Countdown GO vs Onseol
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Add multiple activities
- Personalize with pictures
- iPad photo frame mode
- iCloud device sharing
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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.
Onseol
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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
Verdict
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
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.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.
| Parameter | Countdown GO | Onseol |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (16 ratings) — better | — |
| Positive reviews | 40.0% of reviews | — |
| Number of ratings | 16 — better | — |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Mac, Apple TV, Apple Watch — better | iPhone, iPod |
| Requires iOS | 27.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Jeroen Zonneveld | Mustafa Salim Erek |
In-app purchases
Countdown GO
- Premium$0.99
Onseol
- Onseol Pro$9.99









