Comparison

CGX vs OSTEO

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

Head to head
About

CGX

This premium strength and fitness app offers structured, progressive training programs for all levels. Access hundreds of on-demand workouts, instructional videos, and progress tracking. It also provides meal ideas and expert articles to support your fitness journey.

Highlights
  • Exclusive workout programs
  • On-demand strength and cardio
  • Coached training with form focus
  • Instructional videos
  • Progress tracking
  • Meal ideas
  • Offline training
Features
Read full description

Build who you want to be with CGX by Caroline Girvan. CGX is a premium strength and fitness app built around exclusive, structured training programs. Every program is progressive and designed to help you build strength, improve fitness, and train with consistency over time. Inside CGX you’ll find: • Exclusive workout programs for all levels, from complete beginner to advanced • Hundreds of on-demand strength, cardio, and conditioning workouts • Clear, coached training with a strong focus on proper form and technique • Short, effective workouts that fit real life without compromising results CGX goes beyond the workout itself, supporting your training journey in a practical and sustainable way: • Instructional videos to help you train safely and confidently • Simple progress tracking and quick fitness tests • Nutritious, budget-friendly meal ideas • Evidence-based articles from Caroline and trusted industry experts Train in a way that suits your routine: • Schedule workouts and programs in your CGX calendar • Download workouts for offline training • Cast workouts to your TV with AirPlay or Chromecast • Choose Caroline’s music, no music, or your own via Apple Music or Spotify • Sync your training with Apple Health • Save favourites and track progress workout by workout • Share encouragement and tips through supportive comments under each workout • Train anywhere using the CGX website on your laptop or computer Caroline Girvan is a certified personal trainer, MNU certified nutritionist, and pre- and postnatal specialist with over a decade of experience and a global following of millions. CGX brings her proven training approach into a focused, premium platform designed for long-term progress. Build who you want to be. Cx

About

OSTEO

This program offers a 52-week exercise plan designed to strengthen bones, particularly for pre-menopausal women. It includes pre-conditioning, stretching, and progressive osteogenic exercises performed at home.

Highlights
  • 52-week bone health program
  • Pre-conditioning exercises
  • Stretching routines
  • Progressive osteogenic exercises
  • Home-based workouts
  • Impact tracking
Features
Read full description

You can build and strengthen your bones with our OSTEO-GAINS Bone Health Program Year One. Proven for pre-menopausal women from 31-50 years of age to effectively stimulate bone to benefit your hips and lumbar spine over 52-weeks. The OSTEO-GAINS Bone Health Program Year One costs US$24.99 for 12-months access. No free trial is offered with the Bone Health Program. Once you download and register for the App, you get FREE access to the Pre-Conditioning Program and FREE access to the Stretching Program. Future access, e.g., Bone Health Year One or Bone Health Year Two, will require manual separate payments of US$24.99 for Year One or $28.99 for Year Two. Subscriptions do not auto-renew annually. ONE: Prepare Start with our OSTEO-GAINS Pre-Conditioning Program for the first 4 weeks. You will repeat each session (approximately 23-24.5 minutes) 3 times each week to get your body ready for the OSTEO-GAINS Bone Health Program. Complete the 12 sessions over one month before purchasing the OSTEO-GAINS Bone Health Program. TWO: Stretch Perform the OSTEO-GAINS Stretching Program (approximately 14-14.5 minutes) after every Pre-Conditioning session to help your muscles recover, or use the Stretching Program as often as you like. THREE: Perform The OSTEO-GAINS Bone Health Program Year One is performed barefooted on a firm and forgiving surface, such as carpet, grass, wooden floors or sand and works in 4-week blocks. You repeat the same session for 4 weeks before progressing to the next new 4-week block. The OSTEO-GAINS Bone Health Program Year One is designed to be progressive and repetitive. This program includes osteogenic exercises that take approximately 3-5 minutes a day, and you can do them in the comfort of your own home ... while you wait for the kettle to boil. In the OSTEO-GAINS Bone Health Program Year One, you will be guided through a structured exercise program that becomes progressively more difficult over 12-months. In the Bone Health Program Year One, you will 'Jump, Jump, Rest, Repeat' to strengthen your bones 2-5 times each week, using a series of specific jumps and jump-landings. Our research found that bone health in premenopausal women improved (3.5 to 5% at the end of 12-months) when they performed the exercises, taking only 3-5 minutes a day. Our research informed how we structured our 12-month OSTEO-GAINS Bone Health Program Year One. We measured improved compliance and technique, which led to significant lower body bone health improvements in our research participants. The OSTEO-GAINS Bone Health Programs are a supplementary osteogenic exercise program to specifically target bone health and can be performed alongside your regular exercise programs. PROGRESS Keep track of your landings/impacts progress over 52 weeks. DEXA Scan We recommend, where possible, getting a DEXA scan done before you start our OSTEO-GAINS Bone Health Program Year One. This will provide a benchmark measure of your current bone health and the ability to track any changes in your bone health over time.

