# Event Days Timer vs 序日

The clearest difference is price: 序日 at Free against Event Days Timer's $0.99. 序日 also leads on update cadence (daily vs every 9 days) and iOS requirement (18.0 vs 26.0). Event Days Timer's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

序日 is free to download; Event Days Timer costs $0.99 up front. 序日 sells 1 one-off in-app purchase. Event Days Timer asks for nothing beyond the download.

Event Days Timer ships an update every 9 days, 序日 daily. The most recent releases landed on October 9, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Event Days Timer | 序日 |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Daily** |
| Monetization | Paid | — |
| Size | 6 MB | 19 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Wujie Yibang (fuzhou) Software Technology Co., Ltd](https://appshunter.io/developer/1895443936) | [琦 张](https://appshunter.io/developer/6811089301) |

## What reviewers say

### Event Days Timer

[App page](https://appshunter.io/ios/app/event-days-timer-countdown/id6790069435)

Track time elapsed and remaining for important dates like anniversaries, exams, and deadlines. Organize events into past, future, or recurring lists with customizable display units and system alarms. Sync data across devices and personalize the look with various themes and widgets.

**Highlights:** Elapsed, Countdown, and Recurring event lists, Customizable display units (year, month, day, hour, minute, second), System-level alarms with default ringtone, Home screen widgets and lock-screen layouts, Optional iCloud sync for data, Gregorian and lunar calendar support, Archiving of past events

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

**In-app purchases:** none


### 序日

[App page](https://appshunter.io/ios/app/id6811274043)

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 序日 Pro · One-time Purchase | $1.99 | one-time |


## Frequently asked questions

### Is Event Days Timer free?

Event Days Timer costs $0.99, with no in-app purchases.

### Is 序日 free?

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

### Do Event Days Timer or 序日 have ads?

Neither Event Days Timer nor 序日 shows ads.

### Which is updated more often, Event Days Timer or 序日?

Event Days Timer ships an update every 9 days, and 序日 daily. Most recently, Event Days Timer was updated on October 9, 2026 and 序日 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.*