D vs Onseol
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
D
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Count the days since and until your special dates in one big number. See what weekday your next milestone falls on, and keep a day on your Lock Screen widget. The interface follows your system language in Korean or English. โข Choose from six kinds of dates: relationship, baby, birthday, wedding, upcoming, or custom. โข Choose whether the first day counts as day one. Existing counting settings stay the same until you change them. โข See milestones suited to each kind, including 100 days, months, anniversaries, birthdays, and past milestones. โข Search all days, filter by kind, pin a date, drag your personal order, and preview the next 30 days. โข Repeat Korean lunar birthdays using offline solar-date conversion for 1900โ2050, with a choice of leap-month rules. โข Use small and medium home screen widgets and lock screen widgets. Choose a different day for each widget (iOS 17 or later). โข Set reminders in your local time. Choose date and milestone reminders and their hour. The nearest 60 reminders are refilled when you open the app. โข Celebrate milestones and share square or portrait image cards. Hide the name before sharing; notes are always excluded. โข Calculate the days between dates or a date N days away, then add the result directly. โข Export and restore JSON backups, use dark mode, and follow your system language in Korean or English. No ads, tracking, or account. Your dates stay on your device. Fonts and Korean lunar data are bundled with the app. What's New: A new large-number home and next-day preview, with milestones by kind, Korean lunar recurrence, widget day selection, image cards, and a date calculator. Ads and tracking have been removed while existing dates, backups, and counting settings are preserved. The app icon has also been refreshed.
Onseol
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Onseol counts the days that matter โ no account, no sign-up, no ads. Your D-Days live on your phone. Onseol has no server and keeps no copy. โข Korean-style D-Days โ D-100, D-7, D-DAY, and days-since counted from day 1. 100-day and yearly milestones, automatically. โข Lunar (์๋ ฅ) birthdays & memorials โ Onseol finds the solar date for you each year. โข Home & Lock Screen widgets (iOS 16 or later) โ automatic, or one D-Day of your choice per widget (iOS 17 or later). โข Reminders at D-7, D-1 and D-DAY, and on day-count milestones โ all scheduled on your phone. A small card in the app on milestone days. โข Share a D-Day as a card, with a link that opens it in a friend's Onseol, ready to add. โข Back up your D-Days and their photos to a file you keep, and restore them on a new phone. ONSEOL PRO โ one purchase, forever. Not a subscription. โข Unlimited D-Days and all 16 colors โข Your photo on any D-Day โ on its card, and in the Photo widget (iOS 17 or later) โข Three more widget designs: Ring, Photo and Minimal (iOS 17 or later) โข Count it your way โ in years, months and days, in weeks, or in hours โข Every milestone with its date, from day 100 to day 10,000 โข Ink and Photo share cards Free: five D-Days, the classic widget in every size, reminders, lunar dates, milestone cards, the Paper share card and backup. Onseol Pro supports Family Sharing.
Screenshots
Verdict
The clearest difference is in-app purchases: D at none against Onseol's 1. D also leads on update cadence (every 3 days vs every 3 weeks) and iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Onseol sells 1 one-off in-app purchase. D asks for nothing beyond the download.
D ships an update every 3 days, Onseol every 3 weeks. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.
| Parameter | D | Onseol |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days โ better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPad, iPod โ better | iPhone, iPod |
| Requires iOS | 13.0 โ better | 15.0 |
| Further details โ not scored | ||
| Size | 33 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | HeungYeol Kim | Mustafa Salim Erek |
In-app purchases
D
No in-app purchases
Onseol
- Onseol Pro$9.99









