Free AI for Everyone — 无需登录、完全免费的 AI（模型包括 Grok 4 Fast、DeepSeek V3.1 等）。可选择的模型以后可能会有所调整，但这个服务会长期提供，并且完全免费

u/Key_Caramel_5578 · Reddit

Built a free PDF toolkit solo (with AI help) — need feedback on the in-browser text editor before I keep pushing on it Been heads-down on this for a while: thepdftool.in Standard PDF stuff : merge, split, compress, convert, OCR — but most of the conversion tools run entirely client-side (WASM), so files never leave your browser for those. Built solo, leaned on AI tools for a good chunk of the code and debugging. The feature I care most about right now is an inline text editor :— click i

Web AI助手 — 极简、免费、易用的 ChatGPT。无需注册，Email 接码登录，GPT-4o-mini 模型免费使用，支持 GPT-4o 模型，支持实时联网