# addition calc vs Inbox Zero

The clearest difference is in-app purchases: addition calc at none against Inbox Zero's 3. addition calc also leads on iOS requirement (9.3 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. Inbox Zero sells 3 in-app purchases, starting at $6.99 per 7 days. addition calc asks for nothing beyond the download.

## The numbers

| Metric | addition calc | Inbox Zero |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | — |
| Monetization | Free | — |
| Size | 13 MB | 108 MB |
| Requires iOS | **9.3** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shozo Obayashi](https://appshunter.io/developer/1453986142) | [Mehmet Turkmen](https://appshunter.io/developer/1478507004) |

## What reviewers say

### addition calc

[App page](https://appshunter.io/ios/app/addition-calc/id1453986143)

This calculator app clearly displays inputs and sums on separate rows for easy understanding. Perform basic arithmetic operations with large, accessible buttons. Customize decimal places and rounding for precise calculations.

**Highlights:** Separate input and sum display, Large buttons for easy input, Supports four input operations, Customizable decimal places, Adjustable rounding settings, Optional vibration feedback

**Features:** macOS Compatibility

**In-app purchases:** none


### Inbox Zero

[App page](https://appshunter.io/ios/app/inbox-zero-ai-mail-coach/id6747061594)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $6.99 | per 7 days |
| Monthly | $14.99 | per month |
| Annualy | $59.99 | per year |


## Frequently asked questions

### Is addition calc free?

addition calc is free to download, with no in-app purchases.

### Is Inbox Zero free?

Inbox Zero is free to download, with in-app purchases available.

### Do addition calc or Inbox Zero have ads?

Neither addition calc nor Inbox Zero shows ads.

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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.*