# Cafactor vs Caffeine Clock

The clearest difference is update cadence: Caffeine Clock at every 2 days against Cafactor's weekly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Cafactor sells 1 one-off in-app purchase and Caffeine Clock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Cafactor ships an update weekly, Caffeine Clock every 2 days. The most recent releases landed on September 9, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Cafactor | Caffeine Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cafactor/id6757445668/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Monetization | Freemium | — |
| Size | 9 MB | 6 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [Nan Yu](https://appshunter.io/developer/1559044036) | [kazunari aoki](https://appshunter.io/developer/6774180811) |

## What reviewers say

### Cafactor

[App page](https://appshunter.io/ios/app/cafactor/id6757445668)

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:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cafactor Pro | $3.99 | one-time |


### Caffeine Clock

[App page](https://appshunter.io/ios/app/caffeine-clock-bedtime/id6796871272)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caffeine Clock Pro | $9.99 | one-time |


## Frequently asked questions

### Is Cafactor free?

Cafactor is free to download, with in-app purchases available.

### Is Caffeine Clock free?

Caffeine Clock is free to download, with in-app purchases available.

### Do Cafactor or Caffeine Clock have ads?

Neither Cafactor nor Caffeine Clock shows ads.

### Which is updated more often, Cafactor or Caffeine Clock?

Cafactor ships an update weekly, and Caffeine Clock every 2 days. Most recently, Cafactor was updated on September 9, 2026 and Caffeine Clock on September 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*