Until it becomes common it might be a problem of marit ayin. However, I do not see the difference between a tefilla app and a siddur. In fact, the former has an advantage as that portions such as “yaaleh v’yavo” come up on the proper days so that it is more difficult to forget. In addition, shul siddurim are often worn out and even have pages missing. I did read an article by someone who lies the smell of old siddurim but I suppose that a smell app can be added.
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