Comparison

Simple Calendar vs Deco カレンダー

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

Head to head
About

Simple Calendar

Quickly view your monthly schedule and upcoming events with this easy-to-use calendar app. It offers widget support for at-a-glance access to your day and plans, with all data stored securely on your device. Enjoy a comfortable viewing experience with dark mode support.

Highlights
  • Monthly schedule overview
  • Quick event registration
  • Widget support for daily plans
  • Secure on-device data storage
  • Dark mode compatibility
Features
Read full description

【Features】 ● You can check your schedule for the month at a glance.   You can quickly register your events and check them quickly.   There are no complicated settings before using the calendar. ● Widget support   You can quickly check the date, day of the week, and future plans for the day with the widget. We have added a monthly calendar to the widget. If you change the day of the week in the app, it will be reflected in the widget. ● The security is safe and secure.   The information you add to the calendar is stored only on your device. You can use the calendar with peace of mind because the information is not sent to an external server. ●You can also use it in dark mode, which is easy on the eyes. This app also supports dark mode, so you can use it in dark mode, which is easy on the eyes. [Premium Plan (optional)] An auto-renewable subscription that unlocks all color themes, photo backgrounds, and custom colors. - Monthly: $1.99/month - Yearly: $11.99/year (7-day free trial included) Payment will be charged to your Apple ID account. The subscription renews automatically unless canceled at least 24 hours before the end of the current period. You can manage or cancel your subscription anytime in your App Store account settings. * If you previously purchased "Remove Ads", ads stay hidden without a subscription. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://calendar.heart-relay.com/privacy-policy/

About

Deco カレンダー

Personalize your calendar with a variety of stylish wallpapers and themes. Easily manage your schedule with standard calendar functions, including adding, editing, and sharing events. Syncs with iCloud and Google Calendar for seamless integration.

Highlights
  • Customizable image and movie wallpapers
  • Date label font and size options
  • Add, edit, and remove schedules
  • Schedule sharing via mail and SNS
  • Integrated map function
  • Sync with iCloud and Google Calendar
Features
Read full description

Funny Calendar App, "Deco Calendar". Let us decorate calendar to choose your favorite wallpapers! You can choose Cute, Stylish, Simple, and Seasonal wallpapers. Of course, this app is implemented standard functions as Calendar app. # Original Twelve Wallpapers with 12 Months Mainly, wallpapers are designed by several creator's works,both images and movies. You can have a enjoyable experience by swiping through the calendar! You can choose calendar wallpaper templates at the "Deco Store", and you can get free. # Easy to Look as a Calendar. Care Accessibility; You can set calendar's font size and font style. If you have any plans for one day, you can find this schedule by dotted calendar-date label. Dots above the calendar-date label is colored with categorized events, like business or family. #Simply and Useful You can add, edit and delete schedules by tapping date-label. Incorporated interface iOS Standard Calendar App, you can operate familiar to edit schedule. And implemented map function, you can find a place to meet quickly not using map apps. # Sync with iOS Calendar You can sync schedules with your iCould account, and working on other calendars & schedule apps. Even though you uninstall this app, your schedule can be referred by iOS Calendar App and other app. And if you have Google Account, you can sync your schedule with Google Calendar. # Share your Schedule This app is incorporated sharing your schedule via mail, SNS Message, you can share schedule to your family, friend and partner. #Functions of this app - Choice the image and movie wallpapers. - Getting your favorite wallpaper - Choice the date-label fonts - Choice the font size of the date-label (Small / Mid / Large) - Addition, changing, removing the schedule. - Sharing schedules - Display the map - Sync with the iCould and Google Calendar

Screenshots

Simple Calendar4 screens
Deco カレンダー4 screens

Verdict

The call

The clearest difference is in-app purchases: Deco カレンダー at none against Simple Calendar's 3. Deco カレンダー also leads on ads (none vs shown) and iOS requirement (14.0 vs 18.0). Simple Calendar's advantage is rating (4.4 vs 4.0) and ratings volume (73 vs 3). On price, update cadence 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. Simple Calendar sells 3 in-app purchases, starting at $1.99 per month. Deco カレンダー asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Simple Calendar holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: Simple Calendar has 73 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Simple Calendar ships an update every 3 weeks, Deco カレンダー every 5 weeks. The most recent releases landed on October 10, 2026 and October 2, 2026 respectively.

Scorecard6 real differences · 4 level
Simple Calendar versus Deco カレンダー: the parameters behind the verdict, then further details
ParameterSimple CalendarDeco カレンダー
PriceFreeFree
Rating4.4 (73 ratings) — better4.0 (3 ratings)
Positive reviews60.0% of reviews—
Number of ratings73 — better3
Update frequencyEvery 3 weeks — betterEvery 5 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPodiPhone, iPod
Requires iOS18.014.0 — better
Further details — not scored
Size9 MB4 MB
Age rating4+4+
DeveloperHeart Relay Inc.Yuichiro Iwase

Customer experience

Simple Calendar

All ratings68 ratings
Positive88.2%
Neutral4.4%
Negative7.4%
Written reviews10 reviews
Positive60.0%
Neutral20.0%
Negative20.0%

Deco カレンダー

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

3 purchases

Simple Calendar

Subscriptions2
  • Premium Plan (Monthly)$1.991 Month
  • Premium Plan (Yearly)7 Days trial$11.991 Year
One-time1
  • Hide ads$11.99
None

Deco カレンダー

No in-app purchases

Questions

Is Simple Calendar free?
Simple Calendar is free to download, with in-app purchases available.
Is Deco カレンダー free?
Deco カレンダー is free to download, with no in-app purchases.
Which has better reviews, Simple Calendar or Deco カレンダー?
Simple Calendar is rated higher. Simple Calendar averages 4.4 out of 5 from 73 ratings, while Deco カレンダー averages 4.0 from 3 ratings.
Do Simple Calendar or Deco カレンダー have ads?
Simple Calendar shows ads; Deco カレンダー does not.
Which is updated more often, Simple Calendar or Deco カレンダー?
Simple Calendar ships an update every 3 weeks, and Deco カレンダー every 5 weeks. Most recently, Simple Calendar was updated on October 10, 2026 and Deco カレンダー on October 2, 2026.

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