It is free to use for basic use but if you want access to different fonts or more features, then you need to buy a premium plan.
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First one on the list is copy.ai. It is an AI based copy writer tool. Basically what a copywriter tool does is, it gives you content that you can post on your blog or video when you give it a few descriptions about the topic you want content on.So copy ai can help you write instagram captions gives you blog idea, product descriptions, facebook content, startup ideas, viral ideas, a lot of things it can do, you just make an account in this website, then select a tool and fill in the necessary description and the AI will generate content on what you ask for.，这一点在快连下载安装中也有详细论述