# Sleep Cycle Tracker vs CarcinogenX

The clearest difference is update cadence: Sleep Cycle Tracker at monthly against CarcinogenX's every 2 months. On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Sleep Cycle Tracker sells 3 in-app purchases, starting at $1.99 per month and CarcinogenX sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Sleep Cycle Tracker against 5.0 for CarcinogenX. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Sleep Cycle Tracker ships an update monthly, CarcinogenX every 2 months. The most recent releases landed on November 5, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Sleep Cycle Tracker | CarcinogenX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/sleep-cycle-tracker-harmoni/id6498994045/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/carcinogenx/id6736572943/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Freemium | Freemium |
| Size | 14 MB | 7 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ready Apps LLC (WA)](https://appshunter.io/developer/1703345490) | [Kornerstone Industries](https://appshunter.io/developer/1879891786) |

## What reviewers say

### Sleep Cycle Tracker

[App page](https://appshunter.io/ios/app/sleep-cycle-tracker-harmoni/id6498994045)

Unwind with sleep sounds, bedtime stories, and wind-down routines. Log your sleep, explore insights from Apple Health, and monitor nighttime sounds. Offers free and premium content for a personalized sleep experience.

**Highlights:** Sleep sounds and white noise, Bedtime stories and routines, Sleep journaling and mood logging, Apple Health sleep insights, Nighttime sound monitoring, Offline generated noise

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.99 | per month |
| Yearly Subscription | $9.99 | per year |
| Lifetime subscription | $19.99 | one-time |


### CarcinogenX

[App page](https://appshunter.io/ios/app/carcinogenx/id6736572943)

Identify harmful carcinogens in everyday products to make safer choices. This tool empowers users with knowledge for healthier living, offering an innovative and user-friendly experience. Always consult a doctor for medical decisions.

**Highlights:** Carcinogen identification, Product safety analysis, Healthier living guidance, User-friendly interface, Informed purchasing decisions

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $3.99 | per month |
| Yearly | $35.99 | per year |
| Lifetime | $69.99 | one-time |


## Frequently asked questions

### Is Sleep Cycle Tracker free?

Sleep Cycle Tracker is free to download, with in-app purchases available.

### Is CarcinogenX free?

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

### Which has better reviews, Sleep Cycle Tracker or CarcinogenX?

Sleep Cycle Tracker and CarcinogenX are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do Sleep Cycle Tracker or CarcinogenX have ads?

Neither Sleep Cycle Tracker nor CarcinogenX shows ads.

### Which is updated more often, Sleep Cycle Tracker or CarcinogenX?

Sleep Cycle Tracker ships an update monthly, and CarcinogenX every 2 months. Most recently, Sleep Cycle Tracker was updated on November 5, 2026 and CarcinogenX on November 4, 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.*