Comparison

pliability vs The Stack System

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

Head to head
About

pliability

Enhance flexibility, mobility, and recovery with guided stretching routines. This app offers personalized programs, progress tracking, and integrates with fitness devices to help users move better and prevent injuries.

Highlights
  • 1,700+ guided stretching routines
  • Customized mobility training programs
  • Instant start, no equipment required
  • Mobility Test for personalized assessment
  • Short, effective workouts (12-20 mins)
  • Offline video downloads
  • Integrates with WHOOP, Garmin, Apple Health
Features
Read full description

Improve flexibility, recover faster, and move better with pliability - the Official Stretching Partner of HYROX and the mobility app trusted by elite athletes. pliability is your daily stretching, mobility, and flexibility coach. Guided routines help you loosen tight hips, relieve back pain, increase range of motion, and build consistent recovery into your training - for athletes, weekend warriors, and anyone who sits too much. ■ WHY ATHLETES CHOOSE PLIABILITY + Trusted by Tia-Clair Toomey, Laura Horvath, Jake Dearden and thousands of gyms worldwide + Official Stretching Partner of HYROX + Featured by Runner's World, Men's Health, Well+Good, and Inc. Magazine + 1,700+ guided stretching and mobility routines + Programs built by world-class coaches and physical therapists ■ WHAT YOU GET + Daily stretching routines, 12–20 minutes each + Targeted sessions for hips, back, shoulders, hamstrings, and neck + Recovery flows to reduce muscle soreness after workouts + Deep flexibility programs - splits, backbends, overhead mobility + Yoga-inspired mobility flows for every level + No equipment required - start instantly ■ PERSONALIZED TO YOU + Recommended sessions built around the areas you care about, refreshed every week + Set your session length before you start: short, medium, or long + Ask in your own words: "15 minute hip opener before a run" + Save favorites and build your own sessions ■ BUILT FOR EVERY ATHLETE + HYROX, CrossFit & functional fitness + Running, cycling & endurance sports + Weightlifting & strength training + Golf, swimming & combat sports + Yoga, Pilates & general wellness ■ MEASURE YOUR PROGRESS (iPhone + iPad) Our Mobility Test uses advanced on-device technology to measure your active range of motion. + Personalized 3-minute assessment + Detailed report with custom stretching recommendations + Track improvement over weeks and months ■ TRAIN ANYWHERE + Stream on iPhone, iPad, Apple TV, or AirPlay + Download any routine for offline sessions + Short sessions fit any schedule ■ CONNECTS TO YOUR DATA + Syncs with WHOOP, Garmin, and Apple Health + See how mobility work affects your recovery scores + Build smarter recovery into your training load ■ MIND-BODY FOCUS + Breathwork and mindfulness cues in every session + Calm your nervous system while you move + Build a stretching habit that actually sticks Ready to move better? Download pliability and start your 7-day free trial. Get the full library of stretching, mobility, yoga, and recovery routines - trusted by HYROX, CrossFit champions, and athletes who train for performance. Stretch. Move. Recover. pliability move more human.™ Terms of Service: https://pliability.com/terms-of-service Privacy Policy: https://pliability.com/privacy-policy/

About

The Stack System

Enhance your golf game with science-based training modules for speed, wedging, and putting. Improve distance, accuracy, and consistency with personalized practice sessions and detailed analytics. Requires compatible hardware.

Highlights
  • Variable inertia speed training for distance
  • Science-based wedge distance control
  • Gamified putting practice and analytics
  • Personalized practice sessions
  • Real-time scoring and insights
  • Customizable training modes
Features
Read full description

The award-winning golf training app trusted by more than 75,000 golfers — built to help you hit longer drives, wedge it closer, make more putts, and understand your game like never before. STACK SPEED TRAINING Creates personalized training programs designed to help you swing faster and drive the ball farther. TheStack hardware is required. STACK STATS (NEW) Tracks your on-course performance and shows where you can improve. Identify strengths and weaknesses with advanced insights across every club, distance, lie, and more. STACK WEDGING Sharpens your distance control from 140 yards and in with gamified combines and real-time feedback powered by Stack Radar. PRACTICE TRACKER Elevates range sessions with structured full-swing practice and shot tracking for every club in your bag using Stack Radar. STACK PUTTING Combines intentional practice with data-driven analytics so you can test equipment, identify tendencies, and make more putts. LEARNING LIBRARY Access 60+ instructional videos from PGA Tour coach Dr. Sasho MacKenzie covering the key concepts, feels, and drills behind efficient swings and faster speeds. MEMBERSHIPS TheStack Premium Membership — $129/year Includes Stack Speed Training, Stack Stats, Stack Wedging, Practice Tracker, Stack Putting, and the Learning Library TheStack Speed Membership — $99/year Includes Stack Speed Training, Stack Wedging, Practice Tracker, Stack Putting, and the Learning Library TheStack Scoring Membership — $99/year Includes Stack Stats, Stack Wedging, Practice Tracker, Stack Putting, and the Learning Library Payment is charged to your Apple account after purchase. Subscriptions auto-renew unless canceled at least 24 hours before renewal. Any unused portion of a free trial is forfeited upon purchase. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula

