Comparison

Contacts Sync vs aContacts

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

Head to head
About

Contacts Sync

Effortlessly synchronize your contacts across Google, Outlook, and iPhone. This reliable app ensures your contact information is up-to-date everywhere with 2-way syncing and support for all contact fields and photos.

Highlights
  • 2-way contact synchronization
  • Sync Google, Outlook, and iPhone accounts
  • Syncs all contact fields and photos
  • Automatic background syncing
  • Group and custom label synchronization
  • Duplicate contact elimination
Features
Read full description

••• SYNC GOOGLE, ICLOUD, & OUTLOOK! ••• #1 SYNC APP FOR 15+ YEARS! ••• TRUSTED BY 10,000,000+ USERS! With Contacts Sync, you can quickly & easily sync your Google or Outlook contacts with iPhone, giving you access to your contacts wherever you go. This app distinguishes itself with its reliability, ease of use, speed, and with a true "2-way sync" that merges changes made to either account. This is the #1 app for syncing contacts both in terms of downloads & reviews. Also of significance, this app syncs your Google labels or Outlook categories with your iPhone lists. For instance, you may have organized your Google contacts into groups such as "friends," "family," and "coworkers." After a sync, your iPhone and Google groups will match. With your groups configured on iPhone, you can easily send group emails or group messages. SYNC THE FOLLOWING ACCOUNTS: • Sync Google with iPhone • Sync Outlook with iPhone • Sync 2 Google accounts SYNC ANY IPHONE ACCOUNT: • Choose to sync all of your iPhone contacts, or choose to sync contacts from a specific iPhone account, such as iCloud, a local iPhone address book, Outlook, or a CardDAV account SYNC TYPES: • Choose from one of the following sync types: 2-Way Sync, 1-Way Sync, and Manual Sync • Choose a 2-Way Sync to sync changes in both directions • Choose a 1-Way Sync to transfer changes in one direction only • Choose a Manual Sync to sync specific contacts only SYNCS ALL FIELDS: • Syncs all fields including names, phonetic names, nicknames, email addresses, phone numbers, postal addresses, company names, job titles, departments, birthdays, anniversaries, events, notes, web page addresses, relationships, instant messaging accounts, & social profiles • Syncs contact photos • Syncs custom labels & custom fields INITIAL SYNC: • During the initial sync, the contents of matching contacts will be merged CONFIRM CHANGES BEFORE SYNCING: • Review each change before the sync actually begins AUTOMATIC SYNC: • Automatically syncs contacts in the background 24/7 APPLY FILTERS INCLUDING GROUP FILTER: • Apply the group filter, new contact filter, and more! DUPLICATE CONTACTS: • Eliminate duplicate contacts from both iPhone and Google SUBSCRIPTIONS: • Contacts Sync offers a "Premium" subscription which unlocks all of the premium features in the app, including the ability to sync an unlimited number of contacts and to auto sync in the background. • Without an upgrade, the app will sync no more than 40 contacts • The "Premium" subscription is priced at $1.99 USD per week, $2.99 USD per month, or $9.99 USD per 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 • 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 of use: https://playaapps.zendesk.com/hc/articles/360004197333 • Privacy Policy: https://playaapps.zendesk.com/hc/articles/226767688

About

aContacts

This app enhances your address book with powerful contact management tools. Organize contacts into groups, send mass emails and texts, and sync with Google. It also offers backup, restore, and duplicate merging features for a streamlined experience.

