The cost of an Udemy clone app development depends entirely on your wants and customization. Here we list out the pricing of the Udemy clone, such as

Simple app: $10,000 - $40,000
Medium complexity app: $45,000 - $90,000
Complex app: $90,000+

If you are looking to build your own Udemey Clone app then Appticz is the right choice >> https://appticz.com/udemy-clone