Comparison

Sleep Cycle Tracker vs CarcinogenX

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

Head to head
About

Sleep Cycle Tracker

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
Read full description

Unwind with sleep sounds and bedtime stories. Build a wind-down routine, log your night, and explore available sleep insights from Apple Health with Harmoni. SOUNDS FOR YOUR EVENING Explore nature sounds and white, pink and brown noise. Layer sounds, adjust volumes, save favorites and set a sleep timer. Generated noise works offline; other audio needs a connection or a previously cached file. STORIES AND WIND-DOWN ROUTINES Choose a track from illustrated story and soundscape collections. Set your sleep goal and schedule, then follow bedtime activities at your own pace, with optional reminders. YOUR SLEEP JOURNAL Log bedtime, wake time, sleep quality, wake-ups and morning mood. Add a reflection and revisit your entries. Manual check-ins receive an estimated score based on your answers; they do not measure sleep stages. OPTIONAL APPLE HEALTH INSIGHTS See available sleep records, calculated scores and stage details. Stages require compatible data in Apple Health, such as recordings from an Apple Watch. Missing measurements are shown as unavailable. NIGHTTIME SOUND SUMMARIES With microphone permission, monitor sound levels and review detected sound disturbances. Only summaries are saved, not audio recordings. This feature does not identify snoring or diagnose sleep conditions. Start without entering a password using an automatic account. Optional sign-in helps you keep your account across devices. Free and premium content is available. Some sounds and collections require Harmoni Premium; purchase options and current prices are shown in the app. The app interface is currently in English. Stories are not available in every language. Harmoni is a wellness app, not a medical device. Scores are estimates, not diagnoses or treatments. Privacy Policy: https://www.relaxingharmony.app/privacy Terms of Use: https://www.relaxingharmony.app/terms Support: https://www.relaxingharmony.app/contact

About

CarcinogenX

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
Read full description

Discover healthier living with CarcinogenX, your essential tool for identifying harmful carcinogens in everyday products. Designed to empower users with knowledge, this app combines innovative features and a user-friendly experience to help you make safer choices for yourself and your loved ones. Disclaimer: Seek a doctor’s advice in addition to using CarcinogenX and before making any medical decisions. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Sleep Cycle Tracker4 screens
CarcinogenX4 screens

Verdict

The call

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.

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. 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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard1 real difference · 9 level
Sleep Cycle Tracker versus CarcinogenX: the parameters behind the verdict, then further details
ParameterSleep Cycle TrackerCarcinogenX
PriceFreeFree
Rating5.0 (1 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews—
Number of ratings12 — better
Update frequencyMonthly — betterEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.016.0 — better
Further details — not scored
Size14 MB7 MB
Age rating4+4+
DeveloperReady Apps LLC (WA)Kornerstone Industries

Customer experience

Sleep Cycle Tracker

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

CarcinogenX

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Sleep Cycle Tracker

Subscriptions2
  • Monthly Subscription$1.991 Month
  • Yearly Subscription7 Days trial$9.991 Year
One-time1
  • Lifetime subscription$19.99
3 purchases

CarcinogenX

Subscriptions2
  • Monthly Subscription$3.991 Month
  • Yearly$35.991 Year
One-time1
  • Lifetime$69.99

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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