Caffeine Rhythm vs CalShift
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Caffeine Rhythm
Track your caffeine intake and understand its impact on your body. This app calculates your real-time caffeine levels and predicts when you'll be able to sleep, helping you optimize your daily consumption for better rest.
- Real-time caffeine decay tracking
- Personalized half-life calculation
- Sleep safety countdown
- Coffee shop menu integration
- Streak tracking and gamification
- Apple Watch app with complications
- Home Screen and Lock Screen widgets
- HealthKit integration
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Caffeine Rhythm is your personalized caffeine tracker for iPhone and Apple Watch. It uses your unique metabolism profile to calculate your real-time caffeine level and tell you exactly when you're safe to sleep. Whether you're optimizing your morning coffee routine or making sure that afternoon espresso won't keep you up, Caffeine Rhythm gives you the insights you need to make smarter caffeine choices every day. FEATURES: • Real-time caffeine decay tracking with personalized half-life • Sleep safety countdown — know when you're safe to sleep • Coffee shop menus — Starbucks, Dunkin', McCafé, Costa, Blue Bottle, Peet's, Dutch Bros • Streak tracking and gamification • Apple Watch app with complications • Home Screen and Lock Screen widgets • HealthKit integration — caffeine intake and sleep correlation • Live Activities and Dynamic Island • Smart weekly insights powered by AI SUBSCRIPTION INFORMATION: • Free trial available — try all premium features for 7 days before subscribing • Monthly plan: $2.99/month • Yearly plan: $19.99/year (best value) • Subscription automatically renews unless cancelled at least 24 hours before the end of the current period • Payment will be charged to your Apple ID account at the confirmation of purchase • You can manage and cancel your subscriptions by going to Settings > Apple ID > Subscriptions Privacy Policy: https://hatchingpoint.com/caffeinerhythm/privacypolicy Terms of Use: https://hatchingpoint.com/caffeinerhythm/terms
CalShift
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Tired of manually tracking rotating shifts? Cal Shift generates your work schedule in seconds. • 50+ pre-built templates — healthcare, firefighter, manufacturing, retail & more • Preview your entire schedule before importing to calendar • Custom shift patterns with unlimited flexibility HOW IT WORKS: 1. Choose from 50+ templates or create your own 2. Select your start date and cycle count 3. Preview your schedule on the calendar 4. One-tap to write to your device calendar 5. Done! Your shifts are now in your calendar Stop calculating shifts manually. Download Cal Shift and take control of your work schedule today!
Screenshots
Verdict
The clearest difference is ads: CalShift at none against Caffeine Rhythm's shown. CalShift also leads on iOS requirement (13.0 vs 17.0). Caffeine Rhythm's advantage is update cadence (monthly vs every 3 months). On price, in-app purchases and device support 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 Rhythm sells 2 in-app purchases, starting at $1.99 per month and CalShift sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Caffeine Rhythm ships an update monthly, CalShift every 3 months. The most recent releases landed on September 24, 2026 and September 10, 2026 respectively.
| Parameter | Caffeine Rhythm | CalShift |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Monthly — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPod |
| Requires iOS | 17.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 23 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Hatching Point LLC | Zhihao Yang |
In-app purchases
Caffeine Rhythm
- Monthly Premium7 Days trial$1.991 Month
- Yearly Premium7 Days trial$9.991 Year
CalShift
- Unlock Shift Pro$0.99