Screenshots

pliability4 screens
The Stack System4 screens

Verdict

The call

pliability and The Stack System both sit at 4.8 stars, but that hides the real split: 87% of The Stack System's written reviews are positive against 41% of pliability's. The Stack System also leads on ads (none vs shown) and chart position (#145 vs unranked). pliability's advantage is update cadence (every 5 days vs monthly) and device support (3 vs 1). On price, rating, ratings volume and in-app purchases 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. pliability sells 2 in-app purchases, starting at $19.99 per month and The Stack System sells 6 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for pliability against 4.9 for The Stack System. Both are backed by a comparable volume of ratings — 10K and 7K respectively. Written reviews are what separate them: 41% of pliability's written reviews are positive against 87% of The Stack System's.

UpkeepUpdate frequency

pliability ships an update every 5 days, The Stack System monthly. The most recent releases landed on September 26, 2026 and September 24, 2026 respectively.

Scorecard5 real differences · 6 level
pliability versus The Stack System: the parameters behind the verdict, then further details
ParameterpliabilityThe Stack System
PriceFreeFree
Rating4.8 (10K ratings)4.9 (7K ratings) — better
Positive reviews41.0% of reviews87.0% of reviews — better
Number of ratings10K — better7K
Update frequencyEvery 5 days — betterMonthly
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
Best chart rank—#145 — better
DevicesiPhone, iPad, Apple TV — betteriPhone
Requires iOS16.616.2 — better
Further details — not scored
Size264 MB213 MB
Age rating12+4+
Developerpliability, LLCThe Stack System, LP

Customer experience

pliability

All ratings10,011 ratings
Positive95.8%
Neutral1.0%
Negative3.2%
Written reviews549 reviews
Positive41.0%
Neutral9.1%
Negative49.9%

The Stack System

All ratings7,009 ratings
Positive98.9%
Neutral0.8%
Negative0.3%
Written reviews138 reviews
Positive87.0%
Neutral5.8%
Negative7.2%

User reviews

pliability

From 10K App Store ratings

What we love

  • 🌟 Life-changing for mobility and recovery
  • 👍 Consistent daily routines
  • 🧘‍♀️ Meditative and calming experience
  • 🏋️‍♀️ Effective for athletes and active individuals
  • 🔍 Detailed mobility assessment

Room to improve

  • 🐛 Buggy app with frequent crashes and glitches
  • 💰 Expensive subscription
  • 🔇 Intrusive and repetitive voiceover
  • 🤔 Lack of customization options
  • 📚 Repetitive and limited exercise selection

The Stack System

From 7K App Store ratings

What we love

  • 🚀 Seeing speed gains
  • 👍 Easy to use app
  • 👍 Motivating and helpful
  • 👍 Detailed instructions
  • 👍 Warmup routine

Room to improve

  • 🐛 Glitchy app (audio, dictation, timers)
  • 🔧 Integration issues with other devices
  • 💡 More insights and advice needed
  • 🐛 Inconsistent audio/voice features
  • 🐛 Occasional missing countdown

Bugs and requests

pliability

Reported bugs

5 issues
  • Inability to cancel subscription easily
  • Recurring charges even after cancellation
  • Mobility assessment not accurately detecting issues
  • Syncing issues between app and website
  • Airplay and Chromecast functionality not working reliably

Requested features

5 requests
  • Ability to mute or adjust volume of voiceover and music separately
  • More personalized and adaptive mobility programs based on assessment
  • Integration with Apple Health and other fitness tracking platforms
  • Improved navigation and search functionality
  • Offline mode for routines

The Stack System

Reported bugs

2 issues
  • Putting app not working properly
  • Slope percentage input issue

Requested features

3 requests
  • Calendar integration
  • Music/podcast playback integration
  • Apple Watch support

In-app purchases

2 purchases

pliability

Subscriptions2
  • Athlete Monthly Subscription7 Days trial$19.991 Month
  • Athlete Annual Subscription7 Days trial$179.991 Year
6 purchases

The Stack System

Subscriptions6
  • Stack Putting 1 Week$9.997 Days
  • Stack Putting 1 Wk$9.997 Days
  • TheStack Speed Training3 Days trial$14.997 Days
Show 3 more
  • TheStack Scoring Membership3 Months trial3 variants$99.001 Year
  • TheStack Speed Membership$99.001 Year
  • TheStack Premium Membership1 Year trial$129.001 Year

Questions

Is pliability free?
pliability is free to download, with in-app purchases available.
Is The Stack System free?
The Stack System is free to download, with in-app purchases available.
Which has better reviews, pliability or The Stack System?
The Stack System is rated higher. pliability averages 4.8 out of 5 from 10K ratings, while The Stack System averages 4.9 from 7K ratings.
Do pliability or The Stack System have ads?
pliability shows ads; The Stack System does not.
Which is updated more often, pliability or The Stack System?
pliability ships an update every 5 days, and The Stack System monthly. Most recently, pliability was updated on September 26, 2026 and The Stack System on September 24, 2026.

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