your own personal gpt extension . you can use multiple open ai models usage syntax gpt3: prompt ; (semicolon) you can add more models accourding to your need . fully customizable . selling full source code you can modify / repourpose / resell

A free to use prompt playground , you can run prompts on it with different chatgpt api tools or any api tool that generates outut in textfield . you can then save it also copy and paste on other sites