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Sine Wave A 440 Hz Concert Pitch for Ten Hours
Stop your brain from overthinking. You don't need an app. Ten hour Sine wave with no overtones which is called pure as it is only the fundamental frequency.
Youtube
The embroiderers at the Sankalan embroidery design and production house in Jaipur, Rajasthan, practise a variety of stitch techniques to embellish fabrics by hand. The V&A followed their work on a lehnga, a wedding skirt, from traced outline to finished product. Only by slowing the footage could the incredibly fast stitching of ari embroidery be captured, as professionals perform it so rapidly it is nearly impossible to see with the naked eye.