Just Calendar vs Complication Lab
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Just Calendar
This app provides a straightforward calendar experience for your Apple Watch, offering enhanced viewing options for past and future events. It allows you to check dates, view schedules by week, month, or year, and quickly access event details directly from your watch face.
- View past and future event timelines
- Calendar views: week, month, year
- Date complication on watch face
- Event complication on watch face
- Customizable highlight color and layout
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See your date, schedule, and events at a glance — right on your Apple Watch face. Just Calendar brings week, month, and year views to your wrist, with complications for every watch face. THE CALENDAR APPLE WATCH SHOULD HAVE COME WITH. ◆ Events at a glance See your full timeline of upcoming and past events, and tap any event for details. ◆ Week, month & year views A clean, fast interface to scan your whole week, month, or year in seconds. ◆ Date complication Keep today's date on your watch face. Works with every face — no compatibility worries. ◆ Event complication See today's events right on your watch face. Works with every face too. ◆ Make it yours Change or invert the highlight color of the Date complication, and switch the app layout: Default or Paging. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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.
- 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
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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
Verdict
The clearest difference is rating: Just Calendar at 4.3 against Complication Lab's 3.5. Just Calendar also leads on ratings volume (294 vs 4) and update cadence (weekly vs every 4 weeks). On price, ads, in-app purchases and monetization model 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
Both are free to download. Just Calendar sells 12 in-app purchases, starting at $1.49 per 3 months and Complication Lab sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
Just Calendar holds the better App Store score, 4.3 against 3.5. That said, the two scores are not equally well evidenced: Just Calendar has 294 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 37% of Just Calendar's written reviews are positive against 23% of Complication Lab's.
Just Calendar ships an update weekly, Complication Lab every 4 weeks. The most recent releases landed on August 27, 2026 and September 2, 2026 respectively.
| Parameter | Just Calendar | Complication Lab |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (294 ratings) — better | 3.5 (4 ratings) |
| Positive reviews | 36.6% of reviews — better | 22.5% of reviews |
| Number of ratings | 294 — better | 4 |
| Update frequency | Weekly — better | Every 4 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, Apple Watch |
| Requires iOS | 18.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 40 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Tu Hoang | Olberry |
Customer experience
Just Calendar
Complication Lab
Bugs and requests
Just Calendar
Reported bugs
28 issues- Complication not updating/showing random events
- App crashes on opening
- Syncing issues
- Payment not recognized
- App not opening after purchase
Show 23 moreShow fewer
- Date recognition errors
- Complication displays app name instead of date
- Graphical glitches in complications
- Missing events in between scheduled times
- App not covering current year (2021)
- Incorrect grammatical errors in event count
- Repeats months in three-month view
- Complication is black/empty
- Settings crash on iPhone app
- Schedule complication never updates
- App not syncing to watch after unlocking features
- Date compilation not working on watch face
- App not displaying on Watch
- Event Timelock not reflecting on Apple Watch
- Stopped syncing
- First appointment of the day displayed all day on watch face
- Never syncs properly to watch
- Crashing on each attempt to open
- Crash crash crash
- Complication issue (JUST CA...)
- Corner complications misfit and off center
- App not showing events in August-September
- App not showing Google calendar events
Requested features
7 requests- More complication options
- Calendar display in complications
- Ability to delete completed tasks directly
- Option to show tomorrow's events in complication when no current events
- 24-hour time format option
Show 2 moreShow fewer
- Calendar week display
- Sunday as the first day of the week setting
Complication Lab
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Just Calendar
- Three Months Premium7 Days trial$1.493 Months
- Monthly Subscription3 Days trial$1.991 Month
- One Year Premium7 Days trial$6.991 Year
- 7-day Trial PremiumFree
- Feature: Date Complication$0.99
- Feature: Event Timeline$0.99
Show 6 moreShow fewer
- FULL VERSION$1.99
- Feature: Date Complication$1.99
- Feature: Paging Layout$1.99
- Feature: Event Timeline$1.99
- 33% OFF Premium$2.99
- FULL VERSION$9.99
Complication Lab
- Monthly Subscription$0.991 Month
- Yearly Subscription7 Days trial$9.991 Year
- Lifetime Subscription$29.99
Questions
Is Just Calendar free?
Is Complication Lab free?
Which has better reviews, Just Calendar or Complication Lab?
Do Just Calendar or Complication Lab have ads?
Which is updated more often, Just Calendar or Complication Lab?
Other comparisons
