Comparison

NOFFS Sandbag vs BELLS, Kettlebell Workouts

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

Head to head
About

NOFFS Sandbag

This app offers a structured fitness program developed by the Navy, focusing on strength, power, and injury prevention. It includes exercises mimicking operational duties, personalized fueling strategies, and regeneration techniques for improved mobility and performance.

Highlights
  • Sandbag training program
  • Strength and power development
  • Injury prevention strategies
  • Personalized fueling guidance
  • Regeneration and mobility routines
  • Three-phase training progression
Features
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NOFFS Sandbag Series Developed by the Navy in partnership with EXOS (formerly Athlete’s Performance Institute), the Navy Operational Fitness and Fueling System (NOFFS) is designed to provide the Navy with a "world-class" performance training resource for Sailors, as well as Navy health and fitness professionals. Using the latest sports science methodologies, NOFFS combines both human performance and injury prevention strategies, resulting in safer training while yielding positive human performance outcomes. The exercises used in the NOFFS program are designed to replicate the activities Sailors conduct in their operational duties: lifting, pushing, pulling, and carrying. Developed as a complete fitness package, the fueling strategies allow you to determine your total caloric needs based on your personal goals, whether your desire is to lose, maintain or gain weight. The meal builder enables you to choose high-octane foods for each meal, populate your meal plan a week at a time, and email it to yourself. Finally, the regeneration component of this series will assist you with addressing and preventing common aches and pains. The soft tissue release techniques combined with the flexibility routine restores muscular balance and ensures you develop and maintain the mobility necessary for high-level performance. The Sandbag Series is an advanced program designed as a progression to the Operational Series (NOFFS 1.0). This series provides you with a training plan that can be performed in environments with limited equipment options and will assist you with developing the strength and power needed to meet the performance demands placed upon you in any environment. The added challenge of performing traditional exercises with a less stable mass (sand-filled bag) provides a unique training experience that mimics the demands experienced in day-to-day life. The series progresses through three phases of training by building upon the work completed in the previous phase and preparing for what’s to come. The first phase, Build Your Base, establishes a strong base fitness level. The second phase, Gain Muscle, develops lean muscle mass and increases workout capacity through the use of higher sets and repetitions. In the third phase, Get Powerful, movements will become more explosive, therefore developing the power necessary for immediate bursts of energy often required in operational environments.

About

BELLS, Kettlebell Workouts

This app guides and tracks kettlebell workouts, allowing users to program and share custom routines. It offers QuickStart features for immediate training and the ability to add custom skills with video links. Premium content includes monthly new workouts and professionally designed programs.

Highlights
  • Custom workout programming
  • Workout sharing
  • QuickStart features (Ladder, EMOM, Straight Sets, Custom)
  • Add custom skills and video links
  • Workout history tracking
  • Monthly premium workouts
  • Professionally designed workout programs
Features
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Bells helps elevate your training by guiding and tracking your kettlebell workouts. It provides a simple way to program workouts to share them with other users and your students with the push of a button. It has four QuickStart features allowing you to jump into any training session. You can build on your QuickStart to create a workout on the fly with ease. Then save it for sharing or completing again at another time. Preset with a list of basic kettlebell skills and an option to add your own. You can provide detailed instructions to create workouts and include links to your video demos via YouTube or Vimeo links. Don’t want to program workouts? New workouts monthly in the premium feature, so your training never gets stale. Access premium for 12 tried and tested workouts created by professional kettlebell instructors for about $10 monthly. Or purchase professionally designed programs that will elevate your training. Each program is available for a single purchase and loads directly into your BELLS app. They are designed for all levels, from beginner to advanced, with instructions and videos. Download today and STAY STRONG! QUICKSTARTS Quickly and easily get into your workout or training session using our QuickStart features. Once you have started a session using the quickstart feature and it finishes, you can add additional skills or complexes and create a workout that can be saved and shared. -LADDER: This allows you to track your rungs as you go through a ladder-style training set. -EMOM: A simple ‘EVERY MINUTE ON THE MINUTE’ timer at your fingertips. -STRAIGHT SETS: quickly set up your rep and set schemes, including any rest breaks you need, and then all you have to do is follow along and do the work you program. -CUSTOM: In this feature, you can set custom timer settings. Such as specific work-to-rest ratios, and include sets and reps if desired. PLAN YOUR WORKOUT Build your workouts by selecting a ‘single skill’ or ‘build your complex.’ You can choose from our preset exercise selection or add your own skill. Choose whether you have one bell or two, the weight, sets, reps, and rest period length. Once you select your skill, you can move to the mode and choose between Ladder, EMOM, straight sets, or custom. You have the option to add instructions for specifics on your skill or complex and include a link to an external video if examples are needed. After adding all the workout elements, you can start the workout and get to it or save the workout and then generate a link to share or come back to it later. SHARE YOUR WORKOUTS Bells is excellent for coaches and trainers to have an easy and free way to create and share workouts with athletes/students/clients. With the bells app, you can plan your workout and create a customized one you can easily share with another user. WORKOUT HISTORY Here you can see a log of workouts you have completed. You will see how long your workout took and a total of kilograms lifted in the session based on the weight set in the workout. SUBSCRIPTION You can subscribe and pay through your iTunes account. Payment will be charged to iTunes Account at confirmation of purchase. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours before the end of the current period. The user may manage subscriptions, and auto-renew may be turned off after purchase by going to the ‘Manage Subscription’ page in settings.

