Comparison

Flex vs Crusd

Price, ratings, monetisation and update history for both apps, side by side β€” 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

Crusd

Features
Read full description

Crusd is the hybrid training app for runners who lift. Running, strength, and conditioning β€” planned, tracked, and coached as one block, by an AI that runs entirely on your iPhone. Most apps make you choose: a running app OR a lifting app. Crusd treats them as one training life. Stack a marathon block with a push/pull strength plan, add conditioning, and let one coach balance the load. THREE DISCIPLINES. ONE APP. β€’ Running β€” 12-week periodized plans for 5K, 8K, 10K, 15K, Half Marathon, and Marathon, with build, peak, and taper phases. Novice to Advanced. β€’ Strength β€” Push/Pull splits and supersets with progressive overload. Log weights, track PRs, see your trends. β€’ Conditioning β€” HIIT and circuit work to build the engine for hybrid fitness races like Hyrox. AN AI COACH THAT RUNS ON YOUR PHONE Hit a new 5K PR? Crusd notices and celebrates it. Drifting into too many skipped rest days? It nudges you back. Every Sunday, a personalized weekly recap. All generated on-device with Apple Intelligence β€” nothing is sent to a server. KNOW WHEN TO PUSH, KNOW WHEN TO REST Every morning Crusd calculates a 0–100 readiness score from your HRV, resting heart rate, sleep, and recent training load. Five clear zones β€” Primed, Ready, Fair, Fatigued, Depleted β€” show exactly where your body stands. No junk metrics. TRAINING THAT ADAPTS TO YOU Woke up depleted? Your coach can swap today's intervals for an easy recovery run β€” reading your readiness, load, and calendar to make context-aware suggestions. You stay in control: accept, modify, or dismiss. LIFE HAPPENS. SMART BREAKS ADJUST. Sick, injured, or traveling? Pause your plan and Crusd reschedules everything for your return, easing you back gradually instead of jumping to 100%. Race days are never moved. BUILT FOR APPLE β€’ One-tap workout start on Apple Watch via the Workout app β€’ Calendar sync for your planned sessions β€’ HealthKit activity on your dashboard β€’ Private iCloud sync across your devices SEE HOW YOU COMPARE β€” AGAINST YOURSELF Before each run, see your typical pace and lifetime best at that distance. After, see how today stacked up. Honest comparisons against your own history β€” not generic prescribed paces. YOUR DATA STAYS YOURS No cloud AI. No tracking. No ads. No third-party analytics. No backend servers. All AI analysis runs locally on your iPhone; your history syncs only through your private iCloud. Optional Face ID adds another layer. TRAIN IN YOUR LANGUAGE Full localization in 11 languages, with metric and imperial units. FREE FOREVER One active plan, novice running (5K–10K), all strength plans, novice conditioning, workout tracking, readiness score, calendar and Apple Watch sync, streaks, and share cards. CRUSD PRO All running levels and distances (5K–Marathon), multiple active plans, the full AI Coach (celebrations, recaps, warnings), adaptive scheduling, readiness-based adjustments, Smart Breaks, and recovery recommendations. β€” Subscription β€” Crusd Pro is $4.99/month or $34.99/year, with a 14-day free trial. Payment is charged to your Apple ID at confirmation of purchase. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the period; manage or cancel anytime in your Apple ID settings. Privacy Policy: https://crusd.io/privacy.html Terms of Service: https://crusd.io/terms.html Crusd is not a medical device and is not a substitute for professional medical advice. Always consult a physician before beginning any exercise program. Questions? info@crusd.io

Screenshots

Flex4 screens
Crusd4 screens

Verdict

The call

The clearest difference is update cadence: Crusd at every 2 weeks against Flex's every 3 months. Flex's advantage is device support (3 vs 1) and iOS requirement (13.4 vs 26.0). On price, ads and in-app purchases there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Flex sells 2 in-app purchases, starting at $13.99 per month and Crusd sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Flex ships an update every 3 months, Crusd every 2 weeks. The most recent releases landed on September 29, 2026 and October 6, 2026 respectively.

Scorecard3 real differences Β· 3 level
Flex versus Crusd: the parameters behind the verdict, then further details
ParameterFlexCrusd
PriceFreeFree
Update frequencyEvery 3 monthsEvery 2 weeks β€” better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPod β€” betteriPhone
Requires iOS13.4 β€” better26.0
Further details β€” not scored
Size70 MB12 MB
Age rating17+12+
DeveloperCAPNKLUTCHCrusd.io

In-app purchases

2 purchases

Flex

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

Crusd

Subscriptions2
  • Crusd Pro14 Days trial$4.991 Month
  • Crusd Pro14 Days trial$34.991 Year

Questions

Is Flex free?
Flex is free to download, with in-app purchases available.
Is Crusd free?
Crusd is free to download, with in-app purchases available.
Do Flex or Crusd have ads?
Neither Flex nor Crusd shows ads.
Which is updated more often, Flex or Crusd?
Flex ships an update every 3 months, and Crusd every 2 weeks. Most recently, Flex was updated on September 29, 2026 and Crusd on October 6, 2026.

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