# Sleepi.ai vs Cafactor

The clearest difference is in-app purchases: Sleepi.ai 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. Sleepi.ai asks for nothing beyond the download.

Sleepi.ai ships an update every 9 days, Cafactor weekly. The most recent releases landed on October 2, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Sleepi.ai | Cafactor |
| --- | --- | --- |
| 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 | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | — | Freemium |
| Size | 14 MB | 9 MB |
| Requires iOS | **16.4** | 17.6 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Shenzhen Infinite State Technology Co., Ltd](https://appshunter.io/developer/1809522415) | [Nan Yu](https://appshunter.io/developer/1559044036) |

## What reviewers say

### Sleepi.ai

[App page](https://appshunter.io/ios/app/sleepiai/id6738334367)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Sleepi.ai free?

Sleepi.ai is free to download, with no in-app purchases.

### Is Cafactor free?

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

### Do Sleepi.ai or Cafactor have ads?

Neither Sleepi.ai nor Cafactor shows ads.

### Which is updated more often, Sleepi.ai or Cafactor?

Sleepi.ai ships an update every 9 days, and Cafactor weekly. Most recently, Sleepi.ai was updated on October 2, 2026 and Cafactor on September 25, 2026.

---

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