

You don’t strictly need a huge GPU. These days, there are a lot of places for free generations (like the AI Horde), and a lot of quantization/optimization that gets things running on small VRAM pools if you know where to look. Renting GPUs on vast.ai is pretty cheap.
Also, I’d recommend languagetool as a locally runnable (and AI free/CPU only) grammar checker. It’s pretty good!
As for online services, honestly Gemini Pro via the AI Studio web app is way better and way more generous than ChatGPT, or pretty much anything else. It can ingest an entire story for context, and stay coherent. I don’t like using Google, but if I’m not paying them a dime…
Reasonable! And yes languagetool has some online AI thing, probably a junky wrapper around an LLM API TBH.
One thing I’d be wary of is… well, showing you’re using AI?
As a random example, I helped clean up a TV show a long time ago, with mixed results. More recently, I brought the idea of making another attempt to the fandom, and got banned for even considering “AI,” with most of them clearly oblivious to how the original restoration was made… I have a little personal writing project going too, and wouldn’t dare bring it up to the fandom either.
I don’t know what’s involved in your project, but be aware that you may get some very hostile interaction if it’s apparent you use diffusion models and LLMs as helpers.