BatteryPhone vs How Long Left
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BatteryPhone
Monitor your phone and watch battery levels directly from your wrist. Receive timely notifications for low or full charge status, and view historical battery data with convenient graph displays. Supports automatic updates via complications for seamless monitoring.
- Check phone and watch battery status
- Receive low and full charge notifications
- View battery level graphs
- Complication support for automatic updates
- Tap complication to manually update status
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You can check the battery status of your phone and watch with your watch. Compatible with complications (automatic update). You can check the charging amount and charging status of the phone in a timely manner from the clock face. We will notify you by a notification when the charge amount of the phone or watch becomes less than the specified% or becomes full charge. The graph also displays the change in charge level for your phone and watch. - Set up complications with the watch app on your watch or phone. - The battery status displayed in the complication is automatically updated approximately every 12 to 60 minutes. The reason why the update interval has a range is that it depends on Watch OS. If the automatic update has stopped (for example, there is no update for more than 1.5 hour), tap the complication to restart it. In the iPhone app, the latest update time is displayed under the watch's charge status display. - Tap the complication to update to the latest status. - A circular complication can be assigned to the outer circle and the inner number to indicate the battery level of the phone and watch, respectively. -- I am a Japanese developer. The support site can be translated into various languages with the "Translate" option on the right side of the site.
How Long Left
This app helps you visualize the time remaining for your calendar events. It offers a Today Widget, Siri integration, and an Apple Watch app for convenient access. Receive notifications for upcoming events and customize your watch face with countdown complications.
- Countdown calendar events
- Today Widget integration
- Siri integration
- Apple Watch app
- Time remaining notifications
- Apple Watch complications
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How Long Left is a simple app that helps you manage your time by displaying the time remaining of current calendar events. It also includes a Today Widget, Siri integration, and an Apple Watch app, time remaining notifications, and more. There is also an Apple Watch complication that, with an in-app purchase, can display a countdown for current and upcoming events.
Screenshots
Verdict
The clearest difference is in-app purchases: BatteryPhone at none against How Long Left's 4. BatteryPhone also leads on update cadence (every 2 months vs every 4 months) and ratings volume (156 vs 40). How Long Left's advantage is ads (none vs shown) and iOS requirement (12.0 vs 15.0). On price, rating, review sentiment and device support 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. How Long Left sells 4 one-off in-app purchases. BatteryPhone asks for nothing beyond the download.
How Long Left holds the better App Store score, 3.8 against 3.6. Both are backed by a comparable volume of ratings — 156 and 40 respectively. Written reviews point the same way: 54% of BatteryPhone's written reviews are positive against 59% of How Long Left's.
BatteryPhone ships an update every 2 months, How Long Left every 4 months. Both last shipped on November 2, 2026.
| Parameter | BatteryPhone | How Long Left |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (156 ratings) | 3.8 (40 ratings) — better |
| Positive reviews | 53.7% of reviews | 58.5% of reviews — better |
| Number of ratings | 156 — better | 40 |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Keietsu Yasuhara | Ryan Kontos |
Customer experience
BatteryPhone
How Long Left
User reviews
BatteryPhone
From 156 App Store ratingsWhat we love
- 👍 Easy to use
- 🚀 Convenient way to check battery levels
- 💡 Helpful complication options
- 🔋 Minimal battery drain
Room to improve
- 🐛 Inconsistent updates
- 🐛 Inaccurate battery readings
- 🔋 High battery consumption
- 🐛 Compatibility issues with newer devices/OS
How Long Left
From 40 App Store ratingsWhat we love
- 👍 Great for staying organized
- 👍 Useful for busy schedules
- 👍 Excellent for time management
- 👍 Helpful for tracking time left
- 👍 Good for school/work schedules
Room to improve
- 🐛 Watch complication not working
- 🐛 Broken restore purchases
- 🐛 UI is unattractive
- 🐛 MacOS app won't open
- 🐛 Widget doesn't work
Bugs and requests
BatteryPhone
Reported bugs
3 issues- Complication not updating
- App crashing on launch
- Incorrect battery percentage displayed
Requested features
4 requests- Customizable update frequency
- Support for AirPods/Bluetooth device battery monitoring
- Notification when device is fully charged
- Ability to select which device's battery is displayed on complication
How Long Left
Reported bugs
17 issues- Watch complication/widget doesn't update correctly
- Current feed no longer displays current events
- Restore purchases button is broken
- Developer ignores emails
- MacOS app won't open
Show 12 moreShow fewer
- Widget doesn't work on iOS 17
- Complication countdown bugged (time until end of next event)
- Complication shows wrong time remaining
- Tiny complications don't work
- Corner complications display wrong time left
- Widget only counts down for beginning of event, not start
- In-app purchase disappears on uninstall/reinstall
- Can't add as complication or widget
- Calendars do not sync to Apple Watch
- Always On Display shows empty time remaining
- Empty widget sometimes
- Refresh rate issue (doesn't update when calendar moved)
Requested features
7 requests- Update to iOS 26/27 widgets
- Update to Apple Watch smart widgets
- Add custom event for future dates
- Widget for upcoming events
- Restrict event display time
Show 2 moreShow fewer
- Add percentage to Apple Watch interface
- Home Screen widget
In-app purchases
BatteryPhone
No in-app purchases
How Long Left
- How Long Left Widget$1.99
- Premium Watch Complication$4.99
- Legacy Pro Lifetime$39.99
Show 1 moreShow fewer
- How Long Left Pro (Lifetime)$49.99
Questions
Is BatteryPhone free?
Is How Long Left free?
Which has better reviews, BatteryPhone or How Long Left?
Do BatteryPhone or How Long Left have ads?
Which is updated more often, BatteryPhone or How Long Left?
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