Binaural Beat is a binaural beat generator for relaxation, focus and sleep. A binaural beat is created by playing two slightly different frequencies, one in each ear. The brain perceives a third "beat" at the difference between them. Use headphones for the effect to work. Features: * Two audio engines: - Simple: a lightweight built-in tone generator with base and beat frequency sliders. - SBaGen: the classic Sequenced Binaural Beat Generator by Jim Peters, with 58 bundled preset sequences (brainwave states, focus levels, chakra progressions and more). * Independent background layer that mixes under the beats, with its own volume: - Pink and brown noise, generated on the fly. - Looping nature samples (river, train). * Clean, modern interface. This is a 2026 revival of an old project: the original was a native Android port of SBaGen via OpenSL ES. This version keeps the genuine SBaGen engine but runs it on a modern stack. Binaural Beat is free software, released under the GNU GPL v2. It builds on SBaGen by Jim Peters (GPLv2). Bundled audio samples are freely licensed (Creative Commons); see the project's CREDITS for full attribution. Note: binaural beats are not a medical treatment. This app is for relaxation and personal experimentation only.