No. Apple does not allow third-party app stores for adult content. There is no iOS version, and no workaround exists without jailbreaking (not recommended).
The last stable release was version 5.5.10, released on March 10, 2018. mikandi app store download
Ensuring that the app hasn't been tampered with since the developer signed it. released on March 10
Understanding Third-Party App Marketplaces and Mobile Security mikandi app store download