FMWhatsApp, in the real sense, cannot be installed on iOS because FMWhatsApp is an application meant for Android users only. FMWhatsApp, a mod of WhatsApp, has gained wide popularity among people for its specialized features: advanced privacy control, customized themes, and a greater extent of file sharing. Still, the closed ecology of iOS and the strict security measures forbid users from installing third-party applications directly, including FMWhatsApp, which are not offered on the App Store.
While Android users are able to check the box for "Unknown Sources" and install APK files, iOS deploys the same functionality using IPA files. Besides that, there is no such setting that would allow the installation of third-party apps. In this case, iOS relies on a closed garden to ensure every app is security-vetted and that users are not installing unauthorized software on the devices. The only way around this limitation on iOS is by jailbreaking the device. However, jailbreaking increases malware risks by up to 50 percent, according to a report from Mobile Security Insights, because this breaks Apple's built-in protections and exposes the device to vulnerabilities.
This is usually very unreliable and hazardous, even though some web sources promise to provide ways for installing FMWhatsApp on iOS. According to a report by Tech Security Today in 2023, over 70% of unofficial iOS-source applications have vulnerabilities in critical activity leading to data breaches or malware. Generally speaking, downloading from such unverified platforms compromises user data and thus is discouraged for users who value device security.
For the same set of features, iOS users may want to check WhatsApp++ or WhatsApp Aero. The former variety sometimes exists but also requires jailbreaking. Although those variants would offer the same feature set as FMWhatsApp, they are also equally prone to risks of their own and even must be reinstalled regularly since the iOS updates tend to disable them.
But in the end, even though there is no direct fmwhatsapp download for iOS, it is safer for its users to remain with the conventional WhatsApp or seek other alternatives that are approved on the App Store. It is just the nature of the restrictions that Apple has imposed to save user information and device integrity that makes these beneficial for the users who are genuinely concerned about security and privacy.