Comparison

Cal Countdown vs Complication Lab

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

Head to head
About

Cal Countdown

This app automatically displays a color-coded countdown to your next calendar event. It's designed for quick glances on your Apple Watch face or iPhone "Today" screen, helping you manage your schedule efficiently without manual calculations.

Highlights
  • Automatic countdown to next calendar event
  • Color-coded urgency indicators
  • Apple Watch complication support
  • iPhone "Today" widget
  • Calendar data integration
  • Option to skip specific events
Features
Read full description

"Cal Countdown" is a free, simple iOS & Apple Watch app that automatically creates a color-coded countdown to the next event on your calendar and displays it on your Apple Watch face and/or your "Today" screen. The app is primarily intended to be used as a complication on your Apple Watch or as a widget. If your days are anything like ours, packed with various meetings scattered throughout the day, every time you check your calendar, you're trying to figure out one thing: How much time do I have until my next appointment? So, you glance at your watch, note the start time of your next appointment, and calculate the difference between the current time and your next event. We got tired of doing this mental calculation many times a day, but much to our surprise, we could not find an existing iOS application that would do this chore for us. So we decided to build it ourselves. Now, every time we glance at our watch, it immediately tells us what we want to know: How much time do I have until my next appointment? The app's color changes from blue to green to yellow to orange to red as you approach the start of your next event. (6+ hours = Blue, 2-6 hours = Green, 1-2 = Yellow, 30-60 mins = Orange, 0-30 mins = Red) Cal Countdown supports all the different Apple Watch complications. All Apple Watch complications that support multi-color will be color-coded (but not all watch complications support multiple colors.) Using "Cal Countdown" is as easy as it gets. It uses the calendar data already on your phone; no signing in; no entering any usernames or passwords. The app lets you select the calendars you want to include or not in your calendar countdowns. Don't have an Apple Watch? You can still use Cal Countdown on your phone as an iPhone/iPad app with a "Today" widget. Cal Countdown does not require an account. It does not even require an internet connection. The app uses the calendar data already on your iPhone. It's completely secure. Your calendar data remains completely private, and never leaves your phone. Cal Countdown also has the ability to ignore or skip certain events on your calendar. This feature is especially useful if you have shared calendars with your family, friends, or colleagues. We often have events on our calendars that we need to know about, but may not be attending ourselves. If you want Cal Countdown to ignore or skip these events and start counting down to the following event on your calendar, just tap the "Ignore" button, and Cal Countdown will immediately start a countdown to the following event.

About

Complication Lab

Personalize your Apple Watch and iPhone with custom complications and widgets. Display health data, HomeKit information, and more with extensive customization options. Create an unlimited number of unique setups to match your lifestyle.

Highlights
  • 30+ health data types
  • Apple Watch complications
  • iPhone Lock Screen widgets
  • iPhone Home Screen widgets
  • HomeKit data integration
  • Custom colors and styles
  • Unlimited complications and widgets
Features
Read full description

Complication Lab makes your Apple Watch and iPhone truly yours — now with lock screen widgets and HomeKit data support! • Pick from 30+ health data types, like heart rate, blood oxygen, and more. • Add your favorite health stats to Apple Watch Complications, iPhone Lock Screen Widgets, and iPhone Home Screen Widgets. • Bring in HomeKit data for your Home Screen Widgets. • Personalize every detail with custom colors and styles. • Stay on top of your goals in a way that feels effortless. • Create unlimited complications and widgets—mix, match, and make it yours! Complication Lab is designed to take full advantage of the latest watchOS and iOS features. Your health, activity, and HomeKit data stay on your device. We value your privacy as much as you do. Take control. Have fun. Build the perfect setup for your life.

Screenshots

Cal Countdown4 screens
Complication Lab4 screens

Verdict

The call

The clearest difference is review sentiment: Cal Countdown at 95% against Complication Lab's 23%. Cal Countdown also leads on rating (5.0 vs 3.5) and in-app purchases (none vs 3). Complication Lab's advantage is update cadence (every 4 weeks vs every 3 months). On price and ads 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. Complication Lab sells 3 in-app purchases, starting at $0.99 per month. Cal Countdown asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Cal Countdown holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: Cal Countdown has 21 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 95% of Cal Countdown's written reviews are positive against 23% of Complication Lab's.

UpkeepUpdate frequency

Cal Countdown ships an update every 3 months, Complication Lab every 4 weeks. The most recent releases landed on September 19, 2026 and September 2, 2026 respectively.

Scorecard8 real differences · 2 level
Cal Countdown versus Complication Lab: the parameters behind the verdict, then further details
ParameterCal CountdownComplication Lab
PriceFreeFree
Rating5.0 (21 ratings) — better3.5 (4 ratings)
Positive reviews94.7% of reviews — better22.5% of reviews
Number of ratings21 — better4
Update frequencyEvery 3 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, Apple Watch
Requires iOS15.0 — better17.6
Further details — not scored
Size19 MB11 MB
Age rating4+4+
DeveloperFranck ReyhermeOlberry

Customer experience

Cal Countdown

All ratings22 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews19 reviews
Positive94.7%
Neutral0.0%
Negative5.3%

Complication Lab

All ratings4 ratings
Positive50.0%
Neutral25.0%
Negative25.0%
Written reviews40 reviews
Positive22.5%
Neutral12.5%
Negative65.0%

In-app purchases

None

Cal Countdown

No in-app purchases

3 purchases

Complication Lab

Subscriptions2
  • Monthly Subscription$0.991 Month
  • Yearly Subscription7 Days trial$9.991 Year
One-time1
  • Lifetime Subscription$29.99

Questions

Is Cal Countdown free?
Cal Countdown is free to download, with no in-app purchases.
Is Complication Lab free?
Complication Lab is free to download, with in-app purchases available.
Which has better reviews, Cal Countdown or Complication Lab?
Cal Countdown is rated higher. Cal Countdown averages 5.0 out of 5 from 21 ratings, while Complication Lab averages 3.5 from 4 ratings.
Do Cal Countdown or Complication Lab have ads?
Neither Cal Countdown nor Complication Lab shows ads.
Which is updated more often, Cal Countdown or Complication Lab?
Cal Countdown ships an update every 3 months, and Complication Lab every 4 weeks. Most recently, Cal Countdown was updated on September 19, 2026 and Complication Lab on September 2, 2026.

Other comparisons