$50/hour. Not because I am incompetent, but because I choose to work from home(more productive, more time with family vs commuting). Most people want you to come to their office for butt-in-seat hours, so I have to lower my rate to still be desirable. Unfortunate, but there's not a ton of full-time remote iOS demand these days
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For reference:
Cheap overseas outsourcing = $20-30/hour
Junior/entry-level contract rate = $50-75/hour
Competent developer (i.e. able to work well without need for help or guidance) = $75-125
Highly skilled professional (flies in to help, recognized industry professional, directs projects architecture) = $150-300