ChatGPT-web is a simple single-page web interface for the OpenAI ChatGPT API. You need to register an OpenAI API key to use it. OpenAI charges per token (based on usage), which means it's significantly cheaper than ChatGPT Plus unless you use over 10 million tokens per month. All messages are stored in the browser's local storage, so everything is private. You can also close the browser tab and come back later to continue the conversation. As an alternative to OpenAI, you can also use Petals swarm as a free API option for open-source chat models like Llama 2.