# Contacts Optimizer Pro — Ultimate app for your contacts > Intelligent contact management for deduplication, cleaning, and optimization. (iPhone/iPad app by Compelson s.r.o..) - Source: https://appshunter.io/ios/app/contacts-optimizer-pro/id908963063 (this page in markdown: same URL + `.md`) - Developer: [Compelson s.r.o.](https://appshunter.io/developer/541065300) - Category: Productivity, Utilities - Price: $8.99 - Rating: 3.30/5 from 70 App Store ratings · 92 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 2 MB - Languages: English - Released: 2015-01-30 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/contacts-optimizer-pro/id908963063/reviews.md ## What is Contacts Optimizer Pro? Your contacts are probably the most important data in your phone, right? Contacts Optimizer will deeply analyze your phonebook, deduplicate it, fix all possible issues and bring it close to perfection. The built-in intelligence will surprise you. Contacts Optimizer will save you hours of work and is one of a few apps which quickly pays for itself. Users say it is so useful it should be preloaded on every phone. This application is extremely popular on other platforms, now available fully featured for iOS! Contacts Optimizer has powerful features, while its beautifully simplified design allows everybody to use it. Here is the list of features: • Find all possible duplicates and even similar contacts • Move contacts between different accounts, such as iCloud, Exchange, Gmail • Mass copy contacts between accounts • Mass delete contacts you no longer need • Powerful editing of contacts • Can't find a newly created contact? List all contacts sorted by modification date! • Display all upcoming birthdays for your contacts • Search and replace enables mass changes in contact names, country codes, notes, emails and all other fields • Easily remove birthdays of contacts of which you do not want reminders • Filtering of contacts provides you an easy way to work with a group of contacts • Automatic and manual merge contact fragments into one rich contact • Add international prefixes and country codes where needed so you can call from abroad • Correct and nicely format phone numbers • Smart capitalization, for names such as McDonald etc. • Locate potentially incorrect contacts which cannot be dialed • Find all incomplete contacts that have an important contact field empty • Clean contacts removing empty fields • Manage photos for contacts • 3D Touch support with important shortcuts What users say: * Try it, it's number 1 I can say with confidence it's amazing app It saved a lot of my time since I have most of my contacts without country code Now all setup well Thank you * Excellent app I rarely rate 5 stars. This one deserves them! I have tried many contacts managers and so far this app beats them all. I like its ability to fix the phone format, adding the + sign and converting the letters to digits. I strongly recommend while it is free. * Tech masterpiece Most advanced and sophisticated app for contacts management! - luck of understanding of short local numbers - luck of understanding abbreviation * Amazing App This app is amazing, it helped me delete, clean and simplify my address Book without having the need to sync to my laptop. For a person who's a bit OC this will unify the look and format of your contacts easily! Love it * Very Happy I have used many contacts optimizers in the past, but in my opinion this is the best one that I have ever used. It's very clear to me what is occurring as it is, and my address book with many entries survived intact and improved! * Best contacts optimising app ever I was struggling to remove duplicate contacts from my phone.i downloaded 10 other apps.but this is the one which does the work best. Thankyou * Better than perfect Just takes 10 minutes to clear my 5000 duplicate contacts. Must use app. ## Key features - Find and merge duplicate contacts - Mass delete and edit contacts - Move contacts between accounts - Format and correct phone numbers - Display upcoming birthdays - Search and replace contact data - Clean empty fields and incomplete contacts ## What do users think of Contacts Optimizer Pro? Overall sentiment: mixed **Pros** - 🚀 Fast and efficient batch processing of contacts - 👍 User-friendly interface and easy to use - ✨ Effective duplicate detection and removal - 🌍 Excellent international phone number formatting - 💰 Affordable one-time purchase price - 🔧 Multiple contact management tools in one app - ✅ Works well with iCloud contacts - 📱 Handles large contact lists (1000+ contacts) - 🎯 Accurate contact merging with preview functionality - 💬 Responsive developer support (historical) **Cons** - 🐛 Frequent crashes and compatibility issues - ❌ Does not work with Exchange Server accounts - 🔌 Poor syncing across devices and cloud accounts - ⚠️ Dangerous data loss and unintended deletions - 🚫 Fails to recognize contacts on some devices - 🌐 Non-English character handling is broken - 📞 Incorrect phone number field modifications - 🔍 Inaccurate duplicate/similar contact detection - 📧 Inadequate customer support and communication - ⏱️ App crashes during analysis of large contact lists - 🔄 Sync failures between accounts and devices - ❌ Does not work reliably on iOS 14+ - 🎨 Poor color contrast for colorblind users **Commonly reported bugs** - App cannot read contact list on some devices - Crashes after analyzing 12% of large contact lists - Non-English characters marked as invalid and removed - Incorrect letter-to-digit conversion in number fields - Failure to communicate with contacts service error - App crashes during Edit Contacts function - Sync does not carry over to other devices - Creates new duplicate entries after cleanup - Does not work with Exchange Server - Incompatibility with iOS 14 and later versions - Cannot find duplicates in large contact databases - Similar contacts detection shows unrelated contacts - Missing activation key after App Store purchase - No account information or profile page accessible **Most requested features** - Selective field modification (phone numbers only, names only, etc.) - Regex support for search and replace - Default field customization for all contacts - Area code addition to local phone numbers - Ability to select specific phone numbers within a contact to modify - Better handling of business contacts without first/last names - More granular merge options with additional matching criteria - Dark mode option - Clearer app description of capabilities ## Recent user reviews (10 of 92) All indexed reviews: https://appshunter.io/ios/app/contacts-optimizer-pro/id908963063/reviews.md ### 2/5 — Disappointed - not with it *2025-05-13* I was disappointed. Hit this based on a review to merge/delete duplicate contacts, and app promises to do a lot more. But 1. It sees all non-English characters in a contact as invalid. If you have contacts with (say) Hebrew names, app wants to remove them 2. It tried to change any letter in a number field into its equivalent digit. So if I have a contact they say ‘ext: 1234’ app wants to change it into ‘398: 1234’ 3. It has a functions to handle ‘similar’ contacts, but shows totally different contacts as similar ### 5/5 — App works very well in IOS 14+ *2025-01-29* I saw some feedbacks saying it didn’t work, but it works for me very well. Great app for the price! ### 1/5 — No Support *2024-03-08* Everything I tried to do to ask a support question results in a form, where I am asked if I purchased a license, and I checked the box to indicate yes. The form then asks for an activation key I have looked at all my emails and received, no application key email today, when I purchased the product through the Apple App Store. I have looked all over the application, and can find no activation key, or any sort of profile page with account information about my account. This is the only way I seem to be able to send a message. I hate to do it this way, but I need support. I need communications. Thank you. Rick. ### 3/5 — A great but flawed app *2023-02-07* Contact management is extremely important for all people. And smartphones are dumb at managing contacts. This app helps, however, it seems to have some significant difficulties syncing completely and correctly. After sorting out thousands of contacts, i download the app on another phone with all the same gmail and i cloud and outlook accounts logged into, but the sync has not been able to carry over to the accounts and other devices. This is actually dangerous as it can potentially erase all your hard work, and even create new duplicate contact entries, creating more headache and confusion. Fix the sync to accounts issue and its 5 stars. ### 4/5 — Can’t add field to all contacts by default, but does everything else *2023-01-17, version 4.3.2* I was hoping to change the default fields displayed in contacts (add a new field such as prefix to all my contacts). Sadly this app can’t help but it looks like an excellent contacts management tool. ### 1/5 — Warning! Does not work with Exchange Aerver *2022-06-21* I copied contacts from one Exchange account to another. On the iPhone, it appears to have worked. But. The changes did not sync back for the target account. In Outlook client on a Mac, contacts