Battery Nudge vs Sentry Saver
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Battery Nudge
This utility app provides customizable alerts to remind you to charge your device before the battery runs out. Choose your preferred notification level, sound style, and quiet hours for a personalized charging reminder experience.
- Customizable battery level threshold
- Multiple reminder styles (Calm, Firm, Emergency)
- Repeat reminders
- Quiet hours for uninterrupted sleep
- Light and dark themes
- Offline functionality, no internet required
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Never get caught on empty again. Battery Nudge is a beautifully simple reminder that tells you to plug in before your phone dies — not after. Choose the battery level that matters to you, pick how loud the reminder should be, and let Battery Nudge quietly watch your back. WHY BATTERY NUDGE • Set your own threshold — Get nudged at 20%, 30%, 50%, or any level you choose. • Three reminder styles — Calm for a gentle heads-up, Firm for a direct prompt, or Emergency for an alert that's impossible to ignore. • Repeat reminders — Keep getting nudged every 10 minutes until you actually plug in. • Quiet hours — Mute reminders while you sleep so you're never woken up. • Light & Dark themes — A clean, minimal design that looks great day or night. PRIVATE BY DESIGN Battery Nudge runs entirely on your device. No account, no sign-up, no tracking, and no internet connection required. Your settings stay on your phone — that's it. SIMPLE AND FOCUSED No clutter. No ads interrupting you. Just one job done well: making sure a dead battery never catches you by surprise. Set it once and forget the anxiety.
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 ads: Battery Nudge at none against Sentry Saver's shown. Sentry Saver's advantage is update cadence (every 10 days vs every 4 weeks). On price, in-app purchases, device support 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. Neither carries in-app purchases, so what you see is what you pay.
Battery Nudge ships an update every 4 weeks, Sentry Saver every 10 days. The most recent releases landed on October 14, 2026 and October 28, 2026 respectively.
| Parameter | Battery Nudge | Sentry Saver |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 4 weeks | Every 10 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 18 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Kymata Labs LLC | Yuan-Yi Chang |
In-app purchases
Battery Nudge
No in-app purchases
Sentry Saver
No in-app purchases
Questions
Is Battery Nudge free?
Is Sentry Saver free?
Do Battery Nudge or Sentry Saver have ads?
Which is updated more often, Battery Nudge or Sentry Saver?
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