Comparison

D vs Onseol

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

D

Easily track important dates and countdown to significant events. This app helps you remember anniversaries, birthdays, and other milestones by calculating the remaining days. Never forget a special occasion again with this simple countdown tool.

Highlights
  • Countdown to special dates
  • Anniversary tracking
  • Birthday reminders
  • Event countdowns
  • Simple interface
Features
Read full description

D-Day Counter Do you want to remember your anniversary is 100 days? Was this a few days you met your boyfriend? How much is left of your birthday? How many days are left for your anniversary? Met your lover and D + 200 Olympic D-100 Remember a couple apps anniversary of D-Day. Try App D-Day application.

About

Onseol

Features
Read full description

Onseol counts the days that matter — no account, no sign-up, no ads. Your D-Days live on your phone. Onseol has no server and keeps no copy. • Korean-style D-Days — D-100, D-7, D-DAY, and days-since counted from day 1. 100-day and yearly milestones, automatically. • Lunar (음력) birthdays & memorials — Onseol finds the solar date for you each year. • Home & Lock Screen widgets (iOS 16 or later) — automatic, or one D-Day of your choice per widget (iOS 17 or later). • Reminders at D-7, D-1 and D-DAY, and on day-count milestones — all scheduled on your phone. A small card in the app on milestone days. • Share a D-Day as a card, with a link that opens it in a friend's Onseol, ready to add. • Back up your D-Days and their photos to a file you keep, and restore them on a new phone. ONSEOL PRO — one purchase, forever. Not a subscription. • Unlimited D-Days and all 16 colors • Your photo on any D-Day — on its card, and in the Photo widget (iOS 17 or later) • Three more widget designs: Ring, Photo and Minimal (iOS 17 or later) • Count it your way — in years, months and days, in weeks, or in hours • Every milestone with its date, from day 100 to day 10,000 • 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

D2 screens
Onseol3 screens

Verdict

The call

The clearest difference is in-app purchases: D at none against Onseol's 1. Onseol's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 3 months). On price, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Onseol sells 1 one-off in-app purchase. D asks for nothing beyond the download.

UpkeepUpdate frequency

D ships an update every 3 months, Onseol every 3 weeks. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 7 level
D versus Onseol: the parameters behind the verdict, then further details
ParameterDOnseol
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews60.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supported—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.015.0
Further details — not scored
Size6 MB28 MB
Age rating4+4+
DeveloperEONSOFTMustafa Salim Erek

In-app purchases

None

D

No in-app purchases

1 purchases

Onseol

One-time1
  • Onseol Pro$9.99

Questions

Is D free?
D is free to download, with no in-app purchases.
Is Onseol free?
Onseol is free to download, with in-app purchases available.
Do D or Onseol have ads?
D shows ads; Onseol does not.
Which is updated more often, D or Onseol?
D ships an update every 3 months, and Onseol every 3 weeks. Most recently, D was updated on November 1, 2026 and Onseol on October 24, 2026.

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