Carbon vs Source Performance
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Carbon
This app provides personalized nutrition plans for weight loss, muscle gain, or maintenance. It adapts your plan as you progress and offers a comprehensive food tracker with a large database and barcode scanner. It supports various diet preferences and allows for custom meal planning.
- Personalized nutrition plans
- Adaptive plan adjustments
- Comprehensive food logging
- Barcode scanner
- Diet preference customization
- Diet planner for flexible eating
Read full descriptionHide full description
Carbon Diet Coach is your nutrition solution for results that LAST. Whether your goal is to lose fat, build muscle, improve your metabolism, or simply maintain your weight, Carbon Diet Coach removes the guesswork. Carbon Diet Coach is a science-based nutrition app designed by renowned nutrition coaches Dr. Layne Norton (Ph.D. Nutritional Sciences) and Registered Dietitian Keith Kraker (BS Dietetics). It does everything a normal nutrition coach would but at a fraction of the cost. Simply select your goal, answer a few short questions, and it does the rest! You will get a customized nutrition plan based on YOUR goals and metabolism. What's more, Carbon will adjust the plan as you progress to optimize your results. If you hit a plateau or stall, Carbon will make adjustments to keep you progressing towards your goal, just like any good coach would. Our coaching system uses the latest techniques in nutrition science to make sure you get the best results possible. All you need to do is follow these simple steps: ∙ Log your food using the built-in food tracker ∙ Log your body weight ∙ Check-in each week Do that and Carbon does the rest! Carbon Diet Coach can do things other nutrition coaching apps can’t do. For example, your nutrition plan can be tailored to your diet preference: ∙ Balanced ∙ Low Carb ∙ Low Fat ∙ Ketogenic ∙ Plant-Based Each setting is completely customizable so that you receive a plan that is sustainable for YOU! Another feature that makes Carbon unique is the diet planner. Want high and low-calorie days rather than eating the same foods every day? Use the diet planner to set up your week and stay on track. Overate on one day and not sure what to do with your nutrition plan for the rest of the week? Adjust the diet planner to account for what you overate and Carbon does the rest! Other coaching features include: ∙ Adjustable check-in days ∙ Check-in explanations so you're never left wondering why the app did or didn’t make a change ∙ Check-in history so you can look back and see why the app made various adjustments ∙ Charts showing your weight, body fat, lean body mass, calorie intake, protein intake, carbohydrate intake, fat intake, and metabolic rate ∙ Early check-in feature for those who can’t always check in on their specified day ∙ Goal tracker so you can see the progress you’ve made and how close you are to your goal ∙ Recommendations after you reach a goal so you can plan for what's next and KEEP your results ∙ Integrates with Apple Health to automatically read Body Weight and Body Fat values Already know what you are doing with nutrition and don’t need Carbon to coach you? No problem, you can enter your nutrition targets and simply use the food tracker. Beyond the amazing coaching features of this app is a food tracker that's excellent in its own right. Its features include: ∙ A huge food database ∙ Barcode scanner ∙ Quick add macros ∙ Copy meals ∙ Favorite foods ∙ Create custom foods ∙ Create custom recipes No matter what your goal is, Carbon Diet Coach is your solution. Simple. Scientific. Sustainable. App Subscriptions: ∙ Monthly ∙ 6 Months ∙ Yearly The subscription period will automatically renew unless auto-renew is turned off at least 24 hours before the end of the current subscription period. To turn this function off, simply go to your iTunes account and turn off auto-renew. Renewal payments will differ depending on subscription and pricing at the time of renewal. Your iTunes account will be charged when the purchase is confirmed. Food database powered by FatSecret: https://fatsecret.com Terms and Conditions: https://joincarbon.com/terms-and-conditions/ Privacy Policy: https://joincarbon.com/privacy-policy/
Source Performance
This app provides personalized workout programs and tracks your fitness journey. Monitor workouts, nutrition, habits, and measurements with coach support. Achieve your health goals with guided exercises and progress tracking.
- Access and track training plans
- Follow exercise and workout videos
- Track meals and food choices
- Monitor daily habits
- Set and track health goals
- Message your coach in real-time
- Track body measurements and progress photos
Read full descriptionHide full description
With the Source Performance App, you will have access to workout programs designed specifically to help you reach your fitness and health goals! You can follow & track your workouts, your nutrition, your lifestyle habits, measurements and results–all with the help of your coach. FEATURES: - Access training plans and track workouts - Follow along to exercise and workout videos - 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 - 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 - Connect to other wearable devices and apps like the Apple Health App, Garmin, Fitbit, MyFitnessPal, and Withings devices to track workouts, sleep, nutrition, and body stats and composition Download the app today!
Screenshots
Verdict
The clearest difference is in-app purchases: Source Performance at none against Carbon's 9. Source Performance also leads on review sentiment (100% vs 80%) and rating (5.0 vs 4.8). Carbon's advantage is update cadence (weekly vs every 2 months) and ratings volume (8K vs 9). On price, ads and iOS requirement 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. Carbon sells 9 in-app purchases, starting at $11.99 per month. Source Performance asks for nothing beyond the download.
Source Performance holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Carbon has 8K ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 80% of Carbon's written reviews are positive against 100% of Source Performance's.
Carbon ships an update weekly, Source Performance every 2 months. The most recent releases landed on September 29, 2026 and September 18, 2026 respectively.
| Parameter | Carbon | Source Performance |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (8K ratings) | 5.0 (9 ratings) — better |
| Positive reviews | 79.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 8K — better | 9 |
| Update frequency | Weekly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | #105 — better | — |
| Devices | iPhone | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 16.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 106 MB | 180 MB |
| Age rating | 17+ | 4+ |
| Developer | Reform LLC | Source Performance LLC |
Customer experience
Carbon
Source Performance
Bugs and requests
Carbon
Reported bugs
2 issues- Occasional app crashes or freezes
- Issues with resetting account data
Requested features
4 requests- Add water intake tracking
- Improve barcode scanning functionality
- Allow more flexibility in macro adjustments
- Integrate with fitness trackers
Source Performance
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Carbon
- Monthly Subscription$11.991 Month
- Monthly Subscription7 Days trial$11.991 Month
- Monthly Subscription14 Days trial$11.991 Month
Show 6 moreShow fewer
- Six Month Subscription$59.996 Months
- Six Month Subscription7 Days trial$59.996 Months
- Six Month Subscription14 Days trial$59.996 Months
- Yearly Subscription$99.991 Year
- Yearly Subscription7 Days trial$99.991 Year
- Yearly Subscription14 Days trial$99.991 Year
Source Performance
No in-app purchases
Questions
Is Carbon free?
Is Source Performance free?
Which has better reviews, Carbon or Source Performance?
Do Carbon or Source Performance have ads?
Which is updated more often, Carbon or Source Performance?
Other comparisons















