# Gradation Calculator vs Countdown Days

The clearest difference is in-app purchases: Gradation Calculator at none against Countdown Days's 3. Countdown Days's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.2). On price and ads there is nothing between them.

Both are free to download. Countdown Days sells 3 in-app purchases, starting at $1.29 per month. Gradation Calculator asks for nothing beyond the download.

## The numbers

| Metric | Gradation Calculator | Countdown Days |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 5 weeks |
| Size | 6 MB | 45 MB |
| Requires iOS | 18.2 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [MASATO MISAWA](https://appshunter.io/developer/1609449895) | [长宏 侯](https://appshunter.io/developer/1726037103) |

## What reviewers say

### Gradation Calculator

[App page](https://appshunter.io/ios/app/gradation-calculator/id6777311428)

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

**In-app purchases:** none


### Countdown Days

[App page](https://appshunter.io/ios/app/countdown-days-events-and-widgets/id6792184671)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Monthly) | $1.29 | per month |
| Pro (Yearly) | $9.99 | per year |
| Pro (Lifetime) | $24.99 | one-time |


## Frequently asked questions

### Is Gradation Calculator free?

Gradation Calculator is free to download, with no in-app purchases.

### Is Countdown Days free?

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

### Do Gradation Calculator or Countdown Days have ads?

Neither Gradation Calculator nor Countdown Days 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.*