Comparison

Kraftvrk vs Caffeine Tracker

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

Head to head
About

Kraftvrk

Features
Read full description

Alt, du behøver til din træning – samlet i én app. Vores træningsapp er udviklet til at støtte og forbedre din træningsrejse ved at samle alle de nødvendige funktioner ét sted. Du kan nemt booke og administrere dine hold, tilmelde dig kommende events og følge dine personlige træningsprogrammer, så du holder kursen mod dine mål. Appen giver dig også adgang til en butik, hvor du kan købe udstyr, kosttilskud og andre nødvendigheder. Du kan registrere dine træningsresultater over tid og følge din udvikling. Derudover kan du lære holdet bag centret at kende i afsnittet "Mød teamet". Alle funktioner er designet med fokus på en professionel og brugervenlig oplevelse – skræddersyet til vores medlemmers behov.

About

Caffeine Tracker

This app helps you track your caffeine intake and understand its impact on your sleep. It provides personalized insights into your caffeine metabolism, allowing you to build better habits and brew coffee like a pro. Syncs with Apple Health for comprehensive sleep analysis.

Highlights
  • Log caffeine intake with custom drinks
  • Personalized metabolism curve and half-life
  • Caffeine level forecasts
  • Sleep rating and efficiency tracking
  • Brewing calculator and timer
  • Apple Health integration
  • Detox planner
Features
Read full description

Doppio is a native caffeine tracker that estimates how much caffeine is still in your system right now — and how it fades over the hours ahead. Log drinks with a tap, watch your levels decay on a personalized metabolism curve, and finally answer the question that matters: is that afternoon coffee going to keep you up tonight? Doppio is free for the core functions. Track your caffeine, see your metabolism curve, and brew better coffee without paying anything — ever. TRACK EVERY CUP • 21 built-in drinks plus custom entries • Adjust serving size from 10–100% • Edit, annotate, and delete past entries • Real-time caffeine level based on your personal half-life • Full history at any time range — today, this week, this month, or all time KNOW YOUR METABOLISM • A quick onboarding questionnaire estimates your caffeine sensitivity • Your personalized half-life powers every chart, widget, and forecast • Retake or reset the profile any time in Settings BUILD BETTER HABITS • Daily limit with notifications • Under-limit streaks with milestone celebrations • A morning suggestion that adapts to how you actually slept • Rate how you slept each night, and see efficiency, awakenings, and sleep stages when Health has the data BREW LIKE A PRO • Caffeine and ratio calculator for 10 brewing methods • Brew timer with a Lock Screen and Dynamic Island Live Activity • Start your favorite saved brew with Siri or a Shortcut AT A GLANCE • Home Screen widget with your caffeine level, also built for StandBy • One-tap logging from the widget and Control Center, or open straight to the drink picker • Log, check, and undo with Siri — or find your drinks and brews in Spotlight ACROSS YOUR DEVICES • iCloud keeps your caffeine log, coffee shelf, and saved brews in sync • Uses your own private iCloud — there is no Doppio account to create APPLE HEALTH • Two-way caffeine sync — write what you log, or import caffeine already in Health, your Apple Watch, or another app • Sleep read and headache-symptom logging • Every sync is opt-in and controlled by you ACCESSIBLE TO EVERYONE • VoiceOver throughout, with charts you can listen to and brew timers that speak • Clear text in every theme, plus Reduce Motion and larger text sizes • A simplified Assistive Access version of Doppio for people who want fewer choices DOPPIO PRO Everything above is free, forever. Doppio Pro adds: • Caffeine Insights — your full stats, a bedtime forecast with a "last coffee by" time, and a day-by-day breakdown of everything you've logged • Caffeine & Sleep Insights — see how your sleep score changes on high- and low-caffeine nights • Detox Planner — guided 7–30 day plans to cut back, with symptom tracking • Saved Brews — dial in a recipe once and start it in a single tap, from the app, a widget, or Siri • Coffee Shelf — keep your beans, roasters, and ratings in one place — with photos and storage tracking • Five extra app themes • Larger Home Screen widgets with your metabolism curve and detox progress Doppio Pro is available as a yearly subscription or a one-time lifetime purchase. No ads, ever. Available in English, German, Spanish, French, Italian, Dutch, Portuguese (Portugal and Brazil), Japanese, and Korean. Caffeine figures in Doppio are estimates. They come from a standard half-life model adjusted by the answers you give during setup — not from measuring your body. Doppio is not a medical device and does not provide medical advice; talk to a clinician about specific health concerns. Your data stays on your device and in your private iCloud unless you enable Apple Health sync. Analytics are optional and never include your caffeine logs, health samples, or notes.

Screenshots

Kraftvrk4 screens
Caffeine Tracker4 screens

Verdict

The call

The clearest difference is in-app purchases: Kraftvrk at none against Caffeine Tracker's 2. Kraftvrk also leads on iOS requirement (15.5 vs 26.1). On price, update cadence, ads 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 Tracker sells 2 in-app purchases, starting at $4.99 per year. Kraftvrk asks for nothing beyond the download.

UpkeepUpdate frequency

Kraftvrk ships an update every 11 days, Caffeine Tracker every 8 days. The most recent releases landed on October 3, 2026 and October 15, 2026 respectively.

Scorecard2 real differences · 8 level
Kraftvrk versus Caffeine Tracker: the parameters behind the verdict, then further details
ParameterKraftvrkCaffeine Tracker
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 11 daysEvery 8 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPod — betteriPhone
Requires iOS15.5 — better26.1
Further details — not scored
Size60 MB20 MB
Age rating4+4+
DeveloperBooking BoardMOBILE CODING FACTORY DOO

In-app purchases

None

Kraftvrk

No in-app purchases

2 purchases

Caffeine Tracker

Subscriptions1
  • Doppio Pro Yearly1 Year trial$4.991 Year
One-time1
  • Doppio Lifetime$12.99

Questions

Is Kraftvrk free?
Kraftvrk is free to download, with no in-app purchases.
Is Caffeine Tracker free?
Caffeine Tracker is free to download, with in-app purchases available.
Do Kraftvrk or Caffeine Tracker have ads?
Neither Kraftvrk nor Caffeine Tracker shows ads.
Which is updated more often, Kraftvrk or Caffeine Tracker?
Kraftvrk ships an update every 11 days, and Caffeine Tracker every 8 days. Most recently, Kraftvrk was updated on October 3, 2026 and Caffeine Tracker on October 15, 2026.

Other comparisons