Comparison

MarkDays vs When · Days That Matter

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

Head to head
About

MarkDays

This tool helps you remember and count down to significant life events like anniversaries, birthdays, and important schedules. Receive timely reminders so you never miss a special occasion. Track both past and future important dates.

Highlights
  • Mark important life days
  • Count down to events
  • Track past events
  • Timely reminders
  • Anniversary tracking
  • Birthday reminders
Features
Read full description

Markdays is a small, focused tool for remembering the days that matter. Mark a birthday, an anniversary, an exam, a first meeting, or any date you do not want to lose. When the day comes, a timely reminder helps you notice it—not after it has already passed. For example: How many days until a birthday? How many days until the exam? How many days until the next wedding anniversary? How many days has the baby been in the world? How many days have we known each other? Every important day is worth keeping. DAYS REMAINING AND DAYS PASSED See how many days remain until the next marked day, or how many days have already passed. The list is sorted by closeness, so today, upcoming, and past events are easy to tell apart. GREGORIAN AND LUNAR CALENDARS Create an event on the Gregorian calendar or the Chinese lunar calendar. Lunar birthdays and traditional festivals can repeat on the calendar you actually use. In non-Chinese languages you can also choose a second calendar, such as Buddhist, Islamic, Hebrew, or Japanese. REPEAT AND ALERTS Repeat never, daily, weekly, monthly, or yearly. Alerts can fire at the event time, or 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 1 day, 2 days, or 1 week before. Add a second alert, and snooze for 10 minutes, 30 minutes, or 1 hour. COLOR AND ORDER Give each day a color so the important, the gentle, and the urgent are easy to spot. HOME SCREEN WIDGETS Small, medium, and large widgets can show the nearest event, the next upcoming event, the newest event, or one event you choose. Pin a favorite day to the widget and see the countdown whenever you glance at the Home Screen. APPLE WATCH Check your marked days, remaining or elapsed days, and dates from your wrist. ICLOUD SYNC The main app stores your events with iCloud, so they stay in sync across your devices. Widgets read the same shared data. Change phones or use more than one device—the days you marked are still there. TIME ZONE Follow the system time zone, or pick one yourself, so the day count stays accurate when you travel. The trial version can create 5 events. Upgrade to Professional to add more. We would love for you to try Markdays, and we welcome your feedback. Your support is what keeps us improving.

About

When · Days That Matter

Features
Read full description

When (formerly #DAYS) helps you keep the dates that shape your past, present, and future. Birthdays, anniversaries, and the days a plan begins or ends can all live on one continuous timeline. ONE STORY, MORE THAN ONE DATE Add beginnings, endings, and other moments to the same record, so its full arc stays together—not just a countdown number. SEE TIME CLEARLY Browse what has passed, what is in progress, and what is coming next. When uses each actual date and keeps the exact day count visible. HOME SCREEN WIDGETS Keep important dates and photos on your Home Screen. Each widget size can have its own event and composition. GENTLE, USEFUL REMINDERS Set custom and milestone reminders. Notifications are scheduled locally on your device, with no account required. FREE & PREMIUM Create up to 10 records for free, with iCloud sync and timelines included. Premium unlocks unlimited records, advanced reminders, poster widget layouts, and celebration effects. A one-time purchase unlocks Premium permanently. Your records are designed with privacy in mind. If you enable iCloud, sync is provided by Apple CloudKit. Purchases are handled by Apple’s StoreKit. Questions or feedback? Email aloooone@proton.me Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

MarkDays3 screens
When · Days That Matter4 screens

Verdict

The call

The clearest difference is update cadence: When · Days That Matter at every 2 weeks against MarkDays's every 70 months. MarkDays's advantage is device support (4 vs 1). On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. MarkDays sells 1 one-off in-app purchase and When · Days That Matter sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

MarkDays ships an update every 70 months, When · Days That Matter every 2 weeks. Both last shipped on November 3, 2026.

Scorecard2 real differences · 8 level
MarkDays versus When · Days That Matter: the parameters behind the verdict, then further details
ParameterMarkDaysWhen · Days That Matter
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings1 — better—
Update frequencyEvery 70 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Mac, Apple Watch — betteriPhone
Requires iOS16.0 — better17.0
Further details — not scored
Size8 MB6 MB
Age rating4+4+
Developer昊罡 姚杰龙 刘

In-app purchases

1 purchases

MarkDays

One-time1
  • Unlock MarkedDays Professional$4.99
1 purchases

When · Days That Matter

One-time1
  • When Premium · Lifetime Access$0.99

Questions

Is MarkDays free?
MarkDays is free to download, with in-app purchases available.
Is When · Days That Matter free?
When · Days That Matter is free to download, with in-app purchases available.
Do MarkDays or When · Days That Matter have ads?
Neither MarkDays nor When · Days That Matter shows ads.
Which is updated more often, MarkDays or When · Days That Matter?
MarkDays ships an update every 70 months, and When · Days That Matter every 2 weeks. Most recently, MarkDays was updated on November 3, 2026 and When · Days That Matter on November 3, 2026.

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