Fenn: Running Calorie Tracker
Eat More on the Days You Run
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Food and running on one ring: every run you finish adds to what you can eat today. See which muscles your runs worked. No ads, no account. Start with a 3-day free trial.
Run more, eat more that day. Fenn puts the calories you eat and the calories you burn running on one ring, on one screen.
Log a meal, go for a run, and watch your food budget grow with every run.
No ads. No account. Your diary is stored on your iPhone.
Most apps only do half the job. Calorie counters make you import workouts from somewhere else, and running apps never ask what you ate. Fenn does both: the lime arc is what you ate, the orange arc is what your runs burned.
FOOD LOGGING THAT KEEPS UP WITH YOU
• Snap a photo of your meal and let Fenn recognize it
• Scan a barcode to pull nutrition from Open Food Facts (coverage varies by product)
• Search a built-in food catalog that works offline
• Save your own recipes and log them in one tap
• Quick-add calories when you don't want the detail
• Meal, water and streak reminders that fit your day
RUNNING, MEASURED HONESTLY
• GPS run tracking with a live route map on Apple Maps
• Net calories, not gross: Fenn uses the ACSM running equation and leaves out the resting burn that's already in your daily target, so it isn't counted twice
• GPS noise filtering, so a phone sitting still doesn't add distance
• Splits, pace, elevation and your full run history
• Audio cues while Fenn is in use, plus a Live Activity on your Lock Screen
• Share your route drawn over your own photo
NEW: MUSCLE MAP
See which muscles your runs worked, front and back. The detailed view is part of Pro.
A PLAN THAT MEETS YOU WHERE YOU ARE
• A weekly running plan based on your current level
• Today's workout waiting on your Home Screen
PROGRESS YOU CAN READ AT A GLANCE
• Weight, calorie and macro trends
• A weekly report, streaks and a clear calorie breakdown
• A Home Screen widget with one-tap water logging
WORKS WITH APPLE HEALTH
Fenn reads your weight and steps and saves your runs back as workouts.
THE MATH BEHIND YOUR TARGET
Your daily calorie target starts from the Mifflin-St Jeor equation and your TDEE, then adjusts for your goal: lose weight, build muscle, improve endurance or stay fit. Choose more than one and Fenn combines them properly. Losing fat while building muscle is a recomposition, not a doubled deficit.
PRIVATE BY DESIGN
No account, no sign-up and no ads. Your diary is stored on your iPhone, and meal photos are sent only for recognition. Export everything anytime as JSON or CSV.
FENN PRO
Fenn is subscription-only; there is no free tier. Every plan starts with a 3-day free trial. Choose monthly or yearly, or buy lifetime once. Monthly and yearly plans renew automatically unless you cancel at least 24 hours before the current period ends. Manage or cancel anytime in Settings > [your name] > Subscriptions.
Fenn is a tracking tool, not a medical device, and its numbers are estimates. Talk to a doctor or registered dietitian before making big changes to your diet or training.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://mathwake.com/privacy
• New muscle map: see which muscles your runs worked
• A fresh, faster onboarding
• Route maps now use Apple Maps
• Apple Health fixes: watch workouts are no longer counted twice, and weight syncs correctly
• Faster, more consistent numbers across the app, widget and Live Activity
The developer, Ali Eser Koca, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- User Content
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ali Eser Koca
- Size
- 54.2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
English and 9 more
- English, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Turkish
- Age Rating
13+
- 13+
- Infrequent
Alcohol, Tobacco, Drug Use or References
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Fenn Pro — Lifetime $39.99
- Fenn Pro — Monthly $4.99
- Fenn Pro — Yearly $19.99
- Copyright
- © Eser Koca