# Countdown & Calendar vs AI Usage

The clearest difference is in-app purchases: AI Usage at none against Countdown & Calendar's 1. AI Usage also leads on update cadence (every 11 days vs every 65 months) and device support. Countdown & Calendar's advantage is iOS requirement (16.4 vs 18.0). On price there is nothing between them.

Both are free to download. Countdown & Calendar sells 1 one-off in-app purchase. AI Usage asks for nothing beyond the download.

Countdown & Calendar ships an update every 65 months, AI Usage every 11 days. The most recent releases landed on September 8, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Countdown & Calendar | AI Usage |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | — | No |
| Update frequency | Every 65 months | **Every 11 days** |
| Size | 66 MB | 17 MB |
| Requires iOS | **16.4** | 18.0 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Thieu Khue](https://appshunter.io/developer/1554439862) | [Seung-Un Ham](https://appshunter.io/developer/447543367) |

## What reviewers say

### Countdown & Calendar

[App page](https://appshunter.io/ios/app/countdown-and-calendar/id1554439860)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro | $4.99 | one-time |


### AI Usage

[App page](https://appshunter.io/ios/app/ai-usage/id6753959146)

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

**In-app purchases:** none


## Frequently asked questions

### Is Countdown & Calendar free?

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

### Is AI Usage free?

AI Usage is free to download, with no in-app purchases.

### Which is updated more often, Countdown & Calendar or AI Usage?

Countdown & Calendar ships an update every 65 months, and AI Usage every 11 days. Most recently, Countdown & Calendar was updated on September 8, 2026 and AI Usage on September 20, 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.*