# Zen Flip Clock vs Calculator for iPad +

The clearest difference is monetization model: Zen Flip Clock at free with in-app purchases against Calculator for iPad +'s subscription. Zen Flip Clock also leads on ads (none vs shown) and rating (4.7 vs 4.3). On price, ratings volume, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Zen Flip Clock sells 3 in-app purchases, starting at $0.99 per month and Calculator for iPad + sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Zen Flip Clock holds the better App Store score, 4.7 against 4.3. Both are backed by a comparable volume of ratings — 6.2K and 3.6K respectively. Written reviews point the same way: 72% of Zen Flip Clock's written reviews are positive against 61% of Calculator for iPad +'s.

Zen Flip Clock ships an update every 2 weeks, Calculator for iPad + every 4 weeks. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Zen Flip Clock | Calculator for iPad + |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (6.2K ratings)](https://appshunter.io/ios/app/zen-flip-clock-minimal-timer/id1265404088/reviews)** | [4.3 (3.6K ratings)](https://appshunter.io/ios/app/calculator-for-ipad-plus/id1288059768/reviews) |
| Number of ratings | **6.2K** | 3.6K |
| Positive reviews | **71.5% of reviews** | 60.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 weeks** | Every 4 weeks |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 104 MB | 19 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chaoyang Minimal Software Studio](https://appshunter.io/developer/1065436362) | [Beijing Free Calculator Technology Co., Ltd.](https://appshunter.io/developer/1457813265) |

## What reviewers say

### Zen Flip Clock

[App page](https://appshunter.io/ios/app/zen-flip-clock-minimal-timer/id1265404088)

This app offers a minimalist clock experience with multiple themes and powerful focus tools. It functions as a fullscreen desk clock and includes a Pomodoro timer, stopwatch, and hourly chime to help manage time and improve productivity.

**Highlights:** Multiple clock themes (flip, digital, minimalist), Fullscreen desk clock functionality, Pomodoro timer for focused work sessions, Stopwatch for timing tasks, Hourly chime for routine building, Time usage statistics, Home and lock screen widgets

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro | $0.99 | per month |
| Yearly Pro | $4.99 | per year |
| Lifetime Pro | $9.99 | one-time |

**What reviewers like**

- 🚀 Amazing app
- 👍 Aesthetic and minimalistic
- 👍 Useful for studying and productivity
- 👍 Simple and easy to use
- 👍 Great for a desk clock

**What reviewers complain about**

- 🐛 Time display issues
- 🐛 Widget not working as expected
- 🐛 Pomodoro timer resets when switching apps
- 🔋 High battery consumption
- 💰 Paid features required for full functionality

**Reported bugs**

- Time display inaccuracies
- Widget freezing and displaying incorrect time
- Pomodoro timer not working as expected
- Compatibility issues with latest iOS updates
- App crashing or becoming unresponsive

**Requested features**

- Add alarm functionality
- Implement live activities support
- Allow custom pomodoro timer durations
- Provide more theme/color options
- Add world clock/timezone support


### Calculator for iPad +

[App page](https://appshunter.io/ios/app/calculator-for-ipad-plus/id1288059768)

This app offers a scientific calculator experience designed for iPads. It provides unlimited access to all content and features through a monthly subscription. Pricing may vary by region, and subscriptions can be managed through account settings.

**Highlights:** Scientific calculator functionality, Unlimited access to content, iPad optimized interface, Subscription management, Auto-renewing subscription option

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly VIP | $2.99 | per month |
| Calculator permanent purchase | $9.99 | one-time |

**What reviewers like**

- 👍 Functional and easy to use
- 🚀 Fast calculations
- 💡 Helpful for school/homework
- 🎨 Customizable design

**What reviewers complain about**

- 🔍 Too many ads/in-app purchases
- 🐛 Inaccurate calculations
- 💰 Subscription model for basic features
- 🔒 Privacy concerns with permissions

**Reported bugs**

- Buttons not responsive
- History/calculation display issues
- Conversion feature not working properly

**Requested features**

- Fraction support
- Memory function
- Handwriting recognition improvements
- No ads for paid users


## Frequently asked questions

### Is Zen Flip Clock free?

Zen Flip Clock is free to download, with in-app purchases available.

### Is Calculator for iPad + free?

Calculator for iPad + is free to download, with in-app purchases available.

### Which has better reviews, Zen Flip Clock or Calculator for iPad +?

Zen Flip Clock is rated higher. Zen Flip Clock averages 4.7 out of 5 from 6.2K ratings, while Calculator for iPad + averages 4.3 from 3.6K ratings.

### Do Zen Flip Clock or Calculator for iPad + have ads?

Calculator for iPad + shows ads; Zen Flip Clock does not.

### Which is updated more often, Zen Flip Clock or Calculator for iPad +?

Zen Flip Clock ships an update every 2 weeks, and Calculator for iPad + every 4 weeks. Most recently, Zen Flip Clock was updated on October 23, 2026 and Calculator for iPad + on October 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*