Calculator Plus #1 vs 12Calendar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Basic arithmetic operations
- Calculation history
- Memory function
- Percentage calculations
- Large buttons and display
- Customizable themes
- Multi-window mode
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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.
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | Calculator Plus #1 | 12Calendar |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5.1K ratings) — better | 3.2 (11 ratings) |
| Positive reviews | 88.5% of reviews — better | 61.5% of reviews |
| Number of ratings | 5.1K — better | 11 |
| Update frequency | Every 5 weeks — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15 — better | 17.0 |
| Further details — not scored | ||
| Size | 157 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | DigitAlchemy LLC | lagoon |
Customer experience
Calculator Plus #1
12Calendar
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
Calculator Plus #1
- 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
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- Simple Calculator - No Ads7 Days trial$8.991 Year
- Remove ads$3.99
- Multiple Basic Calculations$8.99
- Multiple Basic Calculations$12.99
12Calendar
- UpgradeFree
- Hide Logo & SAVE available$0.99
- Enable load calendar$0.99
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- Clear all functional limitation$1.99
Questions
Is Calculator Plus #1 free?
Is 12Calendar free?
Which has better reviews, Calculator Plus #1 or 12Calendar?
Do Calculator Plus #1 or 12Calendar have ads?
Which is updated more often, Calculator Plus #1 or 12Calendar?
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