J vs Eros Scale
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
J
This straightforward fitness tracker focuses on recording your walks and runs. It accurately logs distance, time, and pace without unnecessary features or data collection. All your workout history is securely stored on your device.
- Tracks distance, time, and pace
- Simple, intuitive interface
- Workout history review
- Real-time progress display
- Robust and fault-tolerant design
- All data stored locally
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A super-simple app to track your walks and runs. It tracks your: Distance, Time, and Pace for each workout. That's it! I created this app for my wife who was baffled by the complex apps that are available this kind of thing. They all have dozens of features she has no interest in but still has to wade through and/or ads to try to click around. But she just wants to know how far and fast her walks or runs go. Although the app is simple, I've brought to bear the experience of 30+ years as a software engineer to this app. I've tried to make it as robust, fault-tolerent, and rock-solid as I reasonably could. (e.g., take any similar app and let it run out of power during your workout or simulate this by force-rebooting -- and look at what you end up with. With some other apps -- even Apple's very nice Workouts app for Apple Watch -- you'll end up with little to nothing. With J-Walker, you'll have your workout tracked up to the second your phone died.) Also, all your data stays on your phone. There's no data harvesting going on here, no advertisers, no "partners", no switcheroo. There's one screen to review workout history or start a workout. And another to show your progress during a workout. Simple.
Eros Scale
Connect your smart body fat scale to your smartphone to automatically track multiple users' health metrics. Monitor weight, body fat, muscle mass, and more with historical charts for easy progress viewing.
- Automatic smart scale connection
- Unlimited user tracking
- Comprehensive body composition metrics
- Historical progress charts
- Apple Health Kit integration
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Getting and staying fit has never been easier! The New Eros Scale APP allows you to automatically connect your Eros Smart Body Fat Scale with your preferred smartphone. Now you can track an unlimited number of users to monitor the health of you and your family from one convenient place. The best part is that Eros Smart Body Fat Scale will provide you with all the important body composition metrics, such as; body weight, body fat, body water, muscle mass, body mass index, basal metabolic rate, visceral fat, metabolic age, skeletal muscle, protein, fat-free body weight, and even subcutaneous fat so that you know exactly how you are doing in your fitness progress. Then easily see your historical charts at the click of a button… It is that simple! Begin living a healthier life today. Thank you for choosing Eros. *Supporting Apple Health Kit (only for iPhones with iOS8 or new version). Data includes Lean Body Mass, Height, Body Mass Index, Body Fat Percentage, Weight, Birthday and Gender will be automatically synchronized to Apple Health Kit.
Screenshots
Verdict
The clearest difference is review sentiment: J at 100% against Eros Scale's 25%. J also leads on rating (4.8 vs 3.1) and ads (none vs shown). Eros Scale's advantage is price (Free vs $0.99) and update cadence (every 4 months vs every 10 months). On in-app purchases 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
Eros Scale is free to download; J costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
J holds the better App Store score, 4.8 against 3.1. That said, the two scores are not equally well evidenced: Eros Scale has 38 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 100% of J's written reviews are positive against 25% of Eros Scale's.
J ships an update every 10 months, Eros Scale every 4 months. The most recent releases landed on September 21, 2026 and August 16, 2026 respectively.
| Parameter | J | Eros Scale |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.8 (4 ratings) — better | 3.1 (38 ratings) |
| Positive reviews | 100.0% of reviews — better | 25.0% of reviews |
| Number of ratings | 4 | 38 — better |
| Update frequency | Every 10 months | Every 4 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 9 MB | 40 MB |
| Age rating | 4+ | 4+ |
| Developer | John Mullaney | INEVIFIT LLC |
Customer experience
J
Eros Scale
In-app purchases
J
No in-app purchases
Eros Scale
No in-app purchases









