I would like to send a text or emoticon to other person with the lowest number of taps, ideally only one. A widget with predefined text to a predefined person would be enough.
Is there any app capable to do this?
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While not the intended use-case, it fits the criteria in your question. Using this app, you first define the phone number and message, then you can send that message using the widget. It requires two taps instead of one in order to reduce the probability of unintentional triggering. It also has the option to send an email and share your GPS location.