Comparison

Fartlek vs Caloroo

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

Head to head
About

Fartlek

Features
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Tell your AI coach your goal and the days you can run, and get a training plan that adapts every week to how your runs go. Need a single workout? Describe it or paste a screenshot, and it's ready in seconds. Then just run: voice and haptic cues guide every interval, even with your screen off. 25 workouts runners actually love โ€” HIIT, fartlek, tempo, hills, Yasso 800s. On iPhone and Apple Watch. Because running the same pace every day only makes you better at running the same pace. Break the plateau. EVERY RUN IS A NEW CHALLENGE Every workout here has a specific goal and a different feel โ€” so you actually train different muscles, systems, and skills instead of just logging miles. Your running workout is fun now :) Speed: 200m pops, ladders, strides, sprint finishers Strength: Hill repeats, power builders, switchbacks Stamina: HIIT, Cruise intervals, tempo waves, Yasso 800s Endurance: Progressive aerobic, negative splits, scenic cruises Fun: Fartlek games, stoplight play, music flow runs Each workout has a warm-up, main set, and cooldown โ€” with clear effort guidance through every phase. AI WORKOUT GENERATOR Tell the AI coach what you want โ€” "30 minutes, hill repeats, moderate" or "a fartlek that doesn't bore me" โ€” and get a runnable workout in seconds. Paste a screenshot of a workout you saw online and we'll convert it into intervals. TRAIN BY EFFORT, NOT NUMBERS Every interval shows a target effort (80% for work, 30% for recovery). No heart rate monitor needed. GPS pace lies anyway โ€” effort just works better. AUTO-LAP BY DISTANCE OR TIME Distance intervals auto-complete when you hit 200m, 400m, 800m, or whatever target you set. Time intervals count down with precision. No fumbling with lap buttons mid-stride. AUDIO & HAPTIC CUES Get notified at interval start, halfway, and end. Works with your screen off, works on Apple Watch. Built for running outside, where you can't keep glancing at a screen. APPLE WATCH COMPANION Run straight from your wrist. Leave your phone behind for track sessions โ€” the Watch app handles everything on its own. CLEAN, GET-OUT-OF-THE-WAY DESIGN Big, glove-friendly controls. Dark mode. One-screen run view with your current interval front and center, and what's next right there too. AFTER YOUR RUN Review every completed interval โ€” distance, time, pace. Auto-syncs to Apple Health. WORKOUT TYPES Tempo: Sustained-effort training Intervals: Structured speed work Fartlek: Mixed-pace playful running Hills: Uphill repeat sessions Long Run: Extended endurance efforts 3 DURATION OPTIONS Quick (10โ€“15 min): Short, sharp sessions Standard (20โ€“35 min): Complete workouts Long (40โ€“60+ min): Extended training WHO IT'S FOR - Runners looking to improve their times - Runners who like variety and fun - Amateur athletes who want to gain leg strength and power - Anyone looking to improve overall fitness and health - Anyone looking to lose weight with HIIT (High-Intensity Interval Training) - Anyone who wants to run intervals without 10 minutes of setup - Anyone tired of complex running apps that feel more like Instagram No social feeds. No data mining. Just running. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Caloroo

Features
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Caloroo โ€” calorie tracking you do together. Tracking alone is why most people quit. Caloroo is built around the people who keep you going. Share your progress with a coach, train alongside friends, or keep your family on track โ€” together, you actually stick with it. SHARE WITH YOUR COACH Give your coach, trainer, or nutritionist a live view of your calories, macros, and weekly progress. They follow along and adjust your plan without endless screenshots or check-in texts. You control exactly what they see. TRACK AS A GROUP Create or join groups with friends and family. See each other's progress, stay motivated, and hold each other accountable. Group admins manage who's in โ€” you choose what you share and with whom. PRIVACY ON YOUR TERMS Sharing is always your call. Pick what's visible, share by link or group, and keep the rest private. Your data lives on your device first and works fully offline. SMART WEEKLY BUDGETING Under the hood, Caloroo tracks calories across the whole week โ€” not just today. A big dinner on Friday is just calories you borrow from the rest of the week. Choose a rolling 7-day window or a calendar week, and Caloroo projects where you'll land. MACROS MADE CLEAR Track carbs, protein, and fat alongside calories, with protein progress built right into your main budget card. FAST LOGGING, LESS TYPING Log a meal in seconds. Favorites and recent foods surface automatically. Add portions in grams, ml, packs, slices, cups, tbsp, and more. Snap a photo now, fill in the details later. TARGETS BUILT FOR YOU A quick setup calculates your BMR, maintenance calories, and a personalized daily target for your goal โ€” lose, maintain, or gain. Fine-tune anytime. CONNECTS TO YOUR LIFE โ€ข Apple Health โ€” pull in steps, active energy, and workouts โ€ข Sync securely across your devices MORE โ€ข Daily and weekly stats with trends โ€ข Custom, color-tagged meal types โ€” no rigid breakfast/lunch/dinner buckets โ€ข Offline-first Download Caloroo and reach your goals with the people who keep you on track. โ€”โ€”โ€”โ€” SUBSCRIPTION Caloroo Premium is an auto-renewable subscription, offered monthly and annually. Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours prior to the end of the period. Manage or cancel anytime in your App Store account settings. Any unused portion of a free trial is forfeited when you purchase a subscription. Terms of Use (EULA): https://caloroo.app/en/terms Privacy Policy: https://caloroo.app/en/privacy

Screenshots

Fartlek4 screens
Caloroo3 screens

Verdict

The call

The clearest difference is update cadence: Fartlek at every 4 days against Caloroo's fortnightly. Caloroo's advantage is iOS requirement (15.5 vs 18.5). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Fartlek sells 3 in-app purchases, starting at $1.99 per 7 days and Caloroo sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Fartlek ships an update every 4 days, Caloroo fortnightly. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

Scorecard2 real differences ยท 4 level
Fartlek versus Caloroo: the parameters behind the verdict, then further details
ParameterFartlekCaloroo
PriceFreeFree
Update frequencyEvery 4 days โ€” betterFortnightly
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, Apple WatchiPhone, iPad, iPod โ€” better
Requires iOS18.515.5 โ€” better
Further details โ€” not scored
Size29 MB124 MB
Age rating4+17+
DeveloperAxis SADima Labs Inc.

In-app purchases

3 purchases

Fartlek

Subscriptions3
  • Weekly Plan$1.997 Days
  • Monthly premium$4.991 Month
  • Yearly Premium3 Days trial$29.991 Year
2 purchases

Caloroo

Subscriptions2
  • Personal Premium Monthly$7.991 Month
  • Personal Premium7 Days trial$59.991 Year

Questions

Is Fartlek free?
Fartlek is free to download, with in-app purchases available.
Is Caloroo free?
Caloroo is free to download, with in-app purchases available.
Do Fartlek or Caloroo have ads?
Neither Fartlek nor Caloroo shows ads.
Which is updated more often, Fartlek or Caloroo?
Fartlek ships an update every 4 days, and Caloroo fortnightly. Most recently, Fartlek was updated on October 26, 2026 and Caloroo on October 28, 2026.

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