Tzomet published a piece about Shabbos App that it desecrates the spirit of Shabbos, yet, they make a microphone to be used in shuls on Shabbos! Look at what they say

As is true of many modern devices, there is no fear of the appearance of Shabbat desecration, since “everybody knows that the system was set up in advance” (RAMA, Shulchan Aruch Orach Chaim 252:5). Once these systems are in common use, they will be no different from air conditioners or lights that are operated on a timer, which are commonly accepted without fears of mar’it ayin or avsha milta. A sign is prominently displayed stating that the system has been approved by The Zomet Institute, with appropriate explanations and operating instructions.

With respect to the “Reform image,” we are not involved in such questions. Once the matter becomes commonplace in all synagogues, the image will change.

At Shabbos App,we’re not looking to change the halacha, just make people aware what the real halacha is! You can read about tzomet’s Shabbos Micropone here