D vs Datto
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
D
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D-Day Keep — a beautiful countdown widget for every day that matters. Anniversaries, birthdays, exams, trips — keep every important date at your fingertips. # Key features • D-Day countdown — register any date, past or future. Days are calculated automatically every day. • Home screen widget — see your D-Days at a glance, no need to open the app. • Photo backgrounds — place a memory on your D-Day card. • 8 themes — Coral, Ocean, Forest, Sunset, Gold, Midnight, Blossom, Ivory. • Milestone alerts — D-100, 1-year, the day itself, and more. • Cloud backup (optional) — sign in to keep your D-Days across devices. • 13 languages — Korean, English, Japanese, Chinese, Spanish, Portuguese, Indonesian, Vietnamese, Arabic, Russian, French, German, Italian. • Minimal ads — light and unobtrusive. # Perfect for • Couples tracking 100-day & anniversary milestones • Family birthdays and wedding anniversaries • Exam prep — college entrance, certification, professional tests • Trips, concerts, military discharge, big events • Diet, quit-smoking, workout — track when you started • Keeping memories of someone special, with a photo # Why D-Day Keep? • Start instantly — no sign-up required • Sign in is optional — Google, Apple, or Kakao for cloud backup • Beautiful cards with photos & themes — every day feels like a memory • Home widget — your D-Days stay visible every day • Localized for 13 languages — naturally, not auto-translated # Privacy-first If you don't sign in, your D-Days never leave your phone. Cloud backup only applies after sign-in, and you can delete your account at any time to permanently erase all data. • Privacy policy: https://codesand.co.kr/app/dkeep/privacy • Terms of service: https://codesand.co.kr/app/dkeep/terms • Support: support@codesand.co.kr
Datto
This app displays the number of days remaining until important dates directly on your Home Screen via a widget. It offers customizable colors and themes to match your device. Additional features like unlimited events and milestone reminders are available with a one-time purchase.
- Home screen countdown widget
- Customizable colors and themes
- Unlimited events (Pro)
- Repeating events (Pro)
- Milestone reminders (Pro)
- iCloud sync (Pro)
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You don't have to open it to see how many days are left. Datto is a quiet countdown that puts the days until your important dates right on your Home Screen. There is no habit to keep. Put it there once, and every glance tells you how long is left. An exam, a deadline, a birthday, a trip, a move — you add the day only once. ■ What it does (free) ・Counts down the days to the dates you care about (up to three) ・Shows one of them in a Home Screen widget (small) ・12 curated colors, plus any custom color you like ・Text color adjusts automatically to stay readable ・A dark appearance — match your device, or keep it light or dark ■ Datto Pro (a one-time purchase, not a subscription) ・As many widgets as you like — Medium, Large and the Lock Screen too ・Unlimited events ・Repeating events (yearly or monthly, rolling over on their own) ・Milestone reminders (100 days, the day before, the day itself — always silent) ・Hours and minutes as the day gets close ・Categories to keep work, family and trips apart ・iCloud sync — the same days on every device signed in to the same Apple Account ■ Made for you if ・You want to keep a goal in view ・You would rather be watched over quietly than nagged ・You like a Home Screen that looks like yours No account, no ads. What you enter stays on your device. With iCloud sync on, it lives only in your own iCloud. To improve the app, only anonymous usage (such as which screens were opened) is sent. Never your event names, and never your name, email, or advertising ID. You can turn it off in Settings. Simply, the days until yours.
Screenshots
Verdict
The clearest difference is in-app purchases: D at none against Datto's 1. D also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). Datto's advantage is ads (none vs shown). On price and update cadence 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. Datto sells 1 one-off in-app purchase. D asks for nothing beyond the download.
D ships an update every 3 days, Datto every 2 days. The most recent releases landed on September 21, 2026 and September 30, 2026 respectively.
| Parameter | D | Datto |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 days | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 52 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | CodeSand Co. Ltd. | Minari Taniguchi |
In-app purchases
D
No in-app purchases
Datto
- Datto Pro$3.99









