# Cafactor vs ZenSee

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.

Both are free to download. Cafactor sells 1 one-off in-app purchase. ZenSee asks for nothing beyond the download.

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

## The numbers

| Metric | Cafactor | ZenSee |
| --- | --- | --- |
| 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 | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 9 days |
| Monetization | Freemium | — |
| Size | 9 MB | 27 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nan Yu](https://appshunter.io/developer/1559044036) | [宇 占](https://appshunter.io/developer/1885849644) |

## 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 |


### ZenSee

[App page](https://appshunter.io/ios/app/zensee/id6760809128)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


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