Battery Phone Guard + Widget vs Sentry Saver
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Battery Phone Guard + Widget
Prevent battery degradation by setting custom charging alerts. This app notifies you when your device reaches a desired charge level, helping you avoid overcharging and extend battery lifespan. Features include Apple Watch integration and home screen widgets.
- Customizable charge threshold alerts
- Loud, unmissable alarms
- Apple Watch app and complication
- Home screen widgets
- Ad-free premium option
- Lifetime purchase option
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Your iPhone battery degrades every time you overcharge it. Battery Alarm fixes that. Set a threshold — 80% is the sweet spot — and get a loud, unmissable alarm the moment your battery hits it. Plug in, walk away, and trust Battery Alarm to tell you when to unplug. No more compulsively checking. No more degraded battery capacity after a year of overnight charging. What's new in version 3.0 * Battery Alarm has been completely rebuilt from the ground up. * Brand new design — dark, premium, and built around a clean amber and navy visual language. Every screen redesigned. * Apple Watch app — set and cancel your alarm directly from your wrist. Adjust your charge threshold using the Digital Crown. No need to reach for your phone. * Apple Watch complication — see your iPhone's battery percentage directly on your watch face. Your iPhone charge level, glanceable on your wrist at any time. This is not something Apple provides natively — Battery Alarm brings it to your watch face. * Home screen widgets — three sizes. See your target charge level and alarm status without opening the app. * Lifetime purchase — a one-time payment that unlocks everything, forever. No subscription required if you prefer to pay once. How it works * Set your charge threshold. Pick your alarm sound. Done. Battery Alarm runs quietly in the background and fires when it matters. Battery Alarm Premium unlocks: * Ad-free experience * Premium and system alert sounds * Custom sounds from your files * All current and future features Privacy Policy: https://bytehood.com/app-store-privacy-policy.html Terms and Conditions: https://bytehood.com/battery-alarm.html
Sentry Saver
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Sentry Mode keeps your Tesla's cameras watching while it sits parked. Left on around the clock, it is one of the largest silent drains there is — for a low-mileage driver it can use more energy in a day than actually driving does. This app shows you what that costs, and helps you cut it back without giving up protection when you need it. SEE THE COST, IN NUMBERS YOU FEEL Pick your car, drag one slider from 24 hours down to whatever suits you, and choose whether to see a day, a week or a month. The figures update as you drag: • The energy you would save • The range that energy is worth • What it saves at your own electricity price • How many extra days of driving it adds up to Everything is computed on your device from your own car and tariff settings. Every default is visible and editable — including the standby draw, which is labelled as the estimate it is rather than presented as a specification. LOOK AT WHAT SENTRY MODE HAS ACTUALLY RECORDED Guessing at a schedule is how people end up unprotected at the wrong moment. The events are the evidence, and you already have them. Tell the app when your recorded events happened — type the times in, or hand it screenshots of your clip list and let it read them. It lays them out hour by hour, so you can see for yourself which hours have ever produced an event and which never have, and decide from that whether the protection you are paying range for is doing anything at that time of night. It then marks the longest stretch in which nothing has ever been recorded — the hours where leaving Sentry Mode on is buying you the least. A window appears from the very first event, and always alongside how much evidence stands behind it. It can only narrow as you add more, never widen, so you can act on it early and refine later. Recognise something harmless? A parking attendant's nightly round, a neighbour coming home — remove it, and it stays removed. SET A REMINDER Choose when the cameras should switch off and when they should come back on. A notification arrives at each end of the window, so it becomes routine rather than something you meant to do. YOUR FOOTAGE NEVER LEAVES YOUR PHONE Timestamps are read on the device itself. Your images are never uploaded, never stored by us, and never seen by anyone but you. NO ACCOUNT, NO CLOUD, NO CONNECTION TO YOUR CAR There is no sign-up and no server. This app never contacts your vehicle or any vehicle service — it works entirely from what you tell it and what is already on your phone. WORKS ALONGSIDE SHORTCUTS The Tesla app offers a Sentry Mode action in Apple's Shortcuts. This app works out which hours are worth scheduling; you build that automation yourself, in Shortcuts. THE FINAL CALL IS YOURS The app can see what time events happened. Only you can see how overlooked your parking spot is, how well lit it is, or who else is keeping an eye on it. Treat every suggestion as a starting point. --- An independent tool for owners, published by AInfo. Not affiliated with, endorsed by, or sponsored by Tesla, Inc. Tesla and Sentry Mode are trademarks of Tesla, Inc., used here only to describe what this app works with. This app does not connect to, control, or communicate with any vehicle.
Screenshots
Verdict
The clearest difference is in-app purchases: Sentry Saver at none against Battery Phone Guard + Widget's 3. Battery Phone Guard + Widget's advantage is ads (none vs shown) and update cadence (weekly vs every 3 weeks). On price and iOS requirement 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. Battery Phone Guard + Widget sells 3 in-app purchases, starting at $2.99 per month. Sentry Saver asks for nothing beyond the download.
Battery Phone Guard + Widget ships an update weekly, Sentry Saver every 3 weeks. The most recent releases landed on November 12, 2026 and November 6, 2026 respectively.
| Parameter | Battery Phone Guard + Widget | Sentry Saver |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (41 ratings) — better | — |
| Positive reviews | 57.1% of reviews | — |
| Number of ratings | 41 — better | — |
| Update frequency | Weekly — better | Every 3 weeks |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 22 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Bytehood | Yuan-Yi Chang |
In-app purchases
Battery Phone Guard + Widget
- Premium Monthly$2.991 Month
- Premium Yearly7 Days trial$6.991 Year
- Premium Lifetime$9.99
Sentry Saver
No in-app purchases
Questions
Is Battery Phone Guard + Widget free?
Is Sentry Saver free?
Do Battery Phone Guard + Widget or Sentry Saver have ads?
Which is updated more often, Battery Phone Guard + Widget or Sentry Saver?
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