CalCs vs DeferDeck
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CalCs
Enhance your Apple Watch experience with customizable calendar complications. Display dates, events, reminders, and monthly calendars directly on your watch face. Manage your schedule at a glance without needing to open the main app.
- Date display complications
- Event and reminder display
- Monthly calendar view
- Customizable week start day
- Holiday support
- Minimal settings
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CalCs (short for "Calendar Complications") is a watchOS-only app that provides various complications related to the calendar. --Important Notes-- The features built into the main body of this app are limited to listing events/reminders & displaying a monthly calendar. All other features are provided through complications & the Smart Stack. ●If you download CalCs from the iPhone App Store, due to synchronization issues between the iPhone & Apple Watch, CalCs may not appear on the Apple Watch. According to Apple's specifications, watchOS-only apps cannot be re-downloaded from the App Store app on the iPhone. Therefore, please use the App Store app "on your Apple Watch" & follow the steps below to re-download it. ・Scroll to the bottom→"Account"→"Purchased"→"CalCs"→re-download ------------------- Key Features ●Supports a variety of complications such as date display, events/reminders display, & monthly calendar display ・Date Display Displays the current date in various formats. ・Event/Reminder Display Displays events/reminders synced with your iPhone. You can choose whether or not to include all-day events. ・Monthly Calendar Display Displays the monthly calendar in various formats. You can choose to start the week on Monday. Supports holidays in some areas. *Holiday data depends on external APIs & may be incomplete. Only Modular Duo supporting models (Series 7+, not SE series) can show a month calendar using 2 large rectangles. Other models can show it in 1, with smaller font. ●In the main app, events/reminders, & the monthly calendar are displayed Tapping the complication opens the app, where you can view the list of events/reminders synced with your iPhone, as well as the monthly calendar. *Only incomplete reminders are displayed. *The app currently does not have functionality to add, edit, or delete events/reminders, nor to mark reminders as complete. ●Minimal Setting Options To avoid complicating settings on the small Apple Watch screen, the settings only allow you to select which calendar/reminder lists to display. *Notes ・The corner complications, circular complications, & large rectangular complications are supported only on Apple Watch Series 4 & later, so CalCs is not guaranteed to work on Series 3 or earlier models. ・Due to the limitations of watchOS complication display updates, complications may not immediately reflect changes when the date changes or after events or reminders are added or edited on the iPhone. ・After placing a complication for the 1st time, it may take some time for it to actually appear. ・If the complication is not updating, try tapping the complication to open CalCs, as this may refresh the data. ・If the complication is not updated even after launching CalCs, the issue may be resolved by 1 of the following methods. Please try them. 1.Restart both your iPhone & Apple Watch. 2.Force restart CalCs ①With CalCs open, press & hold the side button. ②When the screen for emergency call & power off appears, press & hold the Digital Crown. 3.Reinstall CalCs ①Press the Digital Crown to display the app list. ②Press & hold CalCs, then tap the × button to delete it when it appears. ③Launch the App Store app on your Apple Watch. ④Scroll to the bottom→"Account"→"Purchased"→"CalCs"→Re-download. ・If the complication does not update after force quitting & restarting CalCs, try restarting both your iPhone & Apple Watch, as it may resolve the issue. ・If event information is not displayed on the app's main event/reminder list screen or in complications, it may be because full access to the calendar has not been granted. The issue may be resolved by following the steps below to re-enable full access permission to the calendar. Please give it a try. ①Open the "Privacy & Security" section in the iPhone Settings app & tap "Calendars". ②Change CalCs' calendar access to "None", then select "Add Events Only". ③When you open CalCs, you will be prompted to grant full access, so tap "Allow Full Access".
DeferDeck
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Organizing your photos has never been easier. DeferDeck lays out your Photo Library albums in clean, date-by-date sections—your "deck"—so you can organize, browse, and even defer photos to the future, all in one simple place. **What you can do** Clear out screenshots in bulk Select all those piled-up screenshots at once and delete them in a tap. Align several photos to the same date or move them into other albums together—no more one-by-one. Got a photo to send a friend? Share & Delete shares it and tidies up in a single step. Turn images into reminders A sale flyer, a school-event pamphlet, a concert announcement—just set a photo's date to the day it matters, and it'll quietly catch your eye every time you open Photos. Anything you'd rather handle later? Defer it to tomorrow, next Saturday, next month, a specific time of day, or even a random future date. Deferred by mistake? Undo it right after, straight from the toast. Build daily routines Add a photo to Routine and its date rolls forward to today automatically, every day—perfect for a medication note, a stretching routine, or anything you want in front of you daily. Check or remove routine photos anytime from Quick Access. Copy text from screenshots A Wi-Fi password, an order number, a URL—copy any text you spot in a screenshot straight from the detail view, no retyping required. Create images with text Tap the + button and choose Create Memo to turn a note into a photo. Add a label and it's automatically filed into a matching album, so it's easy to find later. Relive your memories Open an album from a trip or a special day, choose a date, and jump straight to that day's photos. The moments you're looking for, right at your fingertips. **Key features** - Albums shown in date-by-date sections - One-tap jump to any date - Bulk select, delete, and add to albums - Share & Delete—share and organize at once - Batch-change or defer photo dates, with time-of-day and random options - Undo a postpone right after you make it - Routine photos roll forward to today automatically - Copy text from screenshots in one tap - Create text images, auto-filed by label
Screenshots
Verdict
The clearest difference is price: DeferDeck at Free against CalCs's $0.49. DeferDeck also leads on in-app purchases (none vs 3) and update cadence (every 2 days vs every 5 days). CalCs's advantage is ads (none vs shown) and iOS requirement (15.0 vs 18.0). On 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
DeferDeck is free to download; CalCs costs $0.49 up front. CalCs sells 3 one-off in-app purchases. DeferDeck asks for nothing beyond the download.
CalCs ships an update every 5 days, DeferDeck every 2 days. The most recent releases landed on October 20, 2026 and October 13, 2026 respectively.
| Parameter | CalCs | DeferDeck |
|---|---|---|
| Price | $0.49 | Free — better |
| Rating | 4.6 (11 ratings) — better | — |
| Positive reviews | 67.1% of reviews | — |
| Number of ratings | 11 — better | — |
| Update frequency | Every 5 days | Every 2 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 5 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Akihiro Usui | Yasuko Shikiuchi |
In-app purchases
CalCs
- Snack-Sized Tip$0.49
- Coffee-Sized Tip$1.99
- Lunch-Sized Tip$3.99
DeferDeck
No in-app purchases









