Comparison

Basic Calculator+ vs 12Calendar

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

Head to head
About

Basic Calculator+

Perform essential arithmetic operations with a straightforward calculator app. Its large buttons and clear display ensure ease of use, supporting both portrait and landscape orientations.

Highlights
  • Basic four functions
  • Clear display
  • Large buttons
  • Portrait and landscape modes
  • iPad compatible
Features
Read full description

This simple calculator with a clear display and large buttons makes calculations easy. Portrait and landscape modes both available on iPad. This app uses the basic functions of the calculator to make the simplest, best, free calculator in the app store.

About

12Calendar

Customize your lock screen with a calendar. Choose from various layouts, fonts, and colors to display your schedule conveniently. Add custom holidays by importing from your device's calendar.

Highlights
  • Customizable calendar layouts
  • Selectable fonts and colors
  • Adjustable transparency and frame borders
  • Add custom holiday data
  • Import holidays from iOS calendar
  • Display year, month, and day of the week
Read full description

Every time you open your lock screen, a beautiful calendar is right there to greet you. That's the everyday experience 12Calendar creates. Customize fonts, colors, and layouts to build a calendar wallpaper that's uniquely yours — simply and easily. ■ Layouts Choose from 28 calendar layouts. Free Layout mode lets you drag and resize each calendar freely. - You can change the size from the popup that appears when you tap the calendar. ■ Customize Every Detail - Individual color settings for weekdays, Saturdays, and Sundays - Day-of-week display language - 12 fonts with adjustable text size - Background opacity and border visibility - Week start day (Sunday or Monday) ■ Holiday Support Add holidays manually within the app. With an in-app purchase, holidays can be imported from your iOS Calendar. ■ How to Set Your Wallpaper After saving your calendar, set it as your wallpaper via the Photos app or iOS Settings. (Wallpaper cannot be changed directly from within this app.) ※ App Store screenshots were created using Screenshots.pro.

Screenshots

Basic Calculator+2 screens
12Calendar4 screens

Verdict

The call

The clearest difference is rating: Basic Calculator+ at 4.9 against 12Calendar's 3.2. Basic Calculator+ also leads on in-app purchases (none vs 4) and review sentiment (87% vs 62%). 12Calendar's advantage is ads (none vs shown). On price, update cadence and monetization model 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. 12Calendar sells 4 one-off in-app purchases. Basic Calculator+ asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Basic Calculator+ holds the better App Store score, 4.9 against 3.2. That said, the two scores are not equally well evidenced: Basic Calculator+ has 260K ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 87% of Basic Calculator+'s written reviews are positive against 62% of 12Calendar's.

UpkeepUpdate frequency

Basic Calculator+ ships an update every 4 months, 12Calendar every 3 months. The most recent releases landed on October 18, 2026 and October 16, 2026 respectively.

Scorecard7 real differences · 3 level
Basic Calculator+ versus 12Calendar: the parameters behind the verdict, then further details
ParameterBasic Calculator+12Calendar
PriceFreeFree
Rating4.9 (260K ratings) — better3.2 (11 ratings)
Positive reviews87.4% of reviews — better61.5% of reviews
Number of ratings260K — better11
Update frequencyEvery 4 monthsEvery 3 months — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPod
Requires iOS15.0 — better17.0
Further details — not scored
Size50 MB3 MB
Age rating4+4+
DeveloperBest Free Appslagoon

Customer experience

Basic Calculator+

All ratings259,935 ratings
Positive97.5%
Neutral1.8%
Negative0.7%
Written reviews548 reviews
Positive87.4%
Neutral1.5%
Negative11.1%

12Calendar

All ratings11 ratings
Positive45.5%
Neutral18.2%
Negative36.4%
Written reviews65 reviews
Positive61.5%
Neutral20.0%
Negative18.5%

Bugs and requests

Basic Calculator+

Reported bugs

2 issues
  • Incorrect calculation results
  • Ads covering the screen

Requested features

3 requests
  • Add fraction button
  • Implement order of operations
  • Include memory function

12Calendar

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Basic Calculator+

No in-app purchases

4 purchases

12Calendar

One-time4
  • UpgradeFree
  • Hide Logo & SAVE available$0.99
  • Enable load calendar$0.99
Show 1 more
  • Clear all functional limitation$1.99

Questions

Is Basic Calculator+ free?
Basic Calculator+ is free to download, with no in-app purchases.
Is 12Calendar free?
12Calendar is free to download, with in-app purchases available.
Which has better reviews, Basic Calculator+ or 12Calendar?
Basic Calculator+ is rated higher. Basic Calculator+ averages 4.9 out of 5 from 260K ratings, while 12Calendar averages 3.2 from 11 ratings.
Do Basic Calculator+ or 12Calendar have ads?
Basic Calculator+ shows ads; 12Calendar does not.
Which is updated more often, Basic Calculator+ or 12Calendar?
Basic Calculator+ ships an update every 4 months, and 12Calendar every 3 months. Most recently, Basic Calculator+ was updated on October 18, 2026 and 12Calendar on October 16, 2026.

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