Comparison

Reboryn vs Stack

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

Head to head
About

Reboryn

This app helps you improve flexibility and reduce stiffness with structured mobility sessions and daily routines. It offers video guidance, a comprehensive exercise library, and community features to keep you motivated and accountable.

Highlights
  • Regular mobility sessions
  • Community and accountability features
  • Daily 15-minute routines
  • Health app integration
  • Dynamic video guidance
  • Comprehensive exercise library
Features
Read full description

Reboryn: Unlock Your Stiff Body! Transform your body, improve flexibility, and rediscover freedom of movement with Reboryn—the ultimate mobility app designed to help you move, feel, and perform better. Whether you're a beginner, a busy professional, or a seasoned athlete, Reboryn equips you with tools and routines to achieve your goals. Key Features: • Regular Mobility Sessions Stay motivated with structured sessions tailored to specific goals like posture, tight hips, or flexibility. • Community & Accountability Join a supportive community of like-minded individuals. Track your streaks and engage with leaderboards to stay consistent and accountable. • Daily 15-Minute Routines Short on time? Our quick routines fit into any schedule while delivering real results. • Health App Integration Sync with the Health app to track your mobility minutes and progress seamlessly. • Dynamic Video Guidance Follow step-by-step video instructions from mobility experts with clear form cues and modifications. • Comprehensive Exercise Library Explore a wide range of effective exercises for hamstrings, hips, shoulders, ankles, and more. Why Choose Reboryn? • Routines for all levels, from beginners to advanced users. • Proven methods to improve flexibility and reduce stiffness. • Consistent updates with fresh routines and structured sessions to keep you progressing. • Built-in tools for community support and accountability to help you stay on track. Rediscover your freedom of movement. Download Reboryn today!

About

Stack

This app helps you build and complete habits within a 90-day timeframe. It focuses on finishing cycles rather than perpetual tracking, with a limit of three habits at a time. The interface uses a grid to mark progress, and a widget provides quick access to daily tasks.

Highlights
  • Three habit limit
  • 90-day completion cycles
  • Manual grid progress tracking
  • Home-screen widget
  • One honest skip per week
  • No accounts or data collection
Features
Read full description

Stack is a habit tracker with a finish line. Three habits. Ninety days. Then it is done. The stack ships, archives, and you start fresh. The cap of three and the ninety days are not limits to pay past. They are the point. Most habit apps are built to keep you forever. Stack is built to end. - Three habits. No more. The limit is the feature. - Ninety days. A clean quarter, then a finish line. - One honest skip a week. It holds your streak but shows as a skip, never a fake fill. - The grid is the app. Ninety days of dots, filled in by hand. - A home-screen widget with today's three. Tap to mark. - Built in Liquid Glass for iOS 26. No accounts. No subscription. No analytics. Zero data collected. Pay once. It is yours. From hsla0001, an independent studio in New York. Void captures. Loop times. Protocol scores the room. Stack holds intent.

Screenshots

Reboryn4 screens
Stack3 screens

Verdict

The call

The clearest difference is price: Reboryn at Free against Stack's $6.99. Reboryn also leads on ratings volume (9 vs 1) and device support (3 vs 1). Stack's advantage is rating (5.0 vs 1.9) and update cadence (daily vs every 3 weeks). On ads 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

Reboryn is free to download; Stack costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Stack holds the better App Store score, 5.0 against 1.9. That said, the two scores are not equally well evidenced: Reboryn has 9 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Reboryn ships an update every 3 weeks, Stack daily. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.

Scorecard7 real differences · 3 level
Reboryn versus Stack: the parameters behind the verdict, then further details
ParameterReborynStack
PriceFree — better$6.99
Rating1.9 (9 ratings)5.0 (1 ratings) — better
Positive reviews33.3% of reviews—
Number of ratings9 — better1
Update frequencyEvery 3 weeksDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better26.0
Further details — not scored
Size365 MB1 MB
Age rating4+4+
DeveloperA.C.N. 668 709 457 PTY LTD.hsla0001

Customer experience

Reboryn

All ratings9 ratings
Positive22.2%
Neutral0.0%
Negative77.8%
Written reviews6 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

Stack

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Reboryn

No in-app purchases

None

Stack

No in-app purchases

Questions

Is Reboryn free?
Reboryn is free to download, with no in-app purchases.
Is Stack free?
Stack costs $6.99, with no in-app purchases.
Which has better reviews, Reboryn or Stack?
Stack is rated higher. Reboryn averages 1.9 out of 5 from 9 ratings, while Stack averages 5.0 from 1 ratings.
Do Reboryn or Stack have ads?
Neither Reboryn nor Stack shows ads.
Which is updated more often, Reboryn or Stack?
Reboryn ships an update every 3 weeks, and Stack daily. Most recently, Reboryn was updated on October 10, 2026 and Stack on October 14, 2026.

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