CozyDay vs 삐디
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CozyDay
This app helps couples track their relationship milestones, from the first date to anniversaries. It offers a D-Day counter, a shared calendar, love letters, and widgets to keep memories alive and celebrate special days together.
- D-Day counter
- Anniversary management
- Home and lock screen widgets
- Memory photo attachments
- 24-hour disappearing love letters
- Couple profile creation
- Customizable notification settings
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Track every day of your love story -- from the first date to forever. D-Day counter, 24-hour love letters, couple calendar, anniversary alerts, and home/lock screen widgets -- everything couples need, all in one beautifully designed app. An adorable pixel art dog character joins you on your special days. --- Key Features --- [D-Day Counter] See how many days you've been together at a glance, from the day you met until today. Every time you open the app, a count-up animation brings a flutter of excitement. [Anniversary Management] 100 days, 200 days, 1 year... Automatically generated anniversaries, plus the ability to add your own special dates. Never miss Valentine's Day, Christmas, and other suggested anniversaries. [Check Daily with Widgets] Check your D-Day anytime with home screen and lock screen widgets. Automatically updated at midnight so the date is always accurate. [Save Memories with Photos] Attach photos to each anniversary and record your precious memories. Look back on your story together in a timeline view. [24-Hour Letter] Send one special letter a day that disappears at the next midnight. Invite your partner with an invite code and view your exchanged letters in a chat bubble format. You'll receive a push notification when a new letter arrives, and a reminder 3 hours before it expires. [Couple Profile] Create your own couple profile with both of your names and photos. [Notification Settings] 1 day before, 3 days before, 1 week before an anniversary - receive notifications at your preferred time and prepare for your special days in advance. [Multi-Language Support] Available in 39 languages so anyone around the world can use it.
삐디
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소중한 사람의 특별한 날, 이제 절대 잊지 마세요. BiDi는 다양한 기념일을 스마트하게 관리해주는 기념일 알림 앱이에요. 등록만 해두면 D-day를 매일 확인하고, 날짜가 다가오면 미리 알림을 보내드려요. [ 주요 기능 ] * 기념일·생일 관리 생일, 결혼기념일, 커플기념일, 반려동물, 추모일 등 모든 특별한 날을 한곳에서 관리하세요. * 음력 완벽 지원 음력으로 기억하는 부모님 생신, 제삿날도 정확하게 양력으로 변환해 알려드려요. * D-day 카운트다운 다가오는 기념일을 D-day로 한눈에 확인하고, 달력 뷰로 한 달의 일정을 파악하세요. * 스마트 알림 D-30부터 당일까지, 세심한 알림으로 절대 잊지 않게 도와드려요. * 메모 기능 기념일마다 선물 아이디어, 준비할 일 등을 메모로 남겨두세요. * 다크모드 지원 라이트/다크/시스템 설정에 맞춰 편안하게 사용하세요. [ 이런 분께 추천해요 ] - 매번 기념일을 까먹어서 혼나는 분 - 부모님, 연인, 친구의 생일을 한번에 관리하고 싶은 분 - 음력 생일을 양력으로 변환하기 번거로운 분 - 소중한 사람에게 먼저 챙겨주고 싶은 분 지금 바로 등록하고, 다음 기념일을 완벽하게 준비해보세요!
Screenshots
Verdict
The clearest difference is ads: 삐디 at none against CozyDay's shown. 삐디 also leads on iOS requirement (15.1 vs 18.0). CozyDay's advantage is update cadence (every 2 days vs every 2 weeks). On price, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.
CozyDay ships an update every 2 days, 삐디 every 2 weeks. Both last shipped on October 31, 2026.
| Parameter | CozyDay | 삐디 |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 2 days — better | Every 2 weeks |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 31 MB | 21 MB |
| Age rating | +4 | 4+ |
| Developer | MyeongJin Lee | Woojung Jeon |
In-app purchases
CozyDay
No in-app purchases
삐디
No in-app purchases









