# DayInBook vs FIRE Countdown

The clearest difference is in-app purchases: FIRE Countdown at none against DayInBook's 4. FIRE Countdown also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). DayInBook's advantage is ads (none vs shown) and update cadence (every 3 days vs every 2 weeks). On price there is nothing between them.

Both are free to download. DayInBook sells 4 in-app purchases, starting at $1.99 per month. FIRE Countdown asks for nothing beyond the download.

DayInBook ships an update every 3 days, FIRE Countdown every 2 weeks. The most recent releases landed on October 4, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | DayInBook | FIRE Countdown |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 2 weeks |
| Size | 15 MB | 23 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [阳 曹](https://appshunter.io/developer/1599300891) | [Naoyuki Maeda](https://appshunter.io/developer/1570141186) |

## What reviewers say

### DayInBook

[App page](https://appshunter.io/ios/app/dayinbook-fire/id6756570968)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO月订阅 | $1.99 | per month |
| PRO年订阅 | $9.99 | per year |
| AI积分100 | $1.99 | one-time |
| AI积分1000 | $17.99 | one-time |


### FIRE Countdown

[App page](https://appshunter.io/ios/app/fire-countdown/id6759857140)

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

**In-app purchases:** none


## Frequently asked questions

### Is DayInBook free?

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

### Is FIRE Countdown free?

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

### Do DayInBook or FIRE Countdown have ads?

FIRE Countdown shows ads; DayInBook does not.

### Which is updated more often, DayInBook or FIRE Countdown?

DayInBook ships an update every 3 days, and FIRE Countdown every 2 weeks. Most recently, DayInBook was updated on October 4, 2026 and FIRE Countdown 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.*