Comparison

Caffeine Rhythm vs CalShift

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

CalShift

Features
Read full description

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

Caffeine Rhythm4 screens
CalShift4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

Caffeine Rhythm ships an update monthly, CalShift every 3 months. The most recent releases landed on September 24, 2026 and September 10, 2026 respectively.

Scorecard3 real differences · 7 level
Caffeine Rhythm versus CalShift: the parameters behind the verdict, then further details
ParameterCaffeine RhythmCalShift
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyMonthly — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPod
Requires iOS17.013.0 — better
Further details — not scored
Size23 MB30 MB
Age rating4+4+
DeveloperHatching Point LLCZhihao Yang

In-app purchases

2 purchases

Caffeine Rhythm

Subscriptions2
  • Monthly Premium7 Days trial$1.991 Month
  • Yearly Premium7 Days trial$9.991 Year
1 purchases

CalShift

One-time1
  • Unlock Shift Pro$0.99

Questions

Is Caffeine Rhythm free?
Caffeine Rhythm is free to download, with in-app purchases available.
Is CalShift free?
CalShift is free to download, with in-app purchases available.
Do Caffeine Rhythm or CalShift have ads?
Caffeine Rhythm shows ads; CalShift does not.
Which is updated more often, Caffeine Rhythm or CalShift?
Caffeine Rhythm ships an update monthly, and CalShift every 3 months. Most recently, Caffeine Rhythm was updated on September 24, 2026 and CalShift on September 10, 2026.

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