Comparison

J vs WhittleStrength

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

Head to head
About

J

This app provides tools to structure your juggling practice sessions, including warm-up, practice, and cool-down routines. It features interval training for customized workouts and a talking timer for endurance practice, offering verbal feedback without needing to check your stopwatch.

Highlights
  • Structured practice routines (warm-up, practice, cool-down)
  • Customizable interval training workouts
  • Talking timer for endurance practice
  • Verbal feedback for endurance contests
  • Ad-free experience
Features
Read full description

Enhance your juggling practice! The J-Trainer app will give you tools to ensure that your juggling practice sessions include proper warmup, practice, and cool down. The interval training portion of the J-Trainer tool allows you to build customized workouts to ensure you spend the right amount of practice time on each section of your practice. Most juggling festivals include endurance contests like: club balance endurance, 5 ball endurance, 5 club endurance, and quarter juggling endurance. The Talking Timer feature of the J-trainer gives you verbal feedback on your endurance, so you don't have to look down at your stop watch. ---------------------------- No advertisements and no in app purchases are contained in this app. ---------------------------- Other apps by this developer: Protect TD (Protect Tower Defense - Save the Animals) Math Tower Defense Eagle Mandarin Mandarin Prof Math Town Spelling Ace Spy Town Spanish Prof ---------------------------- I hope you enjoy this app. Feel free to send me feedback if you have suggestions for future updates.

About

WhittleStrength

This app provides personalized workout programs and detailed tracking for your fitness journey. Monitor progress, optimize recovery, and manage nutrition with integrated tools. Connect with a supportive community and coaches for motivation.

Highlights
  • Personalized training programs
  • Workout set, rep, and tempo tracking
  • Exercise library with cues
  • Nutrition and habit tracking
  • Wearable device integration
  • Community support and coaching
Features
Read full description

Welcome to the TRI HARDER Training App by WhittleStrength. With the TRI HARDER Training App subscription you can follow any of our proven training programs anywhere in the world! Take control of your fitness journey with the TRI HARDER Training App. Our cutting-edge platform delivers personalized workouts directly to your phone. Experience a seamless integration that empowers you to monitor every aspect of your success – from recording training PRs and tracking sets, reps, and tempo, to optimizing recovery. Plus, take charge of your nutrition with our user-friendly in-app nutrition tracker. It's time to level up your training experience and TRI HARDER! What’s inside the TRI HARDER Training App: - Elevate Your Training: Navigate through your selected training program and track your sets, reps and tempo for each exercise to maximize your progress in the gym. - Perfect Your Form: Full access to the TRI HARDER Training App exercise library with set-up and execution cues for every exercise in each program. - Mastering Tempo for Maximum Results: Our programs are meticulously designed with a focus on tempo – the controlled pace of each movement. By honing in on the intricacies of timing, our clients not only enhance their strength, hypertrophy, and fat loss but also elevate their overall performance. - Accountability Metrics: Stay accountable and track your nutrition, activity, and sleep with our detailed tracking platform. - Connectivity: Connect to other wearable devices and apps like the Apple Health App, Garmin, Fitbit and MyFitnessPal to track your workouts, sleep, nutrition, and body stats and composition. Other Features: - Track your meals and make better food choices. - Stay on top of your daily habits. - Set health and fitness goals and track progress towards your goals. - Gain milestone badges for achieving new personal bests and maintaining habit streaks. - Message your coach in real-time. - Be part of digital communities to meet people with similar health goals and stay motivated. - Track body measurements and take progress photos. - Get push notification reminders for scheduled workouts and activities. - Connect your Apple Watch to track workouts, steps, habits, and more right from your wrist. NOT JUST AN APP, A COMMUNITY: ENCOURAGEMENT, MOTIVATION AND SUPPORT. IMPORTANT NOTE: An online account is required to use this app. If you’re a client, reach out to us (your coach) for your account details so you can login to this app. Visit our website for more details. Download the app today!

Screenshots

J4 screens
WhittleStrength4 screens

Verdict

The call

The clearest difference is iOS requirement: J at 12.2 against WhittleStrength's 15.0. On price, rating, review sentiment and ratings volume 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for J against 5.0 for WhittleStrength. Both are backed by a comparable volume of ratings — 4 and 8 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

J ships an update monthly, WhittleStrength every 6 weeks. The most recent releases landed on June 1, 2026 and September 14, 2026 respectively.

Scorecard1 real difference · 9 level
J versus WhittleStrength: the parameters behind the verdict, then further details
ParameterJWhittleStrength
PriceFreeFree
Rating5.0 (4 ratings)5.0 (8 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings48 — better
Update frequencyMonthly — betterEvery 6 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS12.2 — better15.0
Further details — not scored
Size19 MB172 MB
Age rating4+4+
DeveloperHeather MarriottWhittleStrength LLC

Customer experience

J

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

WhittleStrength

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

J

No in-app purchases

None

WhittleStrength

No in-app purchases

Questions

Is J free?
J is free to download, with no in-app purchases.
Is WhittleStrength free?
WhittleStrength is free to download, with no in-app purchases.
Which has better reviews, J or WhittleStrength?
J and WhittleStrength are both rated 5.0 out of 5 on the App Store, from 4 and 8 ratings respectively.
Do J or WhittleStrength have ads?
Neither J nor WhittleStrength shows ads.
Which is updated more often, J or WhittleStrength?
J ships an update monthly, and WhittleStrength every 6 weeks. Most recently, J was updated on June 1, 2026 and WhittleStrength on September 14, 2026.

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