In string theory, one of the many vibrational states of the string corresponds to the graviton, a quantum mechanical particle that carries gravitational force. Thus string theory is a theory of quantum gravity.
Their average web application development cost is around $500K and their staff or contractors' salary is in the six figure plus range. Their proposals are usually based on a lot of fluff with the development rate ranging from $400 - $800 per hour. These types of companies focus on custom development.
I worked at a few mobile app development companies where we built apps for our clients and if you can believe it, charged anywhere from $150-$200/hour. Itâs safe to say that for an individual with an app idea, this option is difficult to pursue unless you have really deep pockets!