D vs BySide
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
D
Easily track important dates like anniversaries, birthdays, and trips with a customizable home screen widget. Add photos and choose from various themes to personalize your countdowns. Optional cloud backup ensures your memories are safe across devices.
- D-Day countdown for past/future dates
- Home screen widget for at-a-glance viewing
- Customizable photo backgrounds
- Multiple theme options
- Milestone alerts
- Optional cloud backup
- Support for 20 languages
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D-Day Keep β a beautiful countdown widget for every day that matters. Anniversaries, birthdays, exams, trips β keep every important date at your fingertips. # Key features β’ D-Day countdown β register any date, past or future. Days are calculated automatically every day. β’ Home screen widget β see your D-Days at a glance, no need to open the app. β’ Photo backgrounds β place a memory on your D-Day card. β’ 8 themes β Coral, Ocean, Forest, Sunset, Gold, Midnight, Blossom, Ivory. β’ Milestone alerts β D-100, 1-year, the day itself, and more. β’ Cloud backup (optional) β sign in to keep your D-Days across devices. β’ 20 languages β Korean, English, Japanese, Chinese, Spanish and more. β’ Minimal ads β light and unobtrusive. # Perfect for β’ Couples tracking 100-day & anniversary milestones β’ Family birthdays and wedding anniversaries β’ Exam prep β college entrance, certification, professional tests β’ Trips, concerts, military discharge, big events β’ Diet, quit-smoking, workout β track when you started β’ Keeping memories of someone special, with a photo # Why D-Day Keep? β’ Start instantly β no sign-up required β’ Sign in is optional β Google, Apple, or Kakao for cloud backup β’ Beautiful cards with photos & themes β every day feels like a memory β’ Home widget β your D-Days stay visible every day β’ Localized for 20 languages β 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. β’ Privacy policy: https://codesand.co.kr/app/dkeep/privacy β’ Terms of service: https://codesand.co.kr/app/dkeep/terms β’ Support: dkeep@reply.codesand.co.kr
BySide
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Keep the days that matter by your side. The day you met, Mom's birthday, your wedding anniversary, an exam or a trip. BySide counts down to β or up from β the days that matter, and reminds you before they arrive. β Timeline and calendar β’ See upcoming days grouped by this week, this month and each month, with a badge on 100-day milestones. β’ Jump to any month or year in the Calendar tab, and tap a date to start a new D-Day. β’ Holidays from your device calendar appear in the calendar and widgets. β A D-Day album decorated with your photos β’ Add a photo to each D-Day and browse them as photo tiles, like an album. β’ Crop and rotate each photo to fit just right. β’ Choose from four views β list, cards, album or calendar. Your last view is remembered. β A reminder every 100 days β’ Count your days together with D+, and 100, 200 and 1,000-day milestones are calculated for you. β’ Get reminded on the day, and 1, 3 or 7 days before. β’ Set a different reminder time for each D-Day. β Repeats on its own β’ Birthdays and anniversaries repeat yearly; paydays and card bills repeat monthly. β Your first D-Day, together β’ When you first open the app, just pick what kind of day it is. Relationship, birthday, or exam & deadline β the settings are filled in to match. β Home screen widgets β’ One D-Day shown big with its photo, several D-Days in a list, or this month's calendar. β’ Style the widgets to match your wallpaper. β’ Show the days left for a chosen D-Day as a badge on the app icon. β Share as photo cards β’ Make a card with a photo background and send it to friends in your favorite messaging or social apps. β’ Save the card image straight to your photo library. β Neat and tidy β’ Create your own categories like Couple, Family or Work, with colors and emoji β’ Sort by nearest, manually, recently added or by name, and pin to top β’ D-Days you won't need afterward, like exams and deadlines, can be cleared automatically the next day β’ Memos, search, month/year view and dark mode β Use with peace of mind β’ Start right away, no sign-up β’ Your D-Days and photos are stored only on your iPhone β’ Backup files include your photos, so everything comes with you to a new phone β Remove ads with a one-time purchase β’ Removes all ads in the app. β’ Not a subscription β no recurring charges. All features are free; the free version shows ads. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy: https://boksday.github.io/dday/privacy/ Contact: ekqlszzzz@naver.com
Screenshots
Verdict
The clearest difference is update cadence: BySide at every 2 days against D's every 4 days. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. D sells 3 one-off in-app purchases and BySide sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
D ships an update every 4 days, BySide every 2 days. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.
| Parameter | D | BySide |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | β |
| Update frequency | Every 4 days | Every 2 days β better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | β |
| Devices | iPhone, iPad, iPod β better | iPhone, iPad |
| Requires iOS | 15.0 β better | 16.4 |
| Further details β not scored | ||
| Size | 52 MB | 55 MB |
| Age rating | 4+ | 4+ |
| Developer | CodeSand Co. Ltd. | Naegyeotui |
In-app purchases
D
- A Coffee$2.99
- Remove Ads$3.49
- A Slice of Cake$5.99
BySide
- κ΄κ³ μ κ±° / Remove Ads$3.99









