30 Day Back Ext. Challenge! vs Kenshin Note
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
30 Day Back Ext. Challenge!
This app helps you track your daily back extensions for a 30-day challenge. It allows you to count your exercises, manage your progress, and receive notifications. You can also record active energy and workouts to Apple Health.
- Count back extensions daily
- Manage achievement days
- Receive notifications
- Record active energy
- Sync with Apple Health
- Track workouts
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Supports Back Extension for 30 day challenge. Main function is to count Back Extension once a day. Main Function ・Count Back Extension. ・Achievement days management. ・Notifications. ・Record Active Energy and Workouts to Apple Health. How to use ・Put iPhone on floor. ・Tap screen. ・Keep your face close to iPhone screen. (Upper part) * ・Or count on iPhone screen tap. Active Energy ・Ex. METs 3.5, Weight 50 kg, Time 10 min. (3.5 - 1) x 50 x (10 / 60) x 1.05 = 21.86 kcal. Optional permission requests ・Apple Health: It is used to record data in Apple Health. ・Tracking: It is used to deliver personalized ads to you. ・Notifications: It is used to sending notifications. Languages ・Japanese, English. *Dynamic Island devices not supported
Kenshin Note
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Kenshin Note : Your Health Check Companion Kenshin Note helps you record, visualize, and understand your annual health checkup results - privately and beautifully. Key Features Effortless data entry : Add your blood pressure, BMI, and lab results in seconds with a clean, keyboard-friendly interface. Trends at a glance : Beautiful interactive charts help you spot health changes over time - like blood sugar, cholesterol, and more. Privacy-first by design : All data stays securely on your iPhone. No external servers or analytics. Optional iCloud sync : Keep your health data backed up and accessible across your Apple devices. Bilingual support : Available in English and Japanese - switches automatically based on your system language. Learn more at kenshinnote.com Disclaimer: Kenshin Note is for informational purposes only and does not provide medical diagnosis or treatment advice. Always consult a qualified healthcare professional before making medical decisions.
Screenshots
Verdict
The clearest difference is ads: Kenshin Note at none against 30 Day Back Ext. Challenge!'s shown. Kenshin Note also leads on update cadence (every 9 days vs every 3 months). 30 Day Back Ext. Challenge!'s advantage is iOS requirement (16.6 vs 26.0). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
30 Day Back Ext. Challenge! ships an update every 3 months, Kenshin Note every 9 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | 30 Day Back Ext. Challenge! | Kenshin Note |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (6 ratings) — better | — |
| Positive reviews | 46.2% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 3 months | Every 9 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 21 MB | 8 MB |
| Age rating | 17+ | 4+ |
| Developer | Intersect | Shubham Shetkar |
In-app purchases
30 Day Back Ext. Challenge!
No in-app purchases
Kenshin Note
No in-app purchases
Questions
Is 30 Day Back Ext. Challenge! free?
Is Kenshin Note free?
Do 30 Day Back Ext. Challenge! or Kenshin Note have ads?
Which is updated more often, 30 Day Back Ext. Challenge! or Kenshin Note?
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