# ShiftProCalendar vs inzone

The clearest difference is iOS requirement: inzone at 15.1 against ShiftProCalendar's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. ShiftProCalendar sells 2 in-app purchases, starting at $0.99 per month and inzone sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ShiftProCalendar ships an update every 2 months, inzone every 5 weeks. The most recent releases landed on September 19, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | ShiftProCalendar | inzone |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 20 MB | 55 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [LI JUNYI](https://appshunter.io/developer/1863692375) | [Burak Furkan Koken](https://appshunter.io/developer/6789995348) |

## What reviewers say

### ShiftProCalendar

[App page](https://appshunter.io/ios/app/shiftprocalendar/id6761934926)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Pro Lifetime Access | $29.99 | one-time |


### inzone

[App page](https://appshunter.io/ios/app/inzone-adhd-study-timer/id6789995346)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Founders Edition | $1.99 | per month |
| inzone Premium | $3.99 | per month |
| Founders Edition Annual | $29.99 | per year |
| inzone Premium Annual | $39.99 | per year |


## Frequently asked questions

### Is ShiftProCalendar free?

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

### Is inzone free?

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

### Do ShiftProCalendar or inzone have ads?

Neither ShiftProCalendar nor inzone shows ads.

### Which is updated more often, ShiftProCalendar or inzone?

ShiftProCalendar ships an update every 2 months, and inzone every 5 weeks. Most recently, ShiftProCalendar was updated on September 19, 2026 and inzone on September 9, 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.*