Comparison

Evolve21 vs The Underbelly

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

Head to head
About

Evolve21

Engage in a 21-day wellness program with daily 7-minute routines in cardio, yoga, or meditation. Track your progress, earn awards, and support the Cerebral Palsy Foundation. Customize your fundraising page to involve friends and family in your journey and impact.

Highlights
  • Daily 7-minute routines
  • Cardio, Yoga, Meditation options
  • Progress tracking
  • Achievement awards
  • Fundraising customization
  • Group participation
Features
Read full description

Evolve 21: The CPF Challenge Evolve 21 lets you participate in a thoughtful, state-of-the art wellness program which will change the way you see yourself and the world. And while you do, the app also allows you to help support the Cerebral Palsy Foundation, whose work is changing the world for people with disabilities. Each day, choose a simple seven minute routine of cardio exercise, yoga, or meditation. Track your progress for 21 days and unlock achievement awards that show your evolution. All the programs are designed by experts to help you really make a difference in your health and well-being. Evolve 21 is also designed to make it easy to raise dollars from friends, family members, and professional colleagues. With a simple email or photo, show people effort you're making and the impact you're having. And ask them to help. You'll be amazing at the support you'll feel. Every hour another child is born with CP. In just 7 minutes, you can help make their lives better. Evolve 21 lets you choose from all these 7 minute workouts! - Cardio (High Intensity, Agility, or Strength) - Yoga (Balance, Tone, Flow) - Meditation (about 7 minutes each) Choose one type of program, or mix them up daily. All areas have adaptive exercises to address a variety of abilities and disabilities. Select the exercises that feel right for you and we’ll build a daily workout around YOUR needs! MAKE IT A GROUP EFFORT Invite friends and family to:  1. Support your efforts 2. Do Evolve 21 with you. MAXIMIZE YOUR IMPACT Customize your fundraising page: 1. Customize your message 2. Set fundraising goals 3. Add photos

About

The Underbelly

This app offers inclusive yoga and meditation sessions for all bodies and skill levels. Explore guided practices, breathwork, and soothing playlists to enhance flexibility, self-love, and holistic well-being. Practice anytime, anywhere in a welcoming environment.

Highlights
  • 200+ inclusive yoga classes
  • Queer-friendly environment
  • Guided sessions for all levels
  • Meditation and breathwork playlists
  • Monthly livestream classes
  • Ad-free streaming videos
Features
Read full description

Embark on a transformative wellness journey with our inclusive Yoga & Meditation app - celebrating all bodies. Discover your inner teacher through beginner-friendly sessions, designed for flexibility, self-love, and holistic well-being. Practice yoga and mindfulness anytime, anywhere. Explore a diverse range of guided sessions and create a practice that fits your personal needs and daily schedule. Our unique features include soothing meditation and breathwork playlists to uplift your spirits and relieve stress. Elevate your yoga experience with us – embrace balance and inner peace, farts and anger. Key Features: • 200+ inclusive yoga classes for all body types • Queer-friendly and welcoming environment, great for all ages • Beginner, intermediate and expert-friendly guided sessions • Relaxing meditation playlists to help calm your body and mind • Monthly livestream classes directly through the app • No ads or distractions, just beautiful streaming videos To access all features and content you can subscribe to The Underbelly on a monthly or yearly basis with an auto-renewing subscription right inside the app.* Pricing can vary by region and will be confirmed before purchase in the app. In app subscriptions will automatically renew at the end of their cycle. * All payments will be paid through your iTunes Account and may be managed under Account Settings after the initial payment. Subscription payments will automatically renew unless deactivated at least 24-hours before the end of the current cycle. Your account will be charged for renewal at least 24-hours prior to the end of the current cycle. Any unused portion of your free trial will be forfeited upon payment. Cancellations are incurred by disabling auto-renewal. Terms of Service: https://browse.theunderbelly.com/tos Privacy Policy: https://browse.theunderbelly.com/privacy

Screenshots

Evolve214 screens
The Underbelly4 screens

Verdict

The call

The clearest difference is review sentiment: The Underbelly at 99% against Evolve21's 36%. The Underbelly also leads on rating (4.9 vs 3.8) and ratings volume (792 vs 6). Evolve21's advantage is in-app purchases (none vs 2) and update cadence (every 3 days vs every 2 months). On price, ads 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. The Underbelly sells 2 in-app purchases, starting at $19.99 per month. Evolve21 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

The Underbelly holds the better App Store score, 4.9 against 3.8. That said, the two scores are not equally well evidenced: The Underbelly has 792 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 36% of Evolve21's written reviews are positive against 99% of The Underbelly's.

UpkeepUpdate frequency

Evolve21 ships an update every 3 days, The Underbelly every 2 months. Both last shipped on October 12, 2026.

Scorecard7 real differences · 3 level
Evolve21 versus The Underbelly: the parameters behind the verdict, then further details
ParameterEvolve21The Underbelly
PriceFreeFree
Rating3.8 (6 ratings)4.9 (792 ratings) — better
Positive reviews36.4% of reviews98.5% of reviews — better
Number of ratings6792 — better
Update frequencyEvery 3 days — betterEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPodiPhone, iPad, Apple TV — better
Requires iOS10.0 — better16.6
Further details — not scored
Size246 MB98 MB
Age rating12+12+
DeveloperCerebral Palsy FoundationFearless LLC

Customer experience

Evolve21

All ratings6 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews11 reviews
Positive36.4%
Neutral9.1%
Negative54.5%

The Underbelly

All ratings792 ratings
Positive98.0%
Neutral0.3%
Negative1.8%
Written reviews268 reviews
Positive98.5%
Neutral0.4%
Negative1.1%

In-app purchases

None

Evolve21

No in-app purchases

2 purchases

The Underbelly

Subscriptions2
  • Underbelly Monthly7 Days trial$19.991 Month
  • The Underbelly Yearly7 Days trial$179.991 Year

Questions

Is Evolve21 free?
Evolve21 is free to download, with no in-app purchases.
Is The Underbelly free?
The Underbelly is free to download, with in-app purchases available.
Which has better reviews, Evolve21 or The Underbelly?
The Underbelly is rated higher. Evolve21 averages 3.8 out of 5 from 6 ratings, while The Underbelly averages 4.9 from 792 ratings.
Do Evolve21 or The Underbelly have ads?
Neither Evolve21 nor The Underbelly shows ads.
Which is updated more often, Evolve21 or The Underbelly?
Evolve21 ships an update every 3 days, and The Underbelly every 2 months. Most recently, Evolve21 was updated on October 12, 2026 and The Underbelly on October 12, 2026.

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