FitLLM is a free, accurate local-LLM memory calculator for Apple Silicon. Choose a model, quantization, RAM and context length to see whether it fits in your Mac's unified memory, how much is left, and how fast it runs. It correctly models the sliding-window and hybrid attention used by Gemma 4 and Qwen 3.6 — which naive VRAM calculators get wrong by multiples — and lets you paste any HuggingFace model. 이 LLM, 내 맥북에 들어갈까?
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