Yesterday I ran into a discussion with my coworkers because after setting our app high fidelity prototype to a real user testing, we noticed that they barely saw the top nav action button which we consider is one of the most important interactions in our app:
Here are the 3 comparisons:
Button-like (the one we put for testing):
My hypothesis with the button-like action is that the user first sees a rounded rectangle, then notices that there is text inside and later he/she reads what the text actually says. My coworkers said that is not possible, It is obviously a notorious button.
Is there any research that would help me support my hypothesis?
It would be helpful to have suggestions for improving the button-like action in case we need to leave it that way.
NOTE: The icon-like option is the last option we would like to take for we have some view-actions that can be difficult to represent with icons.
UPDATE: I am asking this question because a 100% of the users who tested the app didn't see the button at a first glance when they were asked to "post something".
UPDATE 2: According to @Majo0od suggestions, I came up with a third design that is going to be tested:
This 4th prototype incorporates bolder text + icon. The reason why we choose to have the action button there is because the client is requesting us to have its logo there, always visible.