Screenshots

CGX4 screens
OSTEO4 screens

Verdict

The call

The clearest difference is rating: CGX at 4.2 against OSTEO's 2.4. CGX also leads on review sentiment (55% vs 36%) and ratings volume (642 vs 48). On price, update cadence, 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

Both are free to download. CGX sells 2 in-app purchases, starting at $12.99 per month and OSTEO sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

CGX holds the better App Store score, 4.2 against 2.4. That said, the two scores are not equally well evidenced: CGX has 642 ratings behind it against 48, so its average is the more settled of the two. Written reviews point the same way: 55% of CGX's written reviews are positive against 36% of OSTEO's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 8 days. The most recent releases landed on October 30, 2026 and October 22, 2026 respectively.

Scorecard5 real differences · 6 level
CGX versus OSTEO: the parameters behind the verdict, then further details
ParameterCGXOSTEO
PriceFreeFree
Rating4.2 (642 ratings) — better2.4 (48 ratings)
Positive reviews54.5% of reviews — better36.2% of reviews
Number of ratings642 — better48
Update frequencyEvery 8 daysEvery 8 days
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium — betterPaid
Best chart rank#134 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.415.0 — better
Further details — not scored
Size88 MB59 MB
Age rating4+4+
DeveloperCGX LtdOSTEO-GAINS LTD

Customer experience

CGX

All ratings643 ratings
Positive75.9%
Neutral10.1%
Negative14.0%
Written reviews352 reviews
Positive54.5%
Neutral20.5%
Negative25.0%

OSTEO

All ratings45 ratings
Positive28.9%
Neutral8.9%
Negative62.2%
Written reviews58 reviews
Positive36.2%
Neutral8.6%
Negative55.2%

User reviews

CGX

From 642 App Store ratings

What we love

  • 🚀 Great workouts
  • 💡 Variety of programs
  • 👍 Helpful form videos
  • 👍 Informative articles
  • 👍 Ability to use own music

Room to improve

  • 🐛 Buggy app performance
  • 🐛 Casting/streaming issues
  • 🐛 Calendar/scheduling problems
  • 🐛 Login/account issues
  • 🐛 Lack of progress tracking

OSTEO

From 48 App Store ratings

What we love

  • 👍 Simple and easy to use
  • 🔬 Research-backed and genuine
  • 💪 Great for bone health
  • ✨ New updates are great
  • 🏃‍♀️ Motivating for exercise

Room to improve

  • 🐛 Very buggy and glitchy
  • ❌ App doesn't work properly
  • 💳 Expensive renewal cost
  • 🚫 No free trial or sample
  • ⚠️ Price not as advertised

Bugs and requests

CGX

Reported bugs

5 issues
  • App crashes during workouts
  • Workouts not recording as completed
  • Calendar not syncing properly
  • Login issues with existing accounts
  • Airplay/casting not working consistently

Requested features

5 requests
  • Ability to mark/track completed workouts
  • Option to remove entire programs from calendar
  • Customizable rest day scheduling
  • Integration with fitness trackers
  • Web/desktop version of the app

OSTEO

Reported bugs

13 issues
  • App crashes or won't open
  • Login issues (email/account not recognized)
  • Purchased app doesn't allow login
  • Cannot create a login
  • App freezes or doesn't progress
Show 8 more
  • Videos not playing or loading
  • Workouts not showing as complete
  • Upgrade causes loss of access
  • Intro video stuck, cannot exit
  • Dio exception errors
  • Jumps counter not working
  • Manual entry required for signup
  • Charged but no access to programs

Requested features

8 requests
  • Add 'get ready' verbal cues
  • Calendar-style progress dashboard
  • Verbal instructions for exercises
  • Option to skip intro videos
  • Countdown feature without volume
Show 3 more
  • Default to previous session
  • More intuitive layout
  • Free intro exercise

In-app purchases

2 purchases

CGX

Subscriptions2
  • Monthly14 Days trial$12.991 Month
  • Annually14 Days trial$99.991 Year
3 purchases

OSTEO

One-time3
  • 12-Month Plan$14.99
  • 12-Month Plan$24.99
  • Year Two Plan$28.99

Questions

Is CGX free?
CGX is free to download, with in-app purchases available.
Is OSTEO free?
OSTEO is free to download, with in-app purchases available.
Which has better reviews, CGX or OSTEO?
CGX is rated higher. CGX averages 4.2 out of 5 from 642 ratings, while OSTEO averages 2.4 from 48 ratings.
Do CGX or OSTEO have ads?
Neither CGX nor OSTEO shows ads.
Which is updated more often, CGX or OSTEO?
CGX ships an update every 8 days, and OSTEO every 8 days. Most recently, CGX was updated on October 30, 2026 and OSTEO on October 22, 2026.

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