OneDay vs 1DayS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OneDay
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.
- 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
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OneDay - help you manage todo-list and upcoming important days. OneDay Advanced Version: ※ More Pictures ※ ※ More Card Styles ※ ※ ※ More Color Themes ※ ※ ※ ※ More Functions Easy To Use: 1.Add name, date, sort, mark, memo in the item. 2.Add all the tasks you need to complete before the big day arrives. 3.Add all the dates you need to retrospect after the big day passed. 4.Set the wallpaper From the many beautiful pictures. 5.Set reminders for important upcoming events. 6.Simply archive and sort events or anniversaries. 7.Simply edit, accomplish, delete the items you add. 8.Simply generate images to save or share with your friends Special functions can be used: 1.Custom themes: Dark, Light, Spirit, Pink 2.Today event notifications 3.Save images to the album 4.Share on social media: weibo, facebook, twitter Special functions will come: 1.Share on wechat 2.Custom language 3.Custom card style 4.Custom wallpaper images 5.More sorting way 6.iCloud backup 7.Date calculator 8.Use as a widget 9.Supports 3D Touch 10.Unlock using Touch ID 11.Patch Icon countdown 12.Past event notifications 13.Supports widget themes OneDay offers yearly subscriptions. The subscription prices are: $0.99/Year -You can subscribe to yearly plan. The prices are in US dollars. Pricing in other countries may vary and actual charges may be converted to your local currency depending on the country of residence. -Payment will be charged to iTunes Account at confirmation of purchase. -Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the period. -Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. -Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. -Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Privacy Policy: http://docs.onenice.tech/#/OneDay/privacy Terms of Service: http://docs.onenice.tech/#/OneDay/terms Contact us: hi@onenice.tech For enquires you can contact us: hi@onenice.tech
1DayS
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.
- 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
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“1DayS”是你的首选纪念日管理工具,让你不再错过任何重要日子。不管是过去还是未来,亦或是当下,无论是生日、纪念日,还是节日、还款日,亦或是考试倒计时、发工资倒计时,都会精确为您记录和提醒。 亮点功能 l 支持公历/农历 l 多款小组件灵活自定义 l 云端同步,重要日子不怕丢失 l 多款风景背景供选择 l 公共节日一键添加 l 日子长按排序,随心而定 l 浅色深色两套UI主题 隐私声明: https://www.kairusi.com/1days-privacy.html
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 September 10, 2026 and September 14, 2026 respectively.
| Parameter | OneDay | 1DayS |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) | 5.0 (2 ratings) |
| Positive reviews | 87.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 4 — better | 2 |
| Update frequency | Every 2 weeks — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 93 MB | 102 MB |
| Age rating | 4+ | 4+ |
| Developer | Chengdu Reinvent Technology Co., Ltd. | KAIROS Company Limited |
Customer experience
OneDay
1DayS
In-app purchases
OneDay
- Advanced (Monthly)$0.991 Month
- Advanced (Yearly)$9.991 Year
- Lifetime$20.99
1DayS
No in-app purchases








