Comparison

Cafactor vs ZenSee

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

Head to head
About

Cafactor

This app models your body's real-time caffeine levels using a scientific pharmacokinetic approach. It helps you understand your caffeine absorption, decay, and personal sleep thresholds, adapting to your unique biology and activity. Connect with health data for an even smarter metabolic coaching experience.

Highlights
  • Real-time caffeine curve modeling
  • Personalized physiological parameters
  • HealthKit integration for adaptive coaching
  • Exercise and sleep-adaptive thresholds
  • HRV & Recovery integration
  • Progressive calibration of half-life
  • Offline, private tracking
Features
Read full description

Caffeine Hourglass is now Cafactor — rebuilt from the ground up. What began as a simple caffeine timer has evolved into a full physiological model that adapts to your biology in real time. Version 2.0 isn't an update. It's a new category of health tool. Know your caffeine. Protect your sleep. Log a drink in seconds. Cafactor computes your real-time caffeine curve using a peer-reviewed pharmacokinetic model — complete with a realistic absorption phase, first-order decay, and your personal biological parameters. See whether you can safely have one more coffee, and exactly when your levels will drop below your personal sleep threshold. Personalised to your body Set your sex, height, weight, and age. Cafactor applies the Boer (1984) lean-body-mass formula to calculate how caffeine distributes in your specific body. Add smoking status, hormonal medication, or pregnancy for a half-life that's truly yours. Your tolerance to caffeine — derived automatically from 7-day history — rounds out the picture. HealthKit: exponentially smarter Connect Apple Health and Cafactor transforms from a tracker into an adaptive metabolic coach: • Exercise modifier — Recent vigorous workouts temporarily speed up your metabolism. Cafactor detects this from HealthKit and adjusts your decay curve automatically. • Sleep-adaptive threshold — Last night's poor sleep tightens your safe window today. Great sleep? More room for your morning ritual. • HRV & Recovery (Apple Watch) — Daily heart-rate variability fuses with sleep quality to create a PhysiologicalState score, shifting your optimal intake windows and adjusting thresholds by up to 40%. • Progressive calibration — Recency-weighted regression over 30 days of sleep and HRV feedback automatically refines your personal half-life, growing from Preliminary to Reliable confidence as data accumulates. Pro features Unlimited history · Trend, sleep quality and scatter charts · Last safe caffeine time · Four smart notifications (morning window, safe window, withdrawal, recovery) · Shareable weekly report · Siri shortcuts · Unlimited custom drinks Free, forever, offline Core tracking is always free. No account. No internet. No data leaves your device — ever.

About

ZenSee

Features
Read full description

In today's fast-paced world, finding inner peace is precious. This app is designed for anyone focused on mental wellness, meditation, and Zen practice. Whether you're a mindfulness beginner or an experienced practitioner, you'll find the perfect tools and companionship here. [Key Features] • Meditation Timer: An intuitive, dedicated timer featuring soothing singing bowl sounds to help you achieve deep focus and relaxation. • Practice Tracking: Log your meditation sessions and insights. Witness your personal growth on the path of mindfulness. • Versatile Modes: Tailored for various scenarios including mindful breathing, deep meditation, and sleep relaxation to meet your needs at different stages. • Focused Zen Space: A minimalist, distraction-free interface that creates an immersive digital sanctuary for your mind. [Who is this for] • Anyone looking to relieve anxiety and stress through meditation. • Students and professionals aiming to improve focus and sleep quality. • Spiritual seekers diving deep into Zen, mindfulness, and self-awareness. Download now. Take a few minutes each day to connect with yourself, discover clarity through meditation, and embrace the peace and joy of your spiritual practice.

Screenshots

Cafactor4 screens
ZenSee4 screens

Verdict

The call

The clearest difference is in-app purchases: ZenSee at none against Cafactor's 1. Cafactor's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement 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. Cafactor sells 1 one-off in-app purchase. ZenSee asks for nothing beyond the download.

UpkeepUpdate frequency

Cafactor ships an update weekly, ZenSee every 9 days. The most recent releases landed on September 25, 2026 and October 8, 2026 respectively.

Scorecard2 real differences · 8 level
Cafactor versus ZenSee: the parameters behind the verdict, then further details
ParameterCafactorZenSee
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyWeekly — betterEvery 9 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS17.617.0 — better
Further details — not scored
Size9 MB27 MB
Age rating4+4+
DeveloperNan Yu宇 占

In-app purchases

1 purchases

Cafactor

One-time1
  • Cafactor Pro$3.99
None

ZenSee

No in-app purchases

Questions

Is Cafactor free?
Cafactor is free to download, with in-app purchases available.
Is ZenSee free?
ZenSee is free to download, with no in-app purchases.
Do Cafactor or ZenSee have ads?
Neither Cafactor nor ZenSee shows ads.
Which is updated more often, Cafactor or ZenSee?
Cafactor ships an update weekly, and ZenSee every 9 days. Most recently, Cafactor was updated on September 25, 2026 and ZenSee on October 8, 2026.

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