Comparison

Clockwise vs Zill

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

Head to head
About

Clockwise

Easily track time zones for friends, family, and colleagues worldwide. Features dynamic backgrounds, personalized photos, and home-screen widgets for at-a-glance updates. Supports over 200k locations, even offline, and syncs across devices via iCloud.

Highlights
  • Automatic time zone detection
  • Time scrubbing for planning
  • Dynamic sky backgrounds
  • Personalized contact photos
  • Home-screen widgets
  • Daylight Saving Time alerts
  • Offline location database
Read full description

Tired of calculating time zone differences? Meet Clockwise, the ultimate app for tracking the time of friends, family, and colleagues around the world! • Simple Setup Just enter someone’s name (or select from your contacts), choose their location, and we’ll automatically detect their time zone! • Time Scrubbing Easily shift the time forwards or backwards to plan and coordinate across time zones. • Dynamic Sky Backgrounds Watch the sky come to life with beautiful colors that change in real-time, reflecting the actual sunrise and sunset of each person’s location. • Personalized Photos Add a personal touch by uploading photos of your loved ones. You can scale and crop images to get the perfect fit! • Widgets Stay connected at a glance with home-screen widgets that display the local time of your friends and family without even opening the app! • Daylight Saving Time Never miss a time change again! Stay informed of upcoming daylight saving time changes around the world. • Contact Linking Import your contacts and call or text them directly from the app. Getting in touch with your friends and family abroad has never been easier! • Clock Customization Select from a variety of clock display options, including both analog and 24-hour formats. • Extensive Location Database Choose from over 200k locations worldwide, even offline. Whether it’s a big city or a small town, we’ve got you covered. • iCloud Sync Sync your contacts and their time zones across all your devices via iCloud. Clockwise is available on both iPhone and iPad.

About

Zill

Features
Read full description

Zill shows the sun's exact path wherever you are, and the shade that comes with it. Plan where to park so your car stays cool, see the shadows of any hour through your camera, and know when the light comes and goes all year. Everything is computed on your phone with the NREL Solar Position Algorithm, corrected for your altitude and the live weather. THE SUN, PRECISELY - Sunrise, sunset, solar noon, golden hour, blue hour and twilight for any place and any day - The sun's direction and height at any moment, on a live sky arc and a compass - The real sunrise and sunset behind hills, from the terrain horizon - Sky quality: how colorful sunrise and sunset will be, from the forecast clouds - Shadow length for any object, and a sun map you can share as a link PARK IN THE SHADE - Save the places you park. Zill brings in the buildings, trees and walls around them from OpenStreetMap - See when the shade reaches your car and when the sun finds it - The best spot and heading for your car during your stay - A cabin heat estimate and a windshield and window cover plan - A sun alert before the sun reaches your car SHADOW LENS - Point your camera anywhere and see the shadows of any hour, on any day of the year - Place cars, people, poles, walls and trees, or trace real objects, and watch their shadows move - Hours of sun on the ground, the best shaded spot and a sunshade designer - Compare two times, save scenes, and share photos and time-lapse videos SHADE MAP, 3D AND VR - A top-down shade planner with hours of direct sun - Your street in lifelike 3D at any hour of any day: the real sky from sunrise to a moonlit or starry night, the buildings, trees and streets around you, and lit windows and street lamps after dark - The exact shadow outline from Zill's shade calculation, drawn over the 3D view - Tap any spot to see when it has sun and shade today and what shades it, then park there or look around from it - A VR view for a headset SUN SEASON: A NEW FEATURE EVERY MONTH Twelve features arrive through the year, one on the 1st of every month: Pocket Sundial, Daily Sun Quiz, Glare Guard, Day and Night Map, Sun Meter, Window Sun, Daylight Race, Plant a Shade, UV Burn Timer, Sun Diary, Sun Badges and Your Sun Year. Each one is free during its month. ZILL PRO (one-time purchase) - Keep all twelve monthly features for good - Open each new feature 7 days before everyone else Everything else in Zill is free, with no account. The free version shows ads; Zill Pro removes them. Fully in English and Arabic. Sun, shadow, glare and UV figures are estimates for planning. Never use the app while driving. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://zill.teknawi.net/privacy

Screenshots

Clockwise4 screens
Zill4 screens

Verdict

The call

The clearest difference is in-app purchases: Clockwise at none against Zill's 1. Clockwise also leads on ads (none vs shown) and iOS requirement (16.1 vs 18.0). Zill's advantage is update cadence (every 11 days vs every 6 weeks). On price and 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Zill sells 1 one-off in-app purchase. Clockwise asks for nothing beyond the download.

UpkeepUpdate frequency

Clockwise ships an update every 6 weeks, Zill every 11 days. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

Scorecard4 real differences · 6 level
Clockwise versus Zill: the parameters behind the verdict, then further details
ParameterClockwiseZill
PriceFreeFree
Rating4.8 (18 ratings) — better—
Positive reviews92.9% of reviews—
Number of ratings18 — better—
Update frequencyEvery 6 weeksEvery 11 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.1 — better18.0
Further details — not scored
Size35 MB14 MB
Age rating4+4+
DeveloperBrittany PetrovaTariq Al-aqrabawi

In-app purchases

None

Clockwise

No in-app purchases

1 purchases

Zill

One-time1
  • Zill Pro$5.99

Questions

Is Clockwise free?
Clockwise is free to download, with no in-app purchases.
Is Zill free?
Zill is free to download, with in-app purchases available.
Do Clockwise or Zill have ads?
Zill shows ads; Clockwise does not.
Which is updated more often, Clockwise or Zill?
Clockwise ships an update every 6 weeks, and Zill every 11 days. Most recently, Clockwise was updated on November 3, 2026 and Zill on November 6, 2026.

Other comparisons