Driftdown

Procedurally generated ambient sleep soundscapes.

Brown noise, rain, wind, and thunder — engineered for deep rest.

In Development iOS 16+

What is Driftdown?

Driftdown generates unique sleep soundscapes in real-time using procedural audio synthesis. Every playback session is different — no loops, no repetition. Just endless, evolving ambient sound designed to mask environmental noise and guide you into deep sleep.

Built with a high-performance Rust audio engine and a minimal SwiftUI interface, Driftdown prioritizes battery efficiency and sound quality over unnecessary features.

Features

🌊 Procedural Generation

Real-time audio synthesis means every session is unique. No loops, no repetition — just endless variation.

🎚️ Five Ambient Layers

Brown noise, rain, wind, thunder, and binaural beats mixed dynamically. All layers included in free tier with Deep Sleep mode (2 Hz delta).

⏱️ Smart Timer

Set durations from 5 minutes to 3 hours. Remembers your preference. Auto fade-out when timer expires.

🔋 Battery Efficient

Rust-powered audio core uses minimal CPU. Engineered for all-night playback without draining your battery.

🔒 Privacy First

No accounts, no tracking, no data collection. Runs entirely on your device. Subscription managed through Apple.

🎯 Two Modes

Deep Sleep (Free): 2 Hz delta waves for overnight rest.
Quick Nap (Premium): 5.5 Hz theta waves for power naps.

Built With

Rust

High-performance audio generation core. Real-time synthesis with zero allocations in the audio thread.

Swift + SwiftUI

Native iOS interface. Minimal, focused UI that gets out of your way.

AVAudioEngine

Core Audio integration for low-latency playback, background audio, and Now Playing support.

DSP Libraries

Butterworth filters, binaural beat generation, and modulated noise synthesis using dasp and biquad crates.

Pricing

Free Tier

$0

  • 15 minutes per day
  • Deep Sleep mode (2 Hz delta)
  • All 5 ambient layers
  • Basic timer

Premium

$1.99/month

  • Unlimited playback
  • Quick Nap mode (5.5 Hz theta)
  • Advanced timer controls
  • All future updates

7-day trial for Quick Nap. Subscription managed through Apple. Cancel anytime.

Availability

Currently in development. Not yet available on the App Store.

Driftdown is being built with care — prioritizing quality over speed. We'll announce when it's ready for TestFlight beta testing.

Interested in early access? Get in touch.

Support

Questions about Driftdown? Reach out directly.