The original Demul (often stylized as "DEMUL") is a closed-source emulator for Windows. The developer(s) have never released an Android build, nor have they signaled any intention to do so. If you see a website offering a direct "Demul APK," you should treat it with extreme suspicion. These are frequently malware, ad-ware, or simply rebranded, low-performance emulators trying to cash in on the Demul name.
. It is known for its wide compatibility and is available both as a standalone app and a RetroArch core demul emulator android