Comparison

Calculator Plus #1 vs 12Calendar

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

Head to head
About

Calculator Plus #1

A straightforward calculator app designed for everyday math, school, budgeting, and shopping. It offers essential functions, a clear interface with large buttons, and a history log for reviewing past calculations. Advanced features include memory functions, percentage calculations, and multi-window support for efficient workflow.

Highlights
  • Basic arithmetic operations
  • Calculation history
  • Memory function
  • Percentage calculations
  • Large buttons and display
  • Customizable themes
  • Multi-window mode
Features
Read full description

All-in-one basic calculator app for iPhone and iPad. Calculator Plus combines a basic calculator and a scientific one, percentage and tax calculator, financial and date calculator, currency and unit converter in one easy-to-use app. Stop switching between multiple calculator apps. Calculate faster, stay organized, and get accurate results with Calculator Plus. * Looking for a basic calculator with history and memory? * Calculator Plus automatically saves calculations so you can review results, continue calculations later, compare numbers, track expenses, and avoid repeating work. * Need a scientific calculator for school, engineering, or advanced math?* Use logarithms, trigonometric functions, exponents, algebra, scientific formulas, parentheses, and multi-step equations in one powerful calculator. * Need a percentage calculator while shopping? * Whether you’re asking “How much is 20% off?” or “What tip should I leave?”, Calculator Plus delivers accurate answers. Quickly calculate discounts, sales tax, tips, markups, profit margins, percentage increases, and percentage decreases. * Looking for a budgeting and finance calculator? * Track expenses, calculate bills, compare prices, plan budgets, and organize calculations with notes and history. * Need a currency converter and calculator in one app? * Convert currencies and measurement units while performing calculations - ideal for travel, shopping, business, and everyday use. * “How many days until my trip?” * Need a date calculator? Count days, calculate age, track deadlines, plan vacations, and manage important events. * Calculator Widget * Add the widget to your home screen for instant access. * Notes and Saved Calculations * Attach notes to saved calculations to organize expenses, transactions, tax records, budget plans, and currency conversions. * Perfect for: * — Everyday calculations — Scientific calculations and algebra for students — Shopping discounts and percentages — Budgeting, bills, and expenses — Tax and financial calculations — Currency and unit conversion — School homework and study — Multi-step equations with history — Date, age, and days calculations * Why Do Users Choose Calculator Plus? * Many calculator apps focus on only one task. Calculator Plus combines a scientific calculator, financial calculator, percentage calculator, tax calculator, currency converter, unit converter, date calculator, notes, history, widget, and multi-window support in one app. * Who Is Calculator Plus Designed For? * — Students and schoolchildren — Engineers and technical professionals — Business owners and freelancers — Finance professionals — Travellers and shoppers — Families managing household budgets Whether you need a calculator for budgeting, taxes, shopping, school, business, travel, engineering, or everyday math, Calculator Plus gives you all the tools you need in one app.

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

Calculator Plus #14 screens
12Calendar4 screens

Verdict

The call

The clearest difference is rating: Calculator Plus #1 at 4.8 against 12Calendar's 3.2. Calculator Plus #1 also leads on review sentiment (89% vs 62%) and ratings volume (5.1K vs 11). 12Calendar's advantage is ads (none vs shown). On price, in-app purchases, monetization model 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. Calculator Plus #1 sells 7 in-app purchases, starting at $0.99 per month and 12Calendar sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Calculator Plus #1 holds the better App Store score, 4.8 against 3.2. That said, the two scores are not equally well evidenced: Calculator Plus #1 has 5.1K ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 89% of Calculator Plus #1's written reviews are positive against 62% of 12Calendar's.

UpkeepUpdate frequency

Calculator Plus #1 ships an update every 5 weeks, 12Calendar every 3 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

Scorecard6 real differences · 4 level
Calculator Plus #1 versus 12Calendar: the parameters behind the verdict, then further details
ParameterCalculator Plus #112Calendar
PriceFreeFree
Rating4.8 (5.1K ratings) — better3.2 (11 ratings)
Positive reviews88.5% of reviews — better61.5% of reviews
Number of ratings5.1K — better11
Update frequencyEvery 5 weeks — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15 — better17.0
Further details — not scored
Size157 MB3 MB
Age rating4+4+
DeveloperDigitAlchemy LLClagoon

Customer experience

Calculator Plus #1

All ratings5,067 ratings
Positive97.2%
Neutral1.5%
Negative1.3%
Written reviews1,306 reviews
Positive88.5%
Neutral3.0%
Negative8.5%

12Calendar

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

Bugs and requests

Calculator Plus #1

Reported bugs

2 issues
  • App crashes or doesn't open
  • Ads still show up even after paying to remove them

Requested features

3 requests
  • Add brackets/parentheses for arithmetic operations
  • Improve arithmetic operator priority
  • Add more algebraic and trigonometric functions

12Calendar

Not enough reviews yet to summarise bugs or requests.

In-app purchases

7 purchases

Calculator Plus #1

Subscriptions4
  • Calculator with History7 Days trial$0.991 Month
  • Calculator with History7 Days trial$1.491 Month
  • Simple Calculator - No Ads7 Days trial$6.291 Year
Show 1 more
  • Simple Calculator - No Ads7 Days trial$8.991 Year
One-time3
  • Remove ads$3.99
  • Multiple Basic Calculations$8.99
  • Multiple Basic Calculations$12.99
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 Calculator Plus #1 free?
Calculator Plus #1 is free to download, with in-app purchases available.
Is 12Calendar free?
12Calendar is free to download, with in-app purchases available.
Which has better reviews, Calculator Plus #1 or 12Calendar?
Calculator Plus #1 is rated higher. Calculator Plus #1 averages 4.8 out of 5 from 5.1K ratings, while 12Calendar averages 3.2 from 11 ratings.
Do Calculator Plus #1 or 12Calendar have ads?
Calculator Plus #1 shows ads; 12Calendar does not.
Which is updated more often, Calculator Plus #1 or 12Calendar?
Calculator Plus #1 ships an update every 5 weeks, and 12Calendar every 3 months. Most recently, Calculator Plus #1 was updated on November 6, 2026 and 12Calendar on November 1, 2026.

Other comparisons