A lot of these web tools are popping up like mushrooms on the internet lately. They're mostly built on top of GPT-.

- JasperAI (Formerly Jarvis)

- Rytr.me

- Copy.Ai

etc.

They're all powerful but comes with a hefty price tag IMO. The best and cheapest alternative that I know is OpenAI's Playground. It's still in beta but a far cheaper option and just as capable as the others.