Comparison

Countdown GO vs Onseol

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

Head to head
About

Countdown GO

Track upcoming events and activities with personalized visuals. Share your countdowns across Apple devices via iCloud. Use your iPad as a dynamic photo frame for your events.

Highlights
  • Add multiple activities
  • Personalize with pictures
  • iPad photo frame mode
  • iCloud device sharing
Features
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A fresh, modern look and a handy new feature! • Event history — Look back at all the events that have already passed, right from Settings. • Redesigned add screen — Creating an event is now a live preview: pick your photo and instantly see how your countdown will look. • Refreshed Premium & Privacy screens — Cleaner, clearer, and easier on the eyes. • Fixed a date bug — Events set for tomorrow no longer show up as "Today". • Various visual polish and small improvements.

About

Onseol

Features
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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

Countdown GO3 screens
Onseol3 screens

Verdict

The call

The clearest difference is device support: Countdown GO at 5 against Onseol's 2. Onseol's advantage is iOS requirement (15.0 vs 27.0). On price, update cadence, ads and in-app purchases 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. Countdown GO sells 1 one-off in-app purchase and Onseol sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
Countdown GO versus Onseol: the parameters behind the verdict, then further details
ParameterCountdown GOOnseol
PriceFreeFree
Rating3.0 (16 ratings) — better—
Positive reviews40.0% of reviews—
Number of ratings16 — better—
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Mac, Apple TV, Apple Watch — betteriPhone, iPod
Requires iOS27.015.0 — better
Further details — not scored
Size10 MB28 MB
Age rating4+4+
DeveloperJeroen ZonneveldMustafa Salim Erek

In-app purchases

1 purchases

Countdown GO

One-time1
  • Premium$0.99
1 purchases

Onseol

One-time1
  • Onseol Pro$9.99

Questions

Is Countdown GO free?
Countdown GO is free to download, with in-app purchases available.
Is Onseol free?
Onseol is free to download, with in-app purchases available.
Do Countdown GO or Onseol have ads?
Neither Countdown GO nor Onseol shows ads.
Which is updated more often, Countdown GO or Onseol?
Countdown GO ships an update every 3 weeks, and Onseol every 3 weeks. Most recently, Countdown GO was updated on November 2, 2026 and Onseol on October 31, 2026.

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