If your goal is retro or jailbreak-related archiving (for legally owned devices), I’d recommend searching specialized forums like r/LegacyJailbreak on Reddit, where users discuss preservation of old software under fair use/archival exemptions — but always respect copyright laws.
Momentum Dev is the premier hub for "legacy" iOS users. They host a massive archive of apps specifically curated for iOS 3 through iOS 7. Their community verifies files to ensure they are functional and safe. 2. Archive.org (The Internet Archive) ios 7 ipa archive free
A critical issue for users of these devices is the unavailability of compatible software. Modern applications typically require recent versions of iOS, and the App Store frequently prevents the downloading of older, compatible versions. Consequently, a market for "IPA archives"—repositories of decrypted application files—has emerged. This paper analyzes the implications of this practice. If your goal is retro or jailbreak-related archiving