Comparison

cycle.log vs KernelHairs

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

Head to head
About

cycle.log

This app simplifies tracking your menstrual cycles and predicting your next period. It learns from your logged cycles to provide increasingly accurate estimates and reminders. The more you use it, the smarter its predictions become.

Highlights
  • Simple cycle logging
  • Next period prediction
  • Automated cycle length adjustment
  • Cycle length standard deviation calculation
  • Period reminders
Features
Read full description

cycle.log is not "yet another period tracker." Unlike other menstrual cycle trackers, cycle.log makes is extremely simple to log your cycles and see when your next period is going to start. Not only is it easy to log your cycles, but cycle.log will also send you a friendly reminder before your next period so you can be prepared. The more you use cycle.log the smarter it becomes. Every time you log a cycle the app automatically adjusts your average cycle length and uses that to estimate your next period. It also calculates the standard deviation of your cycle length which tells you how different your cycles are from one another. Please give cycle.log a try and be sure to tell your friends!

About

KernelHairs

Features
Read full description

It is a software for controlling the hair loss therapy device, a tool for providing the scientific therapeutic regimen, recording treatment time & effect. It is a multi-user communication platform for treatment effect & experience. The user can use APP to connect the device through Bluetooth for hair loss therapy and online choosing therapeutic regimen (set up treatment time, treatment region, etc.) [disclaimer] 1. Users should consult the doctor before making a decision using the information provided by the [Kono black hair generator] client. In case of wrong understanding of the information content and wrong judgment of their own situation, the user shall bear the consequences. The client is not responsible for any deviation of this data. 2. The user agrees to bear all risks for all consequences arising from the network service of [Kono heirshengfa instrument], and does not make any kind of guarantee or assume any responsibility for the user. [Kono heirshengfa instrument] does not guarantee that the network service will meet the requirements of users, nor does it guarantee that the network service will not be interrupted, nor does it guarantee the timeliness, security and accuracy of the service. For network service interruption or other defects caused by force majeure or unavoidable or uncontrollable reasons, [Kono heirshengfa instrument] will not bear any responsibility, but will try its best to reduce the loss and impact on users. 3. The user agrees to protect and protect the interests of [Kono heirshengfa instrument] and other users. In case of losses caused to [Kono heirshengfa instrument] or any other third party due to the user's violation of relevant laws, regulations or any terms of the terms of service, the user agrees to bear the liability for damages caused thereby. [Kono heirshengfa instrument] shall not be liable for any direct, indirect, accidental and special damages caused by the user's use of the service. These damages may but are not limited to: improper use of network services, illegal use of network services or changes in the information transmitted by the user.

Screenshots

cycle.log3 screens
KernelHairs4 screens

Verdict

The call

The clearest difference is in-app purchases: KernelHairs at none against cycle.log's 3. On price, update cadence, ads and device support 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. cycle.log sells 3 one-off in-app purchases. KernelHairs asks for nothing beyond the download.

UpkeepUpdate frequency

cycle.log ships an update every 2 months, KernelHairs every 3 months. The most recent releases landed on September 30, 2026 and September 25, 2026 respectively.

Scorecard1 real difference · 9 level
cycle.log versus KernelHairs: the parameters behind the verdict, then further details
Parametercycle.logKernelHairs
PriceFreeFree
Rating4.5 (25 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings25 — better—
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size23 MB44 MB
Age rating12+12+
Developer433 Labs徐州科诺医疗仪器设备有限公司

In-app purchases

3 purchases

cycle.log

One-time3
  • Small Tip$0.99
  • Medium Tip$2.99
  • Large Tip$4.99
None

KernelHairs

No in-app purchases

Questions

Is cycle.log free?
cycle.log is free to download, with in-app purchases available.
Is KernelHairs free?
KernelHairs is free to download, with no in-app purchases.
Do cycle.log or KernelHairs have ads?
Neither cycle.log nor KernelHairs shows ads.
Which is updated more often, cycle.log or KernelHairs?
cycle.log ships an update every 2 months, and KernelHairs every 3 months. Most recently, cycle.log was updated on September 30, 2026 and KernelHairs on September 25, 2026.

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