Comparison

K vs Days Until

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

Head to head
About

K

Features
Read full description

K-Card Reader is a focused Korean transit card balance checker for iPhone. Tap a supported physical KS X 6924 card with NFC to read practical details such as card family, card number, stored balance, issue date, valid-through date, recent trips, and local transaction history where the card exposes it. It is built for travelers, residents, and anyone who wants a quick way to check T-money, EZL/Cashbee, Climate Card, NAMANE, MOIBA, or K-Cash without hunting through station machines. Saved cards stay on your iPhone for fast review. Pro Mode is an optional $2/year subscription that removes ads, unlocks the hex parsing view, and backs up saved cards plus custom card-face images with your iCloud account. This is an unofficial utility and is not affiliated with transport operators, card issuers, or payment networks. It cannot top up cards, issue tickets, validate fares, or modify card data. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Days Until

Features
Read full description

Days Until app lets you see at a glance how much time is left until an important event, or how much time has passed since one. Track birthdays, anniversaries, exam dates, due dates, and more. [Countdown / Count-up Display] · Remaining or elapsed time updates automatically in real time · Choose exactly which units to show: years, months, weeks, days, hours, minutes, seconds · Fractional amounts round up; all-day events show a clear "Today" label on the day itself [Customize Your Background] · Choose photos from your library, built-in illustrations, patterns, or solid colors · Generate images with Apple Intelligence on supported devices · Freely set text color, size, weight, and position — drag it anywhere on screen [Three Sections at a Glance] · Events are automatically sorted into "Upcoming," "Today," and "Since" · They move between sections automatically as time passes, and you can flip the sort order anytime [Repeating Events] · Supports daily, weekly, monthly, and yearly repeats · Automatically advances to the next date once an event has passed [Import from Calendar] · Pick events straight from the calendars on your device · Browse events from multiple calendars at once with "All Calendars" [Share & Widgets] · Create a shareable image combining your background, title, and remaining time · Check events without opening the app using Home Screen widgets (Small/Medium/Large/Extra Large) · Choose a different event for each widget [Apple Watch Support] · Check your event list and countdown screen right on your Apple Watch · See remaining time at a glance with watch face complications [iCloud Sync] · Keep your events in sync across devices (optional, off by default) Available in Japanese and English. Requires iOS 18 or later. Works on iPhone, iPad, and Apple Watch.

Screenshots

K3 screens
Days Until3 screens

Verdict

The call

The clearest difference is in-app purchases: Days Until at none against K's 1. Days Until also leads on update cadence (daily vs weekly) and device support (3 vs 1). K's advantage is ads (none vs shown) and iOS requirement (16.0 vs 18.0). On price 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. K sells 1 in-app purchase, starting at $1.99 per year. Days Until asks for nothing beyond the download.

UpkeepUpdate frequency

K ships an update weekly, Days Until daily. The most recent releases landed on September 23, 2026 and September 13, 2026 respectively.

Scorecard5 real differences · 1 level
K versus Days Until: the parameters behind the verdict, then further details
ParameterKDays Until
PriceFreeFree
Update frequencyWeeklyDaily — better
AdsNo — betterYes
In-app purchasesYesNo — better
DevicesiPhoneiPhone, iPad, Apple Watch — better
Requires iOS16.0 — better18.0
Further details — not scored
Size19 MB31 MB
Age rating4+4+
DeveloperKitta Co.Legal Prompt Inc.

In-app purchases

1 purchases

K

Subscriptions1
  • Pro Mode$1.991 Year
None

Days Until

No in-app purchases

Questions

Is K free?
K is free to download, with in-app purchases available.
Is Days Until free?
Days Until is free to download, with no in-app purchases.
Do K or Days Until have ads?
Days Until shows ads; K does not.
Which is updated more often, K or Days Until?
K ships an update weekly, and Days Until daily. Most recently, K was updated on September 23, 2026 and Days Until on September 13, 2026.

Other comparisons