Comparison

IntervalGuide vs Calorie Burndown

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

Head to head
About

IntervalGuide

Features
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Your workout. Your rules. IntervalGuide is a fully customizable interval timer for HIIT, Tabata, boxing, and circuit training - built to work exactly the way you train. Design your interval workout block by block: set work and rest periods, add rounds, choose audio cues, and train in the right heart rate zone. Shake your iPhone to pause or resume - no need to touch the screen mid-round. Whether you're doing HIIT, boxing rounds, kettlebells, running intervals, or strength-training rest periods, IntervalGuide adapts to your routine, not the other way around. HANDS-FREE CONTROL Shake your iPhone to pause or resume - no need to remove your gloves, stop your set, or fumble with your screen. Perfect for boxing, kettlebells, winter runs, or any workout where touching your phone isn't an option. FULLY CUSTOMIZABLE TIMERS Build workouts your way: - Create unlimited interval blocks with custom durations - Set work, rest, and preparation phases - Add rounds and repeats to any block - Assign colors to visually distinguish each phase - Save and reuse your favorite workouts REAL-TIME HEART RATE Connect your heart rate monitor and train in the right zone: - Polar sensors supported out of the box - Generic Bluetooth Low Energy (BLE) heart rate devices - Live HR display during workouts - Customizable heart rate zones - Apple Health integration AUDIO & HAPTIC CUES Stay focused without watching your screen: - Voice announcements for phase changes - Boxing bell and other sound effects - Vibration alerts to keep you on track - Works with headphones and AirPods APPLE WATCH COMPANION Control your workout from your wrist: - Start, pause, and stop from your Apple Watch - See timer and heart rate at a glance - Full data sync between iPhone and watch WORKOUT HISTORY Track your progress over time: - Automatic session logging - Review past workouts with full details - Heart rate data for every session - Apple Health sync BUILT FOR REAL TRAINING No bloat, no social features, no accounts required. Just a powerful, reliable interval timer that runs in the foreground and never quits on you mid-workout. Works great for: - Boxing & MMA rounds - HIIT & Tabata - Strength training rest periods - Yoga & stretching flows - Running intervals - CrossFit-style WODs - Physical therapy exercises Download IntervalGuide and build the interval timer that fits your training - not someone else's. SUBSCRIPTION IntervalGuide Premium removes all ads, unlocks your full workout history with detailed session stats and HR charts, and lets you export sessions as CSV, Excel, JSON or Text. - IntervalGuide Premium: auto-renewing monthly subscription - Free for the first week for new subscribers, then the price shown in the app - Payment is charged to your Apple Account at confirmation of purchase - Renews automatically unless cancelled at least 24 hours before the end of the current period - Manage or cancel anytime in your Apple Account settings Terms of Use (EULA): https://tremia.app/apps/interval-guide/terms-of-service Privacy Policy: https://tremia.app/apps/interval-guide/privacy-policy

About

Calorie Burndown

Features
Read full description

Calorie Burndown answers one question the Health app doesn't: given what you've eaten and burned today, how much room do you have left? It reads those numbers straight from HealthKit, does the arithmetic against a goal you set, and shows the answer on your phone, your Lock Screen, and your wrist. WHAT YOU'LL NEED Calorie Burndown doesn't log food and doesn't estimate your metabolism โ€” it reads what's already in Health. So you'll want a calorie-tracking app writing what you eat to Health, and an Apple Watch recording what you burn. If you already track both, this turns them into a number neither one gives you. If you don't, this app has nothing to read and won't be much use. EVERY FEATURE IS FREE No paywall, no subscription, nothing locked. The in-app purchases are optional tips โ€” they unlock nothing, and the app behaves identically whether or not you ever use them. WORKS EVERYWHERE YOU DO - iPhone app with an iPad-optimized layout - A home screen widget that shows your remaining budget at a glance - Lock Screen widgets, so it's there without unlocking - A watchOS companion app with real-time numbers, even without your phone nearby - Watch face complications and Smart Stack widgets BUILT ON HEALTHKIT, NOT A SEPARATE DATABASE There's no food database here, no barcode scanner, and no second place to log things. Keep using whatever app you already use; Calorie Burndown reflects it automatically. Your health data is read on your device and never leaves it โ€” there is no account, no server, and nothing to sign up for. YOUR WATCH WORKS ON ITS OWN The Watch app queries HealthKit directly, independent of your phone, so you get a real-time deficit number on a run or at the gym even if you left your phone at home. Settings and progress stay in sync across devices whenever they're near each other. WEEKLY CHECK-IN AND TRENDS A simple weekly check-in helps you see the bigger trend, not just today's number, and History charts your weight against the pace your target implies. IF YOU WANT TO SAY THANKS Settings has a tip jar with three sizes. That is the only place money is ever mentioned. It grants no features, removes no limits, and nothing in the app changes if you skip it. Calorie Burndown does not diagnose, treat, or provide medical advice โ€” it's a simple deficit calculator built on data you're already tracking in Health.

Screenshots

IntervalGuide4 screens
Calorie Burndown3 screens

Verdict

The call

The clearest difference is ads: Calorie Burndown at none against IntervalGuide's shown. Calorie Burndown also leads on update cadence (every 3 days vs every 11 days). IntervalGuide's advantage is iOS requirement (16.0 vs 26.5). On price, 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. IntervalGuide sells 1 in-app purchase, starting at $2.99 per month and Calorie Burndown sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

IntervalGuide ships an update every 11 days, Calorie Burndown every 3 days. The most recent releases landed on September 28, 2026 and October 9, 2026 respectively.

Scorecard3 real differences ยท 3 level
IntervalGuide versus Calorie Burndown: the parameters behind the verdict, then further details
ParameterIntervalGuideCalorie Burndown
PriceFreeFree
Update frequencyEvery 11 daysEvery 3 days โ€” better
AdsYesNo โ€” better
In-app purchasesYesYes
DevicesiPhone, iPad, Apple WatchiPhone, iPad, Apple Watch
Requires iOS16.0 โ€” better26.5
Further details โ€” not scored
Size54 MB6 MB
Age rating4+4+
DeveloperAmir TairiKevin McMahon

In-app purchases

1 purchases

IntervalGuide

Subscriptions1
  • IntervalGuide Premium7 Days trial$2.991 Month
3 purchases

Calorie Burndown

One-time3
  • Buy me a coffee$1.99
  • Buy me a few coffees$4.99
  • Buy the whole round$9.99

Questions

Is IntervalGuide free?
IntervalGuide is free to download, with in-app purchases available.
Is Calorie Burndown free?
Calorie Burndown is free to download, with in-app purchases available.
Do IntervalGuide or Calorie Burndown have ads?
IntervalGuide shows ads; Calorie Burndown does not.
Which is updated more often, IntervalGuide or Calorie Burndown?
IntervalGuide ships an update every 11 days, and Calorie Burndown every 3 days. Most recently, IntervalGuide was updated on September 28, 2026 and Calorie Burndown on October 9, 2026.

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