Show HN: Created a brain entrainment app – didn't expect growth

Sleep better, focus deeper, and unwind with binaural beats and ambient sounds. Customize sessions and explore a rich sound library — even offline.

Shimmr: Binaural Beats for Sleep, Focus & Relaxation

Sleep better. Focus deeper. Relax easier.

Shimmr offers expertly crafted binaural beats, isochronic tones, ambient soundscapes, and nature sounds — all designed by audio professionals to support your wellness.

Why Shimmr?
• Works offline – no internet needed and no data used
• Created by expert audio engineers
• Fully customizable sessions (EQ, volume, reverb)
• Clean, focus-friendly interface
• Timer from minutes to 24 hours
• Powerful search & organized library
• Syncs with Apple Health (HealthKit)
• Set daily mindfulness reminders
• Play sounds while using other apps

Feel the Benefits:
• Fall asleep faster, sleep deeper
• Reduce stress & anxiety naturally
• Improve focus, mood & emotional balance
• Soothe tinnitus
• Support meditation & mindfulness

Go Premium:
• Full access to the sound library
• Save and replay your custom mixes
• Unlock advanced sound tools
• Early access to new features

Download Shimmr now — your offline sound companion for better sleep, focus, and calm.

I love this app a lot! I got a free Premium subscription for 6 months from the developer, and I will absolutely be paying to keep it after the fact.

It’s intuitive and easy to use, and it looks very clean too. I like the array of sounds and the fact that I can set a sound to go for as long as I need to. It’s very easy on my battery too so I can leave this on all night if I want.

A couple things I wish this app would have (not necessary and not a detractor, just a personal wishlist hehe) is 1.) the ability to add sounds to a mix (maybe this is already present but I didn’t see a way to do so), for instance if I wanted to listen to binaural beats but add in rain or a thunderstorm over it. 2.) I mostly use this on my iPad and it’s not built for said device; the bottom of the screen is cut off. Not a dealbreaker, just kind of a “huh” thing.

Again though it’s a brilliant app that doesn’t NEED these things, they would just be the cherry atop an already delightful cake :)

Excellent selection of tones that are customizable and well grouped. Intuitive and simple UI too. I’ve been using it daily for a few days and will continue.

There are a few minor bugs here and there, especially in a re-opened app session after it’s sat in the background a while. They can necessitate a relaunch, but idc given how well this app otherwise works.

Hey, I appreciate the review! ☺️

The bug you noticed I have already fixed in the next version which I am finishing off for release. If you find anymore please feel free to let me know.

🥰