A propeller aircraft passing overhead drags its engine tones down in pitch. The shape of that Doppler curve depends on the aircraft's speed and on where the microphone was. adoppler finds these curves ...

这是独立于 Streamlit v10 的新项目。前端使用 Next.js/React，可部署到 Vercel；Supabase 只保存数据库记录、登录帐号、OCR 结果和审核记录；原始 PDF 不会上传到 Supabase，也不会建立 Supabase Storage bucket。