were lost. When logging into the Exchange Server directly with OWA, contacts were lost. DOES NOT WORK WITH EXCHANGE SERVER. The only cloud account that works is iCloud. DESERVES NEGATIVE 10 RATING ### 1/5 — Not what I wanted *2022-02-08* I thought this app would add area codes to my local seven digit phone numbers but I can’t figure out if it will or how to do it. Zero stars ### 3/5 — Unsure what this is for. *2022-01-18, version 4.3.1* Tried to use this to combine various accounts on any new iPhone. Didn’t work and unsure what this app actually achieves? A lot of money. Maybe description needs to be clearer? ### 5/5 — App works very well in IOS 14+ *2021-07-15, version 4.3.1* I saw some feedbacks saying it didn’t work, but it works for me very well. Great app for the price! ### 1/5 — Not working *2021-02-16* It can’t even read my contact list let alone do the other things it claims to do. Mist be a compatibility issue and if that’s the case an update is required ASAP! I’m on iOS 14.5. **Developer response:** iOS 14 finally supported! Apple has started to require a new approval process for apps with the editing notes capability in contacts, which we need to reliably evaluate duplicates. We finally got through. Sorry for letting you wait. We are working on new features. If you like the Contacts Optimizer, please rate it. ## Frequently asked questions about Contacts Optimizer Pro ### What does Contacts Optimizer Pro do? Contacts Optimizer Pro deeply analyzes your phone's contact list to deduplicate entries, fix errors, and optimize your address book. It helps you manage your contacts efficiently by offering features like mass deletion, editing, and formatting. ### What are the key features of this app? Key features include finding and merging duplicate or similar contacts, mass deleting unwanted contacts, moving contacts between accounts (like iCloud, Gmail), powerful editing tools, and the ability to correct and format phone numbers. It also helps locate and fix incomplete or incorrect contacts. ### Is Contacts Optimizer Pro free to use? Based on the provided information, the application is free to use. There are no mentions of in-app purchases or subscription models, indicating it is a free application. ### What kind of contacts issues can this app fix? The app can fix a wide range of contact issues, including duplicate entries, similar contacts, incomplete contact fields, and potentially incorrect contacts that cannot be dialed. It also corrects and formats phone numbers, adds international prefixes, and performs smart capitalization for names. ### Who would benefit from using Contacts Optimizer Pro? Anyone with a large or disorganized contact list would benefit from this app. It's particularly useful for individuals who want to save time managing their contacts, ensure data accuracy, and maintain a clean and unified address book without needing to sync with a laptop. ## Version history (last 5 releases) ### 4.3.2 — 2022-02-10 Updated for iOS 15 ### 4.3.1 — 2021-04-01 4.3.1 Fixed purchase restore 4.3 iOS 14 support ### 4.3 — 2021-03-27 iOS 14 finally supported! Sorry for letting you wait. If you like Contacts Optimizer, please rate us... ### 4.2.1 — 2018-01-01 Changed from in-app to standard paid app. Everyone who downloaded the app even for free will have the PRO version after this update. Happy New Year 2018! ### 4.2 — 2017-11-22 iPhone X supported Stability improvements ## Apps similar to Contacts Optimizer Pro | App | Rating | Price | Category | | --- | --- | --- | --- | | [Easy Caller ID](https://appshunter.io/ios/app/easy-caller-id/id665856919) | 4.4 (2,690) | Free | Productivity | | [Contact.s Back Up](https://appshunter.io/ios/app/contacts-back-up/id1474294286) | 4.5 (1,169) | Free | Productivity | | [Contacts Sync: Google & More](https://appshunter.io/ios/app/contacts-sync-google-and-more/id454390333) | 4.4 (1,669) | Free | Productivity | | [Backup Contacts Cleaner](https://appshunter.io/ios/app/backup-contacts-cleaner/id1234917118) | 4.6 (510) | Free | Productivity | | [MCBackup : My Contacts Backup](https://appshunter.io/ios/app/mcbackup-my-contacts-backup/id1218096409) | 4.7 (2,278) | Free | Productivity | | [Cleaner: Merge Contact & Photo](https://appshunter.io/ios/app/cleaner-merge-contact-and-photo/id906910407) | 4.7 (3,949) | Free | Productivity | ## More apps by Compelson s.r.o. - [MOBILedit](https://appshunter.io/ios/app/mobiledit/id541065297) - [MOBILedit Pro](https://appshunter.io/ios/app/mobiledit-pro/id547602472) All apps by Compelson s.r.o.: https://appshunter.io/developer/541065300 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*