Caffeine Tracker vs Whistle
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Caffeine Tracker
Log your caffeine intake from various beverages and understand its impact on your sleep and health. Get personalized 'Last Call' times and track trends with detailed charts and AI-powered custom drink analysis.
- Log various caffeine sources
- Predict caffeine-free times
- Calculate bedtime caffeine levels
- Personalized 'Last Call' alarms
- Analyze caffeine's impact on sleep
- Custom drink creation with AI
- Detailed charts and graphs
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Alyx is a silly way to track caffeine. Quickly log espresso, lattes or anything else and see how it affects your health, sleep or view other interesting stuff! It uses Apple Health to store your data privately, which means it also syncs with iCloud. Of course, you can log caffeine here. Aside from being a coffee, espresso, energy drink, or general caffeine tracker and journal, there are some interesting things it can do: - Figure out when your body will be caffeine free. - Discover how much caffeine will be in your body at bedtime. - Get your customized "Last Call" for caffeine every day, and set an alarm for it! - See how caffeine consumption impacts the amount of sleep you get. - View how caffeine will decline in your body over the next 12 hours. - See if your caffeine consumption has been trending up or down lately. - Tons of Siri Shortcuts. - Tons of widgets! - Create your own custom drinks, and have AI figure out the caffeine contents! - A Hall of Fame for...caffeine consumption? - Um, what else? Oh, tons of charts! So yeah, you can see how caffeine affects your sleep, overall health, see how much sleep you'll lose, and more. I don't know, it's just a fun app. Download it or don't. Love, Alyx -- SUBSCRIPTION & PREMIUM FEATURES -- Most of Alyx is completely free to use. There are premium features if you upgrade to The Caffeine Club, which includes every widget, adding your own custom drinks, several charts, and sleep forecast features. -- LEGAL -- · View our terms of service here: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ · View our privacy policy here: https://alyxcaffeinetracker.com/privacy/ Subscriptions will be charged to your credit card through your iTunes account. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. You will not be able to cancel the subscription once activated. Manage your subscriptions in Account Settings after purchase.
Whistle
This AI-powered app creates personalized training plans for running, cycling, swimming, and strength exercises. It adapts to your schedule and goals, providing insights into your training load, recovery, and progress. Seamlessly integrates with Apple Watch and HealthKit for comprehensive data analysis.
- AI-driven personalized training plans
- Adaptive workout adjustments
- Progress tracking and insights
- Integration with Apple Watch and HealthKit
- Weather-aware planning
- Privacy-first data handling
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Whistle is an AI training planner for running, cycling, swimming, strength work, and everything in between. Build a plan around your goals, adapt it when life changes, and understand what your training is doing over time. Plan with a coach that understands your week Ask Whistle to build a training week, create a longer program, adjust a workout, review your progress, or explain what your body is telling you. Your coach can use your goals, schedule, recent workouts, recovery, sleep, vitals, and local weather to help you make better training decisions. Training programs, not just single workouts Start a guided setup, tell Whistle what you are training for, and get a structured program you can follow week by week. Already following a plan? Bring that structure into Whistle and let your coach help you keep it organized. Workout planning that stays flexible Plan workouts for today, the week ahead, or a longer training block. Create structured sessions with warmups, intervals, targets, cooldowns, and activity-specific goals. Save workouts as templates so repeated sessions are ready when you need them. Train with better context Whistle turns workout and health data into practical planning support: - Training load to understand how much work you are absorbing - Projected load to see how planned workouts may shape your week - Recovery, sleep, and vital trends for daily context - Workout predictions for distance, duration, calories, and load - Training insights, heatmaps, and streaks to review consistency over time - Weather-aware planning with multi-day forecasts for outdoor sessions Apple Watch ready Send planned workouts to Apple Watch and start them from your wrist. Whistle also works with Apple’s Workout app experience, so your sessions fit into the tools you already use. Works with Apple Health (HealthKit) When you choose to share Apple Health data, Whistle can use workouts, activity, heart rate, recovery, sleep, and vitals to make planning and coaching more personal. The goal is useful training insight, not medical advice. Built privacy-first No account is required. Your workout and health data are handled with care, stored locally and in your personal iCloud where possible, and used only to power the features you choose. When AI processing is needed, Whistle uses the data required for the task instead of building a long-term personal profile on our servers. Some features require Pro or Ultra. Health, weather, watch, and AI features depend on device capabilities, permissions, region, and data availability.
Screenshots
Verdict
The clearest difference is rating: Caffeine Tracker at 4.9 against Whistle's 4.3. Caffeine Tracker also leads on review sentiment (79% vs 50%) and update cadence (every 5 days vs monthly). Whistle's advantage is device support (3 vs 1) and iOS requirement (18 vs 26.0). On price, ads, in-app purchases and monetization model 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. Caffeine Tracker sells 4 in-app purchases, starting at $1.99 per month and Whistle sells 5 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Caffeine Tracker holds the better App Store score, 4.9 against 4.3. Both are backed by a comparable volume of ratings — 41 and 11 respectively. Written reviews point the same way: 79% of Caffeine Tracker's written reviews are positive against 50% of Whistle's.
Caffeine Tracker ships an update every 5 days, Whistle monthly. Both last shipped on November 8, 2026.
| Parameter | Caffeine Tracker | Whistle |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (41 ratings) — better | 4.3 (11 ratings) |
| Positive reviews | 78.9% of reviews — better | 50.0% of reviews |
| Number of ratings | 41 — better | 11 |
| Update frequency | Every 5 days — better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad, Apple Watch — better |
| Requires iOS | 26.0 | 18 — better |
| Further details — not scored | ||
| Size | 45 MB | 100 MB |
| Age rating | 4+ | 17+ |
| Developer | Day Well Spent LLC | Vogelhaus Apps GmbH |
Customer experience
Caffeine Tracker
Whistle
In-app purchases
Caffeine Tracker
- Caffeine Club$1.991 Month
- Caffeine Club Annual$9.991 Year
- Caffeine Club Annual7 Days trial$9.991 Year
- Caffeine Club: Lifetime$24.99
Whistle
- Pro 1 Month$4.991 Month
- 1 Ultra Month$9.991 Month
- Ultra 3 Months3 Days trial$24.993 Months
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- Pro 1 Year7 Days trial$39.991 Year
- Ultra 1 Year$99.991 Year









