More than just an extractor, this is a full-blown file manager. It can open almost any file format and has a built-in browser for downloading archives directly.
Some third-party app stores provide "signed" versions, but these are frequently revoked by Apple. Top ZArchiver Alternatives for iPhone and iPad
As of the current App Store landscape,
TrollStore is a permanent sideloading utility that works on iOS 14.0 through 15.4.1 (and some betas). It uses a CoreTrust bug to install IPAs permanently without expiration.
Keeping related project files in a single .7z or .zip archive keeps your "Files" app from becoming cluttered.
I can point you toward the for your exact needs.
If you see websites offering a "ZArchiver.ipa" file for download, be extremely cautious. These are often: