DreamTone is a free sleep sound app that lets you MIX multiple sounds together — not just pick one loop. Why mixing matters: your brain adapts to a single sound fast, but layering 2–5 sounds creates a richer soundscape that lasts all night. 38 sounds across rain, noise, ocean, fire, nature, urban, meditation & binaural beats. Includes 19 presets, sleep tracking, smart alarm, sleep cycle calculator, offline mode, 7 languages, no account/data collection, and no $70/year paywall.

Hey Product Hunt, I'm a solo dev who built DreamTone because I got fed up paying $70/year just for rain sounds (yeah, Calm, I'm looking at you). Quick background on how it got here: • v1.0 (April): MVP with 13 sounds, shipped in 4 days • v1.1: Tripled content to 38 sounds + 19 presets • v1.4: Added sleep tracking, smart alarm, full sleep timeline • v1.5 (current): Polished the alarm system, squashed bugs A few technical bits if you're curious: — All 5 noise colors (white/pink/brown/blue/gray) are synthesized in real-time with AVAudioEngine. No audio files, just math. — Binaural beats run dual oscillators with configurable frequency offsets (Delta 0.5-4Hz for deep sleep, Gamma 40Hz for focus). — The sleep timeline auto-transitions between phases: Wind Down > Fall Asleep > Deep Sleep > Wake Up. Coming soon: • Breathing exercises (4-7-8 and box breathing) • Apple Watch companion • Siri Shortcuts Business model is simple: free with non-intrusive ads. I think sleep sounds should be accessible to everyone, not gated behind a subscription paywall. Curious to hear — what sounds actually help you fall asleep?