cycle.log vs KernelHairs
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Simple cycle logging
- Next period prediction
- Automated cycle length adjustment
- Cycle length standard deviation calculation
- Period reminders
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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!
KernelHairs
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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
Verdict
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
Both are free to download. cycle.log sells 3 one-off in-app purchases. KernelHairs asks for nothing beyond the download.
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.
| Parameter | cycle.log | KernelHairs |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (25 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 25 — better | — |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 23 MB | 44 MB |
| Age rating | 12+ | 12+ |
| Developer | 433 Labs | 徐州科诺医疗仪器设备有限公司 |
In-app purchases
cycle.log
- Small Tip$0.99
- Medium Tip$2.99
- Large Tip$4.99
KernelHairs
No in-app purchases






