Comparison

Contact Groups vs World Time Clock Master

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

Head to head
About

Contact Groups

Easily create and manage contact groups directly on your device. Organize frequently contacted people for quick access, send group emails, or text multiple recipients at once. Export contacts as VCards for backup or sharing.

Highlights
  • Create and manage contact groups
  • Directly edit Apple Contacts database
  • Send group emails
  • Send group SMS/text messages
  • Export contacts as VCard
  • Delete multiple contacts
Features
Read full description

"Thanks very much. Very happy. A very useful app." AB, Nov 2020 This app creates and manages Groups in the Apple Contacts app database directly on the iDevice. The groups and their members are stored in the Contacts database. If it is in an iCloud account then iOS manages the synchronisation automatically. The app makes it very easy to create groups of frequently-used contacts eg those people you call frequently without having to search for them in Recents or putting them all in Favourites. All on your iDevice without having to resort to laptops or web-based apps to manage the Contacts that are on your device. The app can display and edit a Contact's details using the same interface as the Apple Contacts app. Contact first name, last name and organisation are checked when searching to filter the contacts in a list - those in the current group or those not in the current group. In the Group list, tap and hold or carefully swipe right to left to change the name of a group. The list of Groups can be sorted alphabetically by using the switch in Settings->Contact Groups. Contact Groups can send an email to all members of a group. Contact Groups can create and add qualifying recipients to an SMS/text message for groups that contain Contacts with a mobile number in the following countries: Australia, New Zealand, United Kingdom, France, Germany, Netherlands, South Africa, Namibia, Zimbabwe, Eswatini, Lesotho, Mozambique and Türkiye. Only numbers prefixed with + and the country code of the above countries and the digits which identify a mobile/cell number for that country are recognised. Canada and the United States of America are not included because there seems to be no way to distinguish a mobile/cell number from a landline phone number. The user can enter the relevant text. The app is not responsible for sending the message nor for any errors that may occur eg if the user does not have the ability to send texts internationally or the mobile number is incorrect etc. Contact Groups can select and delete multiple contacts at the same time - select a group, tap Not In Group, tap Select and then select one or more contacts and tap the trash can that has appeared. A confirmation dialog will appear. A Contact can be added to or removed from Groups: long-press the Contact to show the Groups to which it belongs. Swipe right-to-left to remove it from a Group. Tap Add to Groups to see a list of groups to which the Contact does not belong. Tap a Group to add the Contact to that Group. This can also be achieved by tapping the Contact to display Apple's Contact interface and then scrolling to the bottom to the 'Included in List' section. The Contacts in a Group can be exported via the app as a VCard file for sharing or importing into other machines and devices, or saved to Files or DropBox etc for backup purposes. The app itself does not send any data to any server. Due to Exchange issues, the app is unable to create groups in Exchange/Outlook accounts. SUPPORT If you encounter any issues please use the email link at the bottom of the Help screen or on the Developer Website link on this screen.

About

World Time Clock Master

Effortlessly manage multiple time zones with this app. Convert times instantly, schedule events, and view global clocks at a glance with interactive widgets. Features atomic accuracy and a vast database of locations.

Highlights
  • Multiple time zone display
  • Interactive time conversion
  • Event scheduling
  • Atomic time accuracy
  • Dynamic home screen widgets
  • List mode for text view
  • Real moon phases and sunrise/sunset
Features
Read full description

THE EASIEST WAY TO DEAL WITH MULTIPLE TIMEZONES + INTERACTIVE WIDGETS Sick of screwing up meeting times and missing calls? This app cuts through time-zone confusion and hands you the perfect hour at a glance. Forget guesswork — just click, connect, and impress. KEY FEATURES EVENT SCHEDULING MADE EASY Found the perfect meeting time? Add events to your calendar with just a tap, and never miss an international webinar, call, or special moment again. ATOMIC ACCURACY No drift, no guesswork. Each second syncs with the atomic standard, so you can trust every moment. Extensive Time Zone Database: Tap into over 160,000 locations and time zones including GMT, UTC, and more. UNIFIED CLOCK FACE View all your essential time zones at a glance on one beautifully designed, customizable clock face. Whether you prefer digital or analog displays (or even military time), everything is exactly where you need it. INTERACTIVE TIME CONVERSION Convert times instantly by simply twisting or swiping across the clock face. Watch as your selected time zones update in real time—making planning international calls, meetings, or travel effortless. DYNAMIC WIDGETS Access global times without even opening the app. Our interactive home screen widget lets you drag a simple line to reveal and convert times, ensuring you’re always in sync no matter where you are. LIST MODE Get a clean, text-based view of all your cities in one column. See times and dates at a glance, and scroll to check future or past hours. It’s a no-fuss way to track the world’s clocks. FEELS LIKE A LUXURY TIMEPIECE We poured effort into details most people never notice — and we’re okay with that. Our users aren’t “most people.” Details include: — Real Moon Phases — Real Moon Rotation — Real Sunrise & Sunset — Advanced City Lights — Haptic Feedback * * * World Clock Master offers a premium subscription: Subscribe to get access to unlimited timezones, interactive widgets, customizations, and timely automatic updates of our timezone database of more than 160,000 locations and timezones. – Length of subscription: 1 month or 1 year – Payment will be charged to iTunes Account at confirmation of purchase – Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period – Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal – Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase – Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable – Terms & Conditions: https://timemaster.s3.amazonaws.com/Time-master-terms.pdf

