Comparison

D vs BySide

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

Head to head
About

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.

Highlights
  • 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
Read full description

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

About

BySide

Features
Read full description

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

D4 screens
BySide4 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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.

UpkeepUpdate frequency

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.

Scorecard1 real difference Β· 7 level
D versus BySide: the parameters behind the verdict, then further details
ParameterDBySide
PriceFreeFree
Positive reviews100.0% of reviewsβ€”
Update frequencyEvery 4 daysEvery 2 days β€” better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesβ€”
DevicesiPhone, iPad, iPod β€” betteriPhone, iPad
Requires iOS15.0 β€” better16.4
Further details β€” not scored
Size52 MB55 MB
Age rating4+4+
DeveloperCodeSand Co. Ltd.Naegyeotui

In-app purchases

3 purchases

D

One-time3
  • A Coffee$2.99
  • Remove Ads$3.49
  • A Slice of Cake$5.99
1 purchases

BySide

One-time1
  • κ΄‘κ³  제거 / Remove Ads$3.99

Questions

Is D free?
D is free to download, with in-app purchases available.
Is BySide free?
BySide is free to download, with in-app purchases available.
Do D or BySide have ads?
Both D and BySide show ads.
Which is updated more often, D or BySide?
D ships an update every 4 days, and BySide every 2 days. Most recently, D was updated on October 29, 2026 and BySide on October 31, 2026.

Other comparisons