# Katalog vs Countdown Reminder

The clearest difference is in-app purchases: Katalog at none against Countdown Reminder's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Countdown Reminder sells 2 in-app purchases, starting at $0.99 per month. Katalog asks for nothing beyond the download.

Katalog ships an update every 10 days, Countdown Reminder weekly. The most recent releases landed on September 9, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Katalog | Countdown Reminder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Weekly** |
| Size | 56 MB | 59 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [103 NPT DIGITAL TECHNOLOGY PLC.](https://appshunter.io/developer/1708852072) | [国飞 闫](https://appshunter.io/developer/1703504926) |

## What reviewers say

### Katalog

[App page](https://appshunter.io/ios/app/katalog/id6744877299)

**In-app purchases:** none


### Countdown Reminder

[App page](https://appshunter.io/ios/app/countdown-reminder-key-days/id6754815787)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month VIP | $0.99 | per month |
| Permanent VIP | $3.99 | one-time |


## Frequently asked questions

### Is Katalog free?

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

### Is Countdown Reminder free?

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

### Do Katalog or Countdown Reminder have ads?

Neither Katalog nor Countdown Reminder shows ads.

### Which is updated more often, Katalog or Countdown Reminder?

Katalog ships an update every 10 days, and Countdown Reminder weekly. Most recently, Katalog was updated on September 9, 2026 and Countdown Reminder on September 21, 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.*