# iDays Pro vs n Matrix Calculator

The clearest difference is device support: iDays Pro at 4 against n Matrix Calculator's 2. iDays Pro also leads on iOS requirement (9.0 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

iDays Pro costs $1.99 and n Matrix Calculator $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iDays Pro ships an update every 3 weeks, n Matrix Calculator monthly. The most recent releases landed on October 26, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | iDays Pro | n Matrix Calculator |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | **[4.7 (80 ratings)](https://appshunter.io/ios/app/idays-pro-elegant-countdown/id1006995319/reviews)** | — |
| Number of ratings | **80** | — |
| Positive reviews | 72.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Paid | — |
| Size | 201 MB | 2 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gerinn LLC](https://appshunter.io/developer/537042831) | [Sota Takasugi](https://appshunter.io/developer/1713502017) |

## What reviewers say

### iDays Pro

[App page](https://appshunter.io/ios/app/idays-pro-elegant-countdown/id1006995319)

This app helps you track and count down to important dates in your life. It offers customizable themes, event reminders, and a date calculator to ensure you never miss a special occasion. Advanced features include Touch ID sign-in and iCloud backup for enhanced privacy and data security.

**Highlights:** Count-down/Count-up events, Multiple themes, Date calculator, User-defined time reminders, Touch ID sign-in, iCloud backup, Apple Watch support

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

**In-app purchases:** none


### n Matrix Calculator

[App page](https://appshunter.io/ios/app/n-matrix-calculator/id6477749139)

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

**In-app purchases:** none


## Frequently asked questions

### Is iDays Pro free?

iDays Pro costs $1.99, with no in-app purchases.

### Is n Matrix Calculator free?

n Matrix Calculator costs $1.99, with no in-app purchases.

### Do iDays Pro or n Matrix Calculator have ads?

Neither iDays Pro nor n Matrix Calculator shows ads.

### Which is updated more often, iDays Pro or n Matrix Calculator?

iDays Pro ships an update every 3 weeks, and n Matrix Calculator monthly. Most recently, iDays Pro was updated on October 26, 2026 and n Matrix Calculator on October 14, 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.*