ClickFunnels

This is the software that I have used since I started. It is user-friendly, and it has a great support center. If you are stuck or have an issue, create a chat, and they can help you right away. This software is $97 a month. It is not as cheap as we would love at first, but it was designed primarily with an affiliate marketer in mind, so the value is worth it.

Systeme.ios

This is an all-in-one solution. You have everything on one platform. No need to get other tools for competitive prices is a great option when starting. It has a Free version. You can use it at first and then upgrade as you need. Another great option is that it is super easy to use and has much training that can help you if you get stuck.

Aweber

This is the software I use is entirely free for up to 500 subscribers. If you need more, they charge $19 to go pro.

GetRespond

This is the software with multiple options of payments, starting with a Free version and moving up the price to $13 depending on the number of contacts.