Screenshots

NOFFS Sandbag4 screens
BELLS, Kettlebell Workouts3 screens

Verdict

The call

The clearest difference is in-app purchases: NOFFS Sandbag at none against BELLS, Kettlebell Workouts's 12. NOFFS Sandbag also leads on rating (5.0 vs 4.8) and iOS requirement (9.0 vs 15.6). BELLS, Kettlebell Workouts's advantage is update cadence (every 2 months vs every 23 months) and ratings volume (27 vs 4). On price, review sentiment, 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. BELLS, Kettlebell Workouts sells 12 in-app purchases, starting at $2.99 per month. NOFFS Sandbag asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

NOFFS Sandbag holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: BELLS, Kettlebell Workouts has 27 ratings behind it against 4, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

NOFFS Sandbag ships an update every 23 months, BELLS, Kettlebell Workouts every 2 months. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 4 level
NOFFS Sandbag versus BELLS, Kettlebell Workouts: the parameters behind the verdict, then further details
ParameterNOFFS SandbagBELLS, Kettlebell Workouts
PriceFreeFree
Rating5.0 (4 ratings) — better4.8 (27 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings427 — better
Update frequencyEvery 23 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS9.0 — better15.6
Further details — not scored
Size158 MB85 MB
Age rating4+4+
DeveloperCNIC HQJanus movement solutions LLC

Customer experience

NOFFS Sandbag

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

BELLS, Kettlebell Workouts

All ratings26 ratings
Positive92.3%
Neutral3.8%
Negative3.8%
Written reviews14 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

NOFFS Sandbag

No in-app purchases

12 purchases

BELLS, Kettlebell Workouts

Subscriptions3
  • Monthly$2.991 Month
  • Monthly3 Days trial$9.991 Month
  • Annually3 Days trial$89.991 Year
One-time9
  • Program A1$0.29
  • Program B1$1.99
  • Program B3$4.99
Show 6 more
  • Program C2$19.99
  • Program C4$29.99
  • Program C5$39.99
  • Program D1$59.99
  • Program D4$89.99
  • Program E2$149.99

Questions

Is NOFFS Sandbag free?
NOFFS Sandbag is free to download, with no in-app purchases.
Is BELLS, Kettlebell Workouts free?
BELLS, Kettlebell Workouts is free to download, with in-app purchases available.
Which has better reviews, NOFFS Sandbag or BELLS, Kettlebell Workouts?
NOFFS Sandbag is rated higher. NOFFS Sandbag averages 5.0 out of 5 from 4 ratings, while BELLS, Kettlebell Workouts averages 4.8 from 27 ratings.
Do NOFFS Sandbag or BELLS, Kettlebell Workouts have ads?
Neither NOFFS Sandbag nor BELLS, Kettlebell Workouts shows ads.
Which is updated more often, NOFFS Sandbag or BELLS, Kettlebell Workouts?
NOFFS Sandbag ships an update every 23 months, and BELLS, Kettlebell Workouts every 2 months. Most recently, NOFFS Sandbag was updated on October 22, 2026 and BELLS, Kettlebell Workouts on October 24, 2026.

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