Basic Calculator+ vs 12Calendar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Basic four functions
- Clear display
- Large buttons
- Portrait and landscape modes
- iPad compatible
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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.
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: 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
Both are free to download. 12Calendar sells 4 one-off in-app purchases. Basic Calculator+ asks for nothing beyond the download.
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.
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.
| Parameter | Basic Calculator+ | 12Calendar |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (260K ratings) — better | 3.2 (11 ratings) |
| Positive reviews | 87.4% of reviews — better | 61.5% of reviews |
| Number of ratings | 260K — better | 11 |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPod |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 50 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Best Free Apps | lagoon |
Customer experience
Basic Calculator+
12Calendar
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
Basic Calculator+
No in-app purchases
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 Basic Calculator+ free?
Is 12Calendar free?
Which has better reviews, Basic Calculator+ or 12Calendar?
Do Basic Calculator+ or 12Calendar have ads?
Which is updated more often, Basic Calculator+ or 12Calendar?
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