Comparison

BatteryPhone vs How Long Left

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

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.

Highlights
  • Countdown calendar events
  • Today Widget integration
  • Siri integration
  • Apple Watch app
  • Time remaining notifications
  • Apple Watch complications
Features
Read full description

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

BatteryPhone4 screens
How Long Left4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. How Long Left sells 4 one-off in-app purchases. BatteryPhone asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

BatteryPhone ships an update every 2 months, How Long Left every 4 months. Both last shipped on November 2, 2026.

Scorecard6 real differences · 4 level
BatteryPhone versus How Long Left: the parameters behind the verdict, then further details
ParameterBatteryPhoneHow Long Left
PriceFreeFree
Rating3.6 (156 ratings)3.8 (40 ratings) — better
Positive reviews53.7% of reviews58.5% of reviews — better
Number of ratings156 — better40
Update frequencyEvery 2 months — betterEvery 4 months
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
DevicesiPhone, iPod, Apple WatchiPhone, iPad, iPod, Apple Watch — better
Requires iOS15.012.0 — better
Further details — not scored
Size7 MB27 MB
Age rating4+4+
DeveloperKeietsu YasuharaRyan Kontos

Customer experience

BatteryPhone

All ratings156 ratings
Positive60.9%
Neutral14.1%
Negative25.0%
Written reviews134 reviews
Positive53.7%
Neutral14.2%
Negative32.1%

How Long Left

All ratings39 ratings
Positive66.7%
Neutral10.3%
Negative23.1%
Written reviews41 reviews
Positive58.5%
Neutral17.1%
Negative24.4%

User reviews

BatteryPhone

From 156 App Store ratings

What 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 ratings

What 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 more
  • 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 more
  • Add percentage to Apple Watch interface
  • Home Screen widget

In-app purchases

None

BatteryPhone

No in-app purchases

4 purchases

How Long Left

One-time4
  • How Long Left Widget$1.99
  • Premium Watch Complication$4.99
  • Legacy Pro Lifetime$39.99
Show 1 more
  • How Long Left Pro (Lifetime)$49.99

Questions

Is BatteryPhone free?
BatteryPhone is free to download, with no in-app purchases.
Is How Long Left free?
How Long Left is free to download, with in-app purchases available.
Which has better reviews, BatteryPhone or How Long Left?
How Long Left is rated higher. BatteryPhone averages 3.6 out of 5 from 156 ratings, while How Long Left averages 3.8 from 40 ratings.
Do BatteryPhone or How Long Left have ads?
BatteryPhone shows ads; How Long Left does not.
Which is updated more often, BatteryPhone or How Long Left?
BatteryPhone ships an update every 2 months, and How Long Left every 4 months. Most recently, BatteryPhone was updated on November 2, 2026 and How Long Left on November 2, 2026.

Other comparisons