AvenChat lets you talk to Gemma 4 directly in your browser at no cost. Alongside the chat, it offers reference pages that compare the different Gemma 4 sizes and explain what hardware each one needs.
If you want to run the model on your own machine, it has step-by-step guides for tools like Ollama and LM Studio. It is a practical starting point for anyone weighing up whether to try, host or compare these open models.