Comparison

D vs Big Day

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

Head to head
About

D

Easily set and track important dates, such as D-Day. This utility app helps you monitor the remaining time until your specified events.

Highlights
  • Set D-Day
  • Check remaining time
  • Event tracking
  • Simple interface
Features
Read full description

Set D-Day and check remain.

About

Big Day

Features
Read full description

Count down to what matters. See it on your Home Screen, Lock Screen, and Apple Watch. Countdown turns any date into a live countdown you can actually see — no opening an app, no digging through a calendar. Your next trip, your wedding, your exam, your due date. Always one glance away. FREE, AND ACTUALLY FREE No ads. Not on the free tier, not ever. No banners, no video walls, no "watch this to unlock." WIDGETS THAT DO MORE • Home Screen widgets in every size — small, medium, large, and inline • Lock Screen widgets so you see it without unlocking • Live Activities — watch the final hours tick down in real time on your Lock Screen and Dynamic Island • Interactive widgets — mark events done or snooze right from the Home Screen • Apple Watch complication showing your next event COUNT DOWN — OR COUNT UP Days until your holiday. Or days since you quit smoking, since the baby arrived, since you started. Both directions, same app. BUILT FOR REAL LIFE • Recurring events that reset themselves — birthdays, anniversaries, rent, monthly deadlines • Weekday-only counting for work deadlines (17 working days, not 24 calendar days) • Multiple alerts per event — a week out, a day out, an hour out • Categories with colors and icons — travel, family, work, health • Custom photo backgrounds from your library or our gallery • Choose exactly what shows: years, months, weeks, days, hours, minutes, seconds • Share a countdown to iMessage in one tap YOUR APPLE WATCH, INCLUDED Your countdowns sync to your Watch automatically — no iCloud account needed, no subscription, on the free tier. COUNTDOWN PRO — ONE PAYMENT, NOT A SUBSCRIPTION Unlimited events, iCloud sync between iPhone and iPad, unlimited custom backgrounds, and all widget styles. Pay once. Keep it forever. Free tier includes 5 events, all widget sizes, Apple Watch sync, and zero ads. PRIVATE BY DESIGN Your events stay on your device and in your own iCloud. No accounts, no servers, no tracking. EULA: Apple’s Standard License Agreement applies.

Screenshots

D4 screens
Big Day4 screens

Verdict

The call

The clearest difference is in-app purchases: D at none against Big Day's 1. Big Day's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Big Day sells 1 one-off in-app purchase. D asks for nothing beyond the download.

UpkeepUpdate frequency

D ships an update every 3 months, Big Day every 2 weeks. The most recent releases landed on September 23, 2026 and September 21, 2026 respectively.

Scorecard2 real differences · 7 level
D versus Big Day: the parameters behind the verdict, then further details
ParameterDBig Day
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, Apple Watch
Requires iOS17.017.0
Further details — not scored
Size7 MB5 MB
Age rating4+4+
DeveloperSi-Wan YoonDamien Asseya

In-app purchases

None

D

No in-app purchases

1 purchases

Big Day

One-time1
  • Countdown Pro$5.99

Questions

Is D free?
D is free to download, with no in-app purchases.
Is Big Day free?
Big Day is free to download, with in-app purchases available.
Do D or Big Day have ads?
Neither D nor Big Day shows ads.
Which is updated more often, D or Big Day?
D ships an update every 3 months, and Big Day every 2 weeks. Most recently, D was updated on September 23, 2026 and Big Day on September 21, 2026.

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