Screenshots

Contact Groups4 screens
World Time Clock Master4 screens

Verdict

The call

The clearest difference is price: World Time Clock Master at Free against Contact Groups's $0.99. World Time Clock Master also leads on rating (4.6 vs 3.5) and review sentiment (66% vs 40%). Contact Groups's advantage is in-app purchases (none vs 13) and iOS requirement (12.0 vs 17.0). On update cadence, ads 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

World Time Clock Master is free to download; Contact Groups costs $0.99 up front. World Time Clock Master sells 10 in-app purchases, starting at $2.99 per month. Contact Groups asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

World Time Clock Master holds the better App Store score, 4.6 against 3.5. That said, the two scores are not equally well evidenced: World Time Clock Master has 816 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 40% of Contact Groups's written reviews are positive against 66% of World Time Clock Master's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 1, 2026 and October 12, 2026 respectively.

Scorecard7 real differences · 3 level
Contact Groups versus World Time Clock Master: the parameters behind the verdict, then further details
ParameterContact GroupsWorld Time Clock Master
Price$0.99Free — better
Rating3.5 (2 ratings)4.6 (816 ratings) — better
Positive reviews40.0% of reviews65.8% of reviews — better
Number of ratings2816 — better
Update frequencyFortnightlyFortnightly
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid — betterSubscription
DevicesiPhone, iPodiPhone, iPad, Vision Pro — better
Requires iOS12.0 — better17.0
Further details — not scored
Size1 MB236 MB
Age rating4+4+
DeveloperGodfrey RaftesathAlex Komarov Inc.

Customer experience

Contact Groups

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews5 reviews
Positive40.0%
Neutral20.0%
Negative40.0%

World Time Clock Master

All ratings816 ratings
Positive90.8%
Neutral2.8%
Negative6.4%
Written reviews76 reviews
Positive65.8%
Neutral5.3%
Negative28.9%

Bugs and requests

Contact Groups

Not enough reviews yet to summarise bugs or requests.

World Time Clock Master

Reported bugs

4 issues
  • Lose all the registered locations after updating the app
  • Sticky signup interface
  • Widget doesn't work
  • GMT and London currently have a 1 hour time difference between the two locations, but the app shows them the same time

Requested features

4 requests
  • Add the time difference in hours between the default location and other locations in both the widget and the app
  • See my calendar events on the dial
  • Make a paid tier that doesn't collect my data
  • Add new event to a Calendar

In-app purchases

None

Contact Groups

No in-app purchases

10 purchases

World Time Clock Master

Subscriptions6
  • 1 month3 variants$2.991 Month
  • 3 months$3.993 Months
  • 1 year1 Year trial2 variants$11.991 Year
Show 3 more
  • 1 year3 Days trial$11.991 Year
  • 1 year$11.991 Year
  • 1 year3 Days trial$19.991 Year
One-time4
  • Lifetime$29.99
  • Lifetime$49.99
  • Lifetime$79.99
Show 1 more
  • Lifetime$99.99

Questions

Is Contact Groups free?
Contact Groups costs $0.99, with no in-app purchases.
Is World Time Clock Master free?
World Time Clock Master is free to download, with in-app purchases available.
Which has better reviews, Contact Groups or World Time Clock Master?
World Time Clock Master is rated higher. Contact Groups averages 3.5 out of 5 from 2 ratings, while World Time Clock Master averages 4.6 from 816 ratings.
Do Contact Groups or World Time Clock Master have ads?
Neither Contact Groups nor World Time Clock Master shows ads.
Which is updated more often, Contact Groups or World Time Clock Master?
Contact Groups ships an update fortnightly, and World Time Clock Master fortnightly. Most recently, Contact Groups was updated on October 1, 2026 and World Time Clock Master on October 12, 2026.

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