About
.shush is a next-generation noise and sleep wellness app for iPhone and iPad that takes a fundamentally different approach from traditional white noise apps. Rather than blasting full-spectrum audio regardless of your environment, .shush first listens to your room — detecting HVAC hum, traffic, fans, and appliances — and then generates only the frequencies that are missing. The result is effective sound masking at significantly lower volume, which research shows is better for sleep quality. All four noise types (brown, pink, green, and white) are synthesized in real time using Apple's vDSP Accelerate professional audio framework, meaning every moment is mathematically unique with no loops, no recordings, and no repeat points your brain can latch onto. A research-backed smart sleep timer gently fades sound and stops it entirely, protecting up to 19 minutes of REM sleep that continuous noise would otherwise cost you. For tinnitus sufferers, .shush includes a clinical notch therapy tool that lets you match your tinnitus pitch independently for each ear and set a custom filter width — removing those exact frequencies from the noise signal. The app also includes guided breathing exercises (4-7-8, box, calm, relax) and automatically adapts its audio output to your iPhone speakers, headphones, or Bluetooth device. It contains no ads and is designed for sleep, focus, tinnitus relief, baby sleep, travel, and relaxation.
Key Features
- Room Acoustic Analysis: Listens to your space, identifies existing frequencies (HVAC, traffic, fans), and only generates what's missing — achieving full coverage at lower, safer volume.
- Real-Time Noise Synthesis: All four noise types (brown, pink, green, white) are synthesized live using Apple's vDSP Accelerate framework — mathematically unique every moment, never looped.
- Smart Sleep Timer with REM Protection: Research-backed timer gently fades sound and stops playback so your brain can enter REM sleep uninterrupted, recovering up to 19 minutes of lost REM per night.
- Clinical Tinnitus Notch Therapy: Match your tinnitus pitch for each ear independently and set a custom filter width; the app removes those frequencies from the noise based on clinical research.
- Guided Breathing & Device Adaptation: Includes 4-7-8, box, calm, and relax breathing exercises, and automatically optimizes audio output for iPhone speakers, headphones, or Bluetooth devices.
Use Cases
- Falling asleep faster using low-level broadband noise that fades out automatically to protect REM sleep cycles.
- Blocking distractions and entering a deep focus state during work or study sessions.
- Managing tinnitus symptoms with per-ear clinical notch therapy calibrated to your specific tinnitus frequency.
- Helping infants sleep at lower, safer volume levels compared to traditional white noise machines.
- Winding down with guided breathing exercises (4-7-8, box breathing) paired with gentle noise while traveling or in unfamiliar hotel rooms.
Pros
- Science-Backed Design: Features are grounded in published sleep and tinnitus research, including REM protection and notched sound therapy, not just marketing claims.
- Lower Volume by Design: Room analysis means you need less volume to achieve the same masking effect, which is healthier for hearing and sleep quality.
- No Ads, No Loops, No Recordings: Clean, distraction-free experience with mathematically generated audio — your brain can never detect a pattern or loop point.
- Highly Adaptive: Automatically adjusts output for different listening devices and room environments, making it useful at home, in hotels, or while traveling.
Cons
- iOS Only: Currently available only on iPhone and iPad; Android users and desktop users have no access to the app.
- Limited Reviews & Track Record: As a relatively new app (launched early 2025), it has few public ratings, making it harder to gauge long-term reliability and effectiveness.
- In-App Purchases Required for Full Access: The free tier may have limited features; unlocking the full suite of noise types, tinnitus tools, and breathing exercises may require payment.
Frequently Asked Questions
How is .shush different from other white noise apps?
.shush analyzes your room's existing acoustic environment and only generates frequencies that are missing, achieving effective noise masking at lower volume. Most apps generate the same full broadband signal regardless of your surroundings, forcing you to turn up the volume — which research shows harms sleep quality.
Does .shush really help with tinnitus?
Yes. .shush includes a clinical notch therapy tool based on published research. You match your tinnitus pitch for each ear independently, and the app removes those exact frequencies from the noise signal. It is a genuine therapeutic tool, not a preset or gimmick.
Why does the sound stop on its own?
The smart sleep timer is intentional. Research shows that continuous noise throughout the night can reduce REM sleep by up to 19 minutes. .shush helps you fall asleep, then gently fades and stops so your brain can rest properly.
Is .shush safe to use for babies?
Yes. Because .shush operates at lower volume by design (using room analysis to compensate), it aligns with AAP (American Academy of Pediatrics) safe volume guidelines for infant sleep environments.
Is .shush free to use?
.shush is free to download with in-app purchases available for full feature access. The app contains no ads.
