The best alternatives to AceScreen are Replica, Lumen, and Shorticons. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Mirror your iPhone and iPad screen on a web browser with Replica and bring your favorite iOS apps to Mac, Windows or Linux. To celebrate this launch, the screen mirror to a web browser will be free for a limited period of time!