Aray Power vs ChangeDay
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Aray Power
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Aolei Energy Software provides real-time monitoring services for users' residential PV energy storage and commercial & industrial (C&I) energy storage equipment systems. The software needs to be paired with an energy storage management system, including hardware such as solar photovoltaic panels, inverters, and energy storage batteries. It is convenient for users to view real-time data on power storage, power generation, power consumption, equipment operation, as well as equipment status.
ChangeDay
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ChangeDay helps people with Type 1 Diabetes and their caregivers remember when insulin infusion sites, CGMs, and pump batteries were last changed, and when they are due next. Built for simple shared routines, ChangeDay keeps the focus on the three things you need to check quickly: your site, your sensor, and your pump battery. Log a change in one tap, see the next due day, and optionally share the same tracker with a caregiver or family member using Appleβs CloudKit Sharing. Whether you are tracking your own routine or helping someone else stay organized, ChangeDay is designed to be calm, private, and easy to use. Key features: β’ Track insulin infusion site changes β’ Track glucose sensor change days β’ Track insulin pump battery changes β’ See last changed and next due dates at a glance β’ Log site, sensor, or pump battery changes in one tap β’ View upcoming change days on a simple calendar β’ Review change history β’ Set local reminders for due dates β’ Share one tracker with another person using iCloud/CloudKit Sharing β’ Keep data stored locally and in your personal iCloud account β’ No account, ads, or subscription ChangeDay is intentionally simple. It is not a blood glucose tracker, dosing calculator, medication manager, or diabetes treatment app. It does not provide medical advice, dosing guidance, diagnosis, treatment recommendations, or emergency alerts. Always follow guidance from your clinician and the instructions from your device manufacturer.
Screenshots
Verdict
The clearest difference is iOS requirement: Aray Power at 15.6 against ChangeDay's 17.6. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Aray Power | ChangeDay |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | β |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod β better | iPhone |
| Requires iOS | 15.6 β better | 17.6 |
| Further details β not scored | ||
| Size | 34 MB | 5 MB |
| Age rating | 12+ | 4+ |
| Developer | ζ·±ε³εΈε²ι·ζ°θ½ζΊη§ζζιε ¬εΈ | jonathan hering |
In-app purchases
Aray Power
No in-app purchases
ChangeDay
No in-app purchases