Highlights
  • Smart contact management
  • Group creation and management
  • Send group SMS & email
  • Google contacts sync
  • Contacts backup and restore
  • Merge duplicate contacts
  • T9 dialer with search
Features
Read full description

aContacts is smarter address book management tool with more powerful contacts, groups, favorites, sharing, calling and messaging capabilities, and it own an amazing dialpad! aContacts also collections a large number of contact management tools, including Google contacts sync, contacts backup and restore, clean up and merge duplicate contacts, home screen icons, etc., it makes contact management easier and easier. ##### SMART CONTACTS MANAGEMENT ##### * Create, edit and delete contacts * Import contacts from Gmail, vCard, Excel and QR Code * Avatar, company, title, phone number, email, address and personal home page supported in profile * One click to call, send messages/emails, display addresses on the map, and visit personal home page * Send group SMS & email quickly and easily * Search contacts by name, company, title, email * One click to share contacts (Text & vCard) * Create and scan contacts QR code * T9 dialer, type number for fast search * One click to dial, text and view contacts details using T9 dialer * Birthday and Anniversary Reminder ##### SMART GROUPS MANAGEMENT ##### * Create, edit and delete groups * Show unfiled contacts * Add & remove existing contacts from particular group * Add & remove groups from particular contact * Send emails to group with CC or BCC option ##### CONTACTS SYNC FOR GOOGLE ##### * Sync contacts between Google cloud and iPhone/iPod Touch/iPad. Merge or replace information according to configuration. * Identify and merge duplicate contacts automatically and intelligently after the sync. * Sync 2,000+ contacts accurately and completely within seconds using the latest technology. * Support sync of contacts groups. Google/iPhone contacts still in their original groups like Friends or Family after the sync. * Support sync of contacts avatar (can be switched off to save data). * Optimized for iPhone contacts and Google Contacts. Contacts information that can be merged includes: - Name - Phone number - Email - Instant message - Address - Blog - Social Relations - Organization - Anniversaries - Nickname * iPhone/iPod Touch/iPad running iOS5.0+ supported. * Minimalist and intuitive UI, quick start and default setting make your sync/backup extremely easy. Flexible options for advanced users also provided. ##### CONTACTS BACKUP & RESTORE ##### * Support One-Tap Backup and Advanced Backup mode * Bulk-backup contacts to CSV (Excel) or VCF (Apple Address Book) files. * Manual selection of contacts supported. * Bulk-import contacts (CSV & VCF) to iPhone address book. * Match and merge the imported contacts with the local contacts to avoid duplicates. * One-click to send backup files (CSV & VCF). * Share backup files (CSV & VCF) via iTunes. * Share backup files (CSV & VCF) via Web Server built-in app. ##### CONTACTS MERGE & CLEANUP ##### * Search duplicate contacts by contact’s name, phone numbers and emails. * Bulk-merge duplicate contacts. * Search contact that no name, no phones, duplicate phones, duplicate emails. * Bulk-merge contact’s duplicate informations, delete garbage items. ##### OTHER FEATURES ##### * Contacts birthday and anniversary reminders * Add & remove contacts from favorite and send email/message to favorite * Home screen contacts icons feature * Recently added contacts feature

Screenshots

Contacts Sync4 screens
aContacts4 screens

Verdict

The call

The clearest difference is rating: Contacts Sync at 4.6 against aContacts's 4.0. Contacts Sync also leads on update cadence (every 5 days vs every 5 weeks) and ratings volume (15K vs 45). aContacts's advantage is iOS requirement (13.0 vs 17.0). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Contacts Sync sells 7 in-app purchases, starting at $1.99 per 7 days and aContacts sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Contacts Sync holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: Contacts Sync has 15K ratings behind it against 45, so its average is the more settled of the two. Written reviews point the same way: 78% of Contacts Sync's written reviews are positive against 54% of aContacts's.

UpkeepUpdate frequency

Contacts Sync ships an update every 5 days, aContacts every 5 weeks. The most recent releases landed on September 25, 2026 and August 1, 2026 respectively.

