ChangeDay vs Battery Inventory
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
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.
Battery Inventory
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Every battery in your home and workshop, handled. Know what each device takes, keep spares in the drawer, and get a reminder before anything dies. For power tools, see which packs are charged and ready for the job. FOR YOUR HOME β’ Add the TV remote, smoke alarm, AirTag, car key, scale or thermostat in a tap. 36 common devices come with the right battery already filled in. β’ See exactly what each one takes: CR2032, CR2016, AA, AAA, 9V, LR44, hearing aid sizes and more. β’ Battery finder: search 357 and get LR44, search DL2032 and get CR2032. Or point your camera at the code on a coin cell. β’ Group devices by room: hallway, kitchen, garage. REMINDERS THAT MAKE SENSE β’ Smoke and CO alarms get a monthly test reminder and a clear change date. β’ Devices that fail quietly, like sensors and car keys, get a gentle "worth a check" with simple how-to-check steps. β’ Things that tell you themselves, like AirTags, don't nag you. β’ Log a change in one tap. The app learns how long batteries really last in each device. SPARES & SHOPPING LIST β’ A drawer for your spare batteries: swipe a card to add one or use one. β’ Set a minimum for each size. The shopping list fills itself in as devices come due, ready to share. WORKSHOP: POWER-TOOL PACKS β’ Track every cordless pack, charger and tool: charged, charging, in a tool, lent out or missing. β’ Plan a job and see which packs to charge, when, and on which charger. β’ Live charging progress and time to full. β’ Pack care: a nudge when a pack has been left full or empty too long, with the storage charge that keeps it healthy. β’ QR labels and NFC stickers: scan to open any pack. β’ Works with DeWalt, Makita, Milwaukee, Bosch, Ryobi, Einhell, Parkside, Hilti, Stihl, EGO and more. ALWAYS AT HAND β’ Home Screen widgets show what's due next. β’ Ask Siri which battery the TV remote takes, what's due, or log a change hands-free. β’ Made for iPhone and iPad. PRIVATE BY DESIGN No account and no ads. Your data stays on your device, or in your own iCloud with Pro. FREE Up to 10 household devices, every reminder, smoke and CO alarm test reminders, spares, the shopping list, small and medium widgets, and a starter Workshop (3 packs, 1 charger, 2 tools). BATTERY INVENTORY PRO β’ Unlimited devices β’ The full Workshop: every pack, charger and tool, job planning and charge-done alerts β’ iCloud sync between iPhone and iPad β’ Large and Lock Screen widgets β’ CSV and PDF export, handy for insurance One purchase covers your family with Family Sharing. Pro is available as a monthly or yearly subscription, or as a one-time lifetime purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel them anytime in your App Store account settings. A note on alarms: Battery Inventory sends reminders only. It can't see or test your alarms and doesn't replace the checks your alarm's maker recommends. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: ChangeDay at none against Battery Inventory's 2. On price, ads, device support and iOS requirement 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. Battery Inventory sells 2 in-app purchases, starting at $9.99 per year. ChangeDay asks for nothing beyond the download.
| Parameter | ChangeDay | Battery Inventory |
|---|---|---|
| Price | Free | Free |
| Update frequency | β | Every 2 months |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Devices | iPhone | iPhone, iPad β better |
| Requires iOS | 17.6 | 17.0 β better |
| Further details β not scored | ||
| Size | 5 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | jonathan hering | Tamas Bereczki |
In-app purchases
ChangeDay
No in-app purchases
Battery Inventory
- Battery Inventory Pro Yearly$9.991 Year
- Battery Inventory Pro (Lifetime)$24.99
Questions
Is ChangeDay free?
Is Battery Inventory free?
Do ChangeDay or Battery Inventory have ads?
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