99캘린더 vs Piece Day
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
99캘린더
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99Calendar is a schedule management app that brings together your timetable, daily timeline, and calendar in one place. Organize repeating weekly schedules in a timetable view, follow your day in a timeline view, and check date-based plans in the calendar. You can turn schedule sets on or off to focus only on what you need, and view timetable items together with calendar events. Features Weekly timetable-based schedule management Daily timeline view Turn schedule sets on or off View timetable items and calendar events together Import and export support Theme options Counter features for routine tracking 99Calendar is designed to help you manage everyday schedules in a simple and lightweight way. Some counter features are optional personal logging tools. Health or cycle-related information is for personal reference only and is not intended for medical diagnosis, treatment, or guidance.
Piece Day
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Piece Day — a habit tracker that keeps your day in gentle little pieces We took the paper habit trackers from stationery-shop diaries and put them on your iPhone, unchanged. No sign-up, no elaborate setup. One tap marks today. ■ Four trackers, one app · Monthly — fill the calendar with green checks and see a whole month at a glance · Weekly — plan this week's goals day by day, Monday through Sunday · Time Table — colour in your day on a 24-hour dial · Bucket List — tick off the things you want to do someday, one circle at a time ■ Made for you if · You want to get past day three and build something that lasts · You love the feel of paper diaries and planners · You've been looking for a tracker with nothing extra in it ■ Private by design · No login, no server — everything stays on your iPhone · No ads, no tracking A pink dinosaur and a little black cat are here to keep you company. Take today one piece at a time.
Screenshots
Verdict
The clearest difference is price: Piece Day at Free against 99캘린더's $1.99. 99캘린더's advantage is update cadence (every 4 days vs every 11 days). On ads, in-app purchases, device support and iOS requirement 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
Piece Day is free to download; 99캘린더 costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
99캘린더 ships an update every 4 days, Piece Day every 11 days. The most recent releases landed on October 25, 2026 and October 8, 2026 respectively.
| Parameter | 99캘린더 | Piece Day |
|---|---|---|
| Price | $1.99 | Free — better |
| Positive reviews | — | 100.0% of reviews |
| Update frequency | Every 4 days — better | Every 11 days |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 5 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | HWAN LEE | Warm Tech Company |
In-app purchases
99캘린더
No in-app purchases
Piece Day
No in-app purchases









