Just give the page to chatgpt and ask what they use. Give them as much info as you can.

I have tried that but 1) it hallucinated a lot of technologies as I mentioned and 2) it only detects the front end stuff not backend

	▲	AznHisoka 2 hours ago \| parent [-]
		See the reply up above. You can't just expect LLMs to give you good answers if you're not providing lots of context to it. Also, make sure you give it guardrails. Like say you can't only infer it from the JS scripts on their website, external AJAX calls, job postings posted directly on their website, their Github profile, and engineering blog... Otherwise you're gonna get lots of made up stuff :)