Comparison

Battery HD+ vs Sentry Saver

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Battery HD+

This app provides a detailed battery monitoring experience for your phone or tablet. It offers calibration features for increased accuracy and displays estimated usage times for various activities, from listening to music to GPS navigation. It also includes charge alerts and a widget for quick access to information.

Highlights
  • Battery calibration
  • Usage time estimates
  • Charge alerts
  • Widget support
  • Detailed usage charts
Features
Read full description

This is the perfect battery monitor for your phone or tablet. It is simple, beautiful and can be calibrated specially for your device. - Widget - Charge Alerts - Usage chart Instantly know how many hours you have left for: - Listening to music - Watching video - Talking on the phone - Internet Browsing ( WiFi / Edge / 3G / 4G ) - Standby - Time left to recharge - Time to use LED Flashlight - 2D and 3D Games - Reading books - GPS navigation - Video chat - Taking photos - Recording videos If you have a new or rare device, please run calibration tests to share your results with the community and make this app even more precise ! Try it now ! It's simply the best at what it does.

About

Sentry Saver

Features
Read full description

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

Battery HD+4 screens
Sentry Saver3 screens

Verdict

The call

The clearest difference is update cadence: Sentry Saver at every 10 days against Battery HD+'s every 2 months. Battery HD+'s advantage is device support (4 vs 2). On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Battery HD+ ships an update every 2 months, Sentry Saver every 10 days. The most recent releases landed on October 15, 2026 and October 5, 2026 respectively.

Scorecard2 real differences · 8 level
Battery HD+ versus Sentry Saver: the parameters behind the verdict, then further details
ParameterBattery HD+Sentry Saver
PriceFreeFree
Rating4.5 (2.7K ratings) — better—
Positive reviews74.4% of reviews—
Number of ratings2.7K — better—
Update frequencyEvery 2 monthsEvery 10 days — better
AdsYesYes
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad
Requires iOS15.6 — better16.0
Further details — not scored
Size62 MB33 MB
Age rating4+4+
Developersmalltech sarlYuan-Yi Chang

Bugs and requests

Battery HD+

Reported bugs

3 issues
  • Calibration never completes
  • Battery level not detected
  • Incorrect battery percentage displayed

Requested features

4 requests
  • Battery health monitoring
  • Battery usage by app breakdown
  • Improved charging notifications
  • Apple Watch support

Sentry Saver

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Battery HD+

No in-app purchases

None

Sentry Saver

No in-app purchases

Questions

Is Battery HD+ free?
Battery HD+ is free to download, with no in-app purchases.
Is Sentry Saver free?
Sentry Saver is free to download, with no in-app purchases.
Do Battery HD+ or Sentry Saver have ads?
Both Battery HD+ and Sentry Saver show ads.
Which is updated more often, Battery HD+ or Sentry Saver?
Battery HD+ ships an update every 2 months, and Sentry Saver every 10 days. Most recently, Battery HD+ was updated on October 15, 2026 and Sentry Saver on October 5, 2026.

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