One Day Diet vs Jym
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
One Day Diet
This app helps you gamify healthy eating by tracking your diet based on a system designed for healthier food choices. It allows for personal target setting and includes additional tracking for macronutrients and hydration. Coupled with exercise, it aims to support weight loss.
- Gamified healthy eating tracking
- Personalized diet target setting
- Macronutrient tracking
- Hydration tracking
- Based on 'Racing Weight' principles
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Gamify healthy eating! This app provides tracking for a diet system based roughly on one outlined in Racing Weight: How to Get Lean for Peak Performance by Matt Fitzgerald. As translated, this diet is intended to simply get you eating healthier foods. Coupled with adequate exercise, weight loss will likely follow. To begin, eat what you consider to be "well" for a day or a few, note those scores, and there's your personal target. Additional macronutrient and hydration tracking is available as well.
Jym
Log your gym workouts with a straightforward and easy-to-use interface. Track weight, reps, and sets, and visualize your progress over time with insightful graphs. Stay motivated with daily activity logs and workout-specific streak tracking.
- Workout tracking with autofill
- Weight improvement graphs
- Daily activity log
- Workout day-specific streak tracking
- Historically inspired UI
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Jym is differs from other workout log apps in that it only focuses what is necessary. The UI is straightforward and easy to use. You add your workout days, workouts for each day, and view graphs to see how you have improved over the length of weeks or months. Whether you are a seasoned workout gym bro or a new fitness pioneer trying to keep track of progress over time, this app is made for you! WORKOUT TRACKING Track your workouts each day! On your workout day, a workout form will autofill with your workout weight, reps, and sets from your previous day. Simply press the Record button to log a workout for that day or change a parameter to track your growth. WEIGHT IMPROVEMENT For each workout, see your how you have improved over time! The graphs track the weight associated with each workout and averages them across each week. See your improvements and consistency over the past year. DAILY ACTIVITY LOG A daily activity log appears on the main screen of the Charts tab. It displays the total number of sets performed across all of your workouts. It helps keep track of how active each workout day is and how often you attend the gym. WORKOUT DAY-SPECIFIC STREAK TRACKING Jym also provides a streak tracking feature for each workout day. The streaks are displayed in a circle chart, where working out 10 consecutive weeks yields a full circle. Hold a continuous 10-week streak for your top four workout days to fill up the circles! HISTORICALLY INSPIRED UI We wanted to design an app that was beautiful to look at, which allows the experience of using a workout app not just be a chore. Our schemes and visuals are heavily inspired from ancient Greek and Egyptian art. The color schemes for our streaks chart is inspired by European star charts from the 15th-18th centuries.
Screenshots
Verdict
The clearest difference is update cadence: One Day Diet at every 2 days against Jym's every 7 months. 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for One Day Diet against 5.0 for Jym. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
One Day Diet ships an update every 2 days, Jym every 7 months. Both last shipped on October 13, 2026.
| Parameter | One Day Diet | Jym |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 2 | 2 |
| Update frequency | Every 2 days — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 17.0 | 16 — better |
| Further details — not scored | ||
| Size | 1 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Michael Collins | Jason Chen |
Customer experience
One Day Diet
Jym
In-app purchases
One Day Diet
No in-app purchases
Jym
No in-app purchases









