Comparison

BatteryPhone vs Kantan Clock

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

Kantan Clock

Track time across multiple cities with a clean, minimalist world clock. Organize your most important locations and view times at a glance with a home screen widget. Supports StandBy mode for easy viewing.

Highlights
  • Add and organize cities
  • 12/24 hour format switching
  • Clean, minimal interface
  • Home Screen widget
  • StandBy mode support
Features
Read full description

Kantan Clock is a thoughtfully designed world clock that helps you track time across cities without clutter or distraction. • Add and organize the cities that matter most to you. • Switch between 12-hour and 24-hour formats. • Enjoy a clean, minimal interface built for focus. • Use the Home Screen widget to see the time at a glance. • Supports StandBy.

Screenshots

BatteryPhone4 screens
Kantan Clock4 screens

Verdict

The call

The clearest difference is price: BatteryPhone at Free against Kantan Clock's $0.99. BatteryPhone also leads on ratings volume (156 vs 1). Kantan Clock's advantage is rating (5.0 vs 3.6) and ads (none vs shown). On 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

CostPrice · In-app purchases · Ads · Monetization

BatteryPhone is free to download; Kantan Clock costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Kantan Clock holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: BatteryPhone has 156 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

BatteryPhone ships an update every 2 months, Kantan Clock every 4 days. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

Scorecard6 real differences · 4 level
BatteryPhone versus Kantan Clock: the parameters behind the verdict, then further details
ParameterBatteryPhoneKantan Clock
PriceFree — better$0.99
Rating3.6 (156 ratings)5.0 (1 ratings) — better
Positive reviews53.7% of reviews—
Number of ratings156 — better1
Update frequencyEvery 2 monthsEvery 4 days — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supported — betterPaid
DevicesiPhone, iPod, Apple Watch — betteriPhone, iPad
Requires iOS15.0 — better16.0
Further details — not scored
Size7 MB1 MB
Age rating4+4+
DeveloperKeietsu YasuharaAndres Iga Salas

Customer experience

BatteryPhone

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

Kantan Clock

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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

Kantan Clock

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

BatteryPhone

No in-app purchases

None

Kantan Clock

No in-app purchases

Questions

Is BatteryPhone free?
BatteryPhone is free to download, with no in-app purchases.
Is Kantan Clock free?
Kantan Clock costs $0.99, with no in-app purchases.
Which has better reviews, BatteryPhone or Kantan Clock?
Kantan Clock is rated higher. BatteryPhone averages 3.6 out of 5 from 156 ratings, while Kantan Clock averages 5.0 from 1 ratings.
Do BatteryPhone or Kantan Clock have ads?
BatteryPhone shows ads; Kantan Clock does not.
Which is updated more often, BatteryPhone or Kantan Clock?
BatteryPhone ships an update every 2 months, and Kantan Clock every 4 days. Most recently, BatteryPhone was updated on October 24, 2026 and Kantan Clock on October 20, 2026.

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