at midnight. A refined dark interface with warm amber accents keeps the focus on your next set, not the screen. Our app is subscription based, for more information, please read our Terms of Use here : https://thebuild.thesetter.info/terms.html Paste a link. Build the workout. Log the session. Repeat.

Screenshots

Flex4 screens
TheBuild4 screens

Verdict

The call

The clearest difference is ads: Flex at none against TheBuild's shown. Flex also leads on iOS requirement (13.4 vs 15.1). TheBuild's advantage is update cadence (every 2 weeks vs every 3 months). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Flex sells 2 in-app purchases, starting at $13.99 per month and TheBuild sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Flex ships an update every 3 months, TheBuild every 2 weeks. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.

Scorecard3 real differences · 7 level
Flex versus TheBuild: the parameters behind the verdict, then further details
ParameterFlexTheBuild
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesYesYes
Monetization—Subscription
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.4 — better15.1
Further details — not scored
Size70 MB78 MB
Age rating17+4+
DeveloperCAPNKLUTCHSabri Ben Hmida

In-app purchases

2 purchases

Flex

Subscriptions2
  • Premium Monthly$13.991 Month
  • Premium Annual$39.991 Year
3 purchases

TheBuild

Subscriptions3
  • TheBuild Premium3 Days trial$1.997 Days
  • TheBuild Premium7 Days trial$6.991 Month
  • TheBuild Premium7 Days trial$59.991 Year

Questions

Is Flex free?
Flex is free to download, with in-app purchases available.
Is TheBuild free?
TheBuild is free to download, with in-app purchases available.
Do Flex or TheBuild have ads?
TheBuild shows ads; Flex does not.
Which is updated more often, Flex or TheBuild?
Flex ships an update every 3 months, and TheBuild every 2 weeks. Most recently, Flex was updated on October 15, 2026 and TheBuild on October 2, 2026.

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