Pure Phase
Breathe. Focus. Calm. Sleep.
Free · Designed for iPad. Not verified for macOS.
Free. No subscription. Synchronized light, sound, and breath for focus, calm, sleep — and now DRIFT.
Pure Phase uses synchronized light, sound, and breath to guide you into focused, calm, or sleep states — without subscriptions, accounts, narration, or bloat.
Tap to begin. Hold to tune. That's the whole interface.
THREE SCIENCE-GROUNDED STATES
FOCUS — 40Hz gamma frequency, synchronized light and isochronic audio. Associated with peak mental clarity. The subject of ongoing clinical research at MIT and elsewhere.
CALM — 10Hz alpha frequency. One of the most consistently documented frequencies in relaxation and stress research. Ideal for unwinding, creative work, or transition between tasks.
SLEEP — 2Hz delta frequency. Use with eyes closed and torch enabled. The flashlight pulses at the session frequency through your eyelids — no screen required.
BREATHE — GUIDED BREATHWORK
A fourth mode with no flicker — just a breathing ring that expands and contracts to pace your breath. Choose from Coherence (6 breaths per minute, the HRV resonance frequency), 4-7-8, Box breathing, or Slow Wave. Or build your own pattern in Advanced settings.
ISOCHRONIC AUDIO
A warm audible carrier tone pulses at the brainwave frequency, synchronized frame-by-frame with the visual flicker. Underneath, a procedurally generated ambient texture — pink noise, brown noise, or sustained drone — provides continuity and masks environmental sound. Everything is generated on-device. No audio files.
DRIFT & BLOOM
New psychoacoustic modes for headphones. Three synthesis layers create auditory depth and slow movement through pure tones — a breathing carrier, a drifting stereo field, and optional harmonic shimmer. DRIFT pairs them with a pure black canvas. BLOOM pairs them with a slow generative visual field that breathes and shifts color in sync with the audio. Non-stroboscopic — accessible to anyone who can't tolerate the entrainment modes.
ADVANCED
For users who know what they want: Theta, SMR, PRISM, and Void states, a custom Hz slider from 0.5 to 40Hz, custom breath timing with independent inhale, hold, and exhale controls, and carrier frequency selection. Clearly labeled as exploratory.
PURE PHASE IS FREE
No subscription. No account. No guided narration. No content library. No streak tracking. No ads. No data collection of any kind. Everything runs on your device.
Pure Phase uses rapid rhythmic light pulses. Do not use if you are photosensitive or have a history of epilepsy or seizure disorders. Always use in a safe, seated, stationary environment. Not a medical device.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
DRIFT — a new audio-only mode for headphones. Three psychoacoustic layers synthesize slow movement and depth from pure tones.
BLOOM — DRIFT plus slow generative visuals. The screen breathes with the audio.
Apple TV support. The full experience on a large screen.
Plus the existing safety acknowledgement now mentions bystanders. The flicker fills the room when projected.
The developer, Mark Friedlander, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Mark Friedlander
- Size
- 4.1 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple TV
Requires tvOS 17.0 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- Contains
Health or Wellness Topics
- Copyright
- © 2026 Mark Friedlander