# Date and Time Calculator vs Grabook!

The clearest difference is in-app purchases: Date and Time Calculator at none against Grabook!'s 2. Date and Time Calculator also leads on update cadence (every 4 weeks vs every 2 months) and iOS requirement (15.0 vs 17.0). Grabook!'s advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Grabook! sells 2 in-app purchases, starting at $1.99 per year. Date and Time Calculator asks for nothing beyond the download.

Date and Time Calculator ships an update every 4 weeks, Grabook! every 2 months. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Date and Time Calculator | Grabook! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (9.9K ratings)](https://appshunter.io/ios/app/date-and-time-calculator/id552798167/reviews)** | — |
| Number of ratings | **9.9K** | — |
| Positive reviews | 81.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 18 MB | 103 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [山 钟](https://appshunter.io/developer/1289109809) | [迪 兰](https://appshunter.io/developer/6779031188) |

## What reviewers say

### Date and Time Calculator

[App page](https://appshunter.io/ios/app/date-and-time-calculator/id552798167)

Calculate the exact number of days, hours, and seconds between any two dates. This tool also allows you to find the date before or after a specified period, making it useful for tracking deadlines, events, or financial products.

**Highlights:** Calculate time between any two dates, Second-level precision, Calculate future dates, Calculate past dates, Period time calculation

**In-app purchases:** none

**What reviewers like**

- 💡 Helpful for tracking dates and time
- 👍 Simple and easy to use
- 🚀 Accurate calculations
- 🚀 Useful for various purposes (medication management, work timelines, etc.)

**What reviewers complain about**

- 🐛 Ads are intrusive and difficult to close
- 🐛 Compatibility issues on iPad
- 🐛 Bugs with date/time calculations
- 🐛 Language issues with ads

**Reported bugs**

- Date/time calculations not always accurate
- Inability to close ads
- Compatibility issues on certain devices

**Requested features**

- Option to calculate business days
- Ability to save frequently used dates
- 24-hour time format
- Improved user interface


### Grabook!

[App page](https://appshunter.io/ios/app/grabook/id6780227523)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Grabook Pro Annual | $1.99 | per year |
| Grabook Pro Lifetime | $2.99 | one-time |


## Frequently asked questions

### Is Date and Time Calculator free?

Date and Time Calculator is free to download, with no in-app purchases.

### Is Grabook! free?

Grabook! is free to download, with in-app purchases available.

### Do Date and Time Calculator or Grabook! have ads?

Date and Time Calculator shows ads; Grabook! does not.

### Which is updated more often, Date and Time Calculator or Grabook!?

Date and Time Calculator ships an update every 4 weeks, and Grabook! every 2 months. Most recently, Date and Time Calculator was updated on November 6, 2026 and Grabook! on October 31, 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.*