Do not use this
I had 100s of duplicates on my iPhone contact list. I used this to merge them and it made a huge mess of it. It merged contacts that have nothing to do with each other. They cannot be unmerged. The problem was that you coud go one by one and agree to merge or do all At once. Because I had too many to do one at a time I had to do the latter. Don’t use this if you also need to merge many contacts.
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Response from developer
I'm sorry the batch merge combined contacts that should have stayed separate, and that you couldn't undo it. I understand how disruptive this is, especially with hundreds of contacts. Since then, I've added stricter duplicate checks, a separate review step for uncertain matches, and local recovery records for recent operations. These changes cannot recreate a recovery record for an older merge, so I can't promise that the contacts affected at the time can be restored. If you're willing, please email me with the app version you used (if known), your iOS version, and a brief description of what happened. I'll help you check what options may still be available. Please don't send your full address book.
