# OneDay vs 1DayS

The clearest difference is in-app purchases: 1DayS at none against OneDay's 3. 1DayS also leads on review sentiment (100% vs 88%) and iOS requirement (12.0 vs 16.0). OneDay's advantage is update cadence (every 2 weeks vs every 3 weeks). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. OneDay sells 3 in-app purchases, starting at $0.99 per month. 1DayS asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for OneDay against 5.0 for 1DayS. Both are backed by a comparable volume of ratings — 4 and 2 respectively. Written reviews are what separate them: 88% of OneDay's written reviews are positive against 100% of 1DayS's.

OneDay ships an update every 2 weeks, 1DayS every 3 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | OneDay | 1DayS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/oneday-countdown-dreamdays/id1250290965/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/1days/id1668529103/reviews) |
| Number of ratings | **4** | 2 |
| Positive reviews | 87.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 99 MB | 102 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chengdu Reinvent Technology Co., Ltd.](https://appshunter.io/developer/1250290964) | [KAIROS Company Limited](https://appshunter.io/developer/1495144014) |

## What reviewers say

### OneDay

[App page](https://appshunter.io/ios/app/oneday-countdown-dreamdays/id1250290965)

Easily manage important dates and to-do lists for upcoming events and anniversaries. Set reminders, customize themes, and share event images. Track past events and prepare for future ones with this intuitive utility.

**Highlights:** Manage important days and to-do lists, Set reminders for upcoming events, Customize themes and card styles, Generate and share event images, Archive and sort events, Track past events

**Features:** macOS Compatibility, iMessage stickers

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced (Monthly) | $0.99 | per month |
| Advanced (Yearly) | $9.99 | per year |
| Lifetime | $20.99 | one-time |


### 1DayS

[App page](https://appshunter.io/ios/app/1days/id1668529103)

This app helps you track and remember important dates like birthdays, anniversaries, holidays, and deadlines. It offers customizable widgets, cloud synchronization, and a choice of UI themes. Never miss a significant event again with precise reminders.

**Highlights:** Track birthdays, anniversaries, holidays, deadlines, Public and lunar calendar support, Customizable widgets, Cloud synchronization, Multiple background options, One-click public holiday addition, Light and dark UI themes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OneDay free?

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

### Is 1DayS free?

1DayS is free to download, with no in-app purchases.

### Which has better reviews, OneDay or 1DayS?

OneDay and 1DayS are both rated 5.0 out of 5 on the App Store, from 4 and 2 ratings respectively.

### Do OneDay or 1DayS have ads?

Neither OneDay nor 1DayS shows ads.

### Which is updated more often, OneDay or 1DayS?

OneDay ships an update every 2 weeks, and 1DayS every 3 weeks. Most recently, OneDay was updated on November 2, 2026 and 1DayS on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*