Scorecard5 real differences · 5 level
Contacts Sync versus aContacts: the parameters behind the verdict, then further details
ParameterContacts SyncaContacts
PriceFreeFree
Rating4.6 (15K ratings) — better4.0 (45 ratings)
Positive reviews78.2% of reviews — better53.9% of reviews
Number of ratings15K — better45
Update frequencyEvery 5 days — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.013.0 — better
Further details — not scored
Size43 MB37 MB
Age rating4+4+
DeveloperPlaya Apps峥 俞

Customer experience

Contacts Sync

All ratings14,870 ratings
Positive90.4%
Neutral3.2%
Negative6.4%
Written reviews739 reviews
Positive78.2%
Neutral2.3%
Negative19.5%

aContacts

All ratings45 ratings
Positive68.9%
Neutral15.6%
Negative15.6%
Written reviews115 reviews
Positive53.9%
Neutral8.7%
Negative37.4%

User reviews

Contacts Sync

From 15K App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Quick and efficient
  • 💡 Useful for syncing contacts across devices
  • 🔒 Reliable and secure
  • 🙌 Great customer support

Room to improve

  • 🐛 Occasional sync issues
  • 💰 Paid subscription required for more than 40 contacts
  • 🔄 Confusion around syncing and merging contacts
  • 🤔 Inconsistent contact formatting after sync

aContacts

From 45 App Store ratings

What we love

  • 👍 Easy to use and intuitive interface
  • 🔄 Effective contact syncing with Gmail and Google contacts
  • 📊 Excellent contact organization and grouping capabilities
  • 🧹 Strong duplicate contact detection and merging features
  • 📱 Works well across multiple devices

Room to improve

  • 🐛 Frequent crashes and stability issues
  • 🔄 Forced contact syncing without opt-out option
  • 📵 Non-functional buttons and UI elements
  • ⚠️ Duplicate contact creation and merging problems
  • 🔒 Landscape mode not supported on iPad

Bugs and requests

Contacts Sync

Reported bugs

2 issues
  • Deleted contacts reappearing after sync
  • Sync corrupting or deleting existing contact data

Requested features

4 requests
  • Ability to merge duplicate contacts
  • Sync support for Outlook contacts
  • Automatic sync between multiple Google accounts
  • Undo/rollback option for sync operations

aContacts

Reported bugs

14 issues
  • App crashes when moving contacts to groups
  • Contacts disappear after iOS updates
  • Duplicate contacts created (up to 203 times reported)
  • All phone numbers merged into single contact
  • Text messages freeze up
Show 9 more
  • Picture sync failures from Gmail
  • Groups feature disabled or non-functional
  • Contact information not appearing after edits
  • Crashes at certain locations in contact list
  • Repeated password prompts after in-app purchase
  • Backup feature not selecting contacts
  • Contacts stuck in group editing area with no exit
  • Contacts not appearing in groups after being added
  • Sorting issues with same last names

Requested features

8 requests
  • Option to disable automatic contact syncing
  • LinkedIn sync capability
  • Landscape mode support for iPad
  • Quick search by typing first letter
  • CC/BCC functionality for group messaging
Show 3 more
  • Group text messaging without showing all recipients
  • Better support for selecting multiple email addresses per contact
  • Improved app support and customer service

In-app purchases

7 purchases

Contacts Sync

Subscriptions3
  • Premium (1 Week)$1.997 Days
  • Premium (1 Month)$2.991 Month
  • Premium (1 Year)$9.991 Year
One-time4
  • Automatic Contact SyncingFree
  • Make Contribution$4.99
  • Make Larger Contribution$9.99
Show 1 more
  • Premium (Lifetime Access)$11.99
2 purchases

aContacts

One-time2
  • Remove Ads$0.99
  • Unlimited Version$3.99

Questions

Is Contacts Sync free?
Contacts Sync is free to download, with in-app purchases available.
Is aContacts free?
aContacts is free to download, with in-app purchases available.
Which has better reviews, Contacts Sync or aContacts?
Contacts Sync is rated higher. Contacts Sync averages 4.6 out of 5 from 15K ratings, while aContacts averages 4.0 from 45 ratings.
Do Contacts Sync or aContacts have ads?
Neither Contacts Sync nor aContacts shows ads.
Which is updated more often, Contacts Sync or aContacts?
Contacts Sync ships an update every 5 days, and aContacts every 5 weeks. Most recently, Contacts Sync was updated on September 25, 2026 and aContacts on August 1, 2026.

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