Sazameki is a work by senneroflove, published by Nodera LLC,
in Tokyo, Japan.
Sazameki asks for no account, no name and no email. It listens to the music in the room and
turns it into light on your screen. This page says exactly what that involves.
The microphone
With your permission, Sazameki listens through the microphone to find the beat and the loudness
of the music around you. That listening happens on your device, a fraction of a second at a
time. The sound is never recorded, never saved and never sent anywhere. If you refuse the
microphone, Sazameki plays its own tones instead and does not ask again; you can change this later
in the iOS Settings app.
What goes over the network
To follow the room's scene and colours, the app keeps a connection open to our server at
resona.nodera.tokyo, and receives on it the scene, the colours and the tempo the
host of the room has chosen. The app uploads no microphone audio, no analytics and no account or
profile data. Connecting necessarily tells the server the name of the room you joined and, like
any connection over the internet, your device's IP address; the server uses them to deliver the
room and does not keep the IP address.
What the server keeps
- An operating log. When a device connects or leaves, the server writes a
line with the time, the room name and how many devices are in the room. It holds no IP address
and nothing that tells one device from another. We keep it to run and repair the service, for
about two weeks; after that it is deleted automatically.
- No request logs. The web server in front of Sazameki keeps no log of the
requests it serves for this site, and no error log either.
- Room settings. For each room, the scene, colours and tempo its host last
chose, and a scrambled fingerprint of the host's key (never the key itself). None of this is
about the people watching.
We do not combine the log with anything else and do not share or sell it.
Until 10 October 2026 the logs also held IP addresses and the web server logged
each request. Those older logs have since been deleted.
Purchases
One scene, Nagare, is available as a one-time purchase. Apple handles the payment through the
App Store; Sazameki never sees your card or your Apple Account. To know whether you own it, the
app asks the App Store on your device, and tells our server nothing about it. Apple provides
Nodera LLC with sales and financial reports, including aggregated information about purchases,
refunds, dates and regions. These reports do not identify individual purchasers by name or
Apple Account.
What is stored on your device
Your own settings, in the app's preferences: the server and room to follow, whether the
controls stay hidden, the beat detector's tuning, whether you last used the microphone or the
built-in tones, and that you have read the flashing-lights notice. They stay on your device and
go when you delete the app. Whether they appear in your device backup follows your own iCloud
and backup settings. Purchases are managed by Apple through the App Store, not stored by
Sazameki, and are not deleted when you remove the app.
The web page
Opening a room link without the app shows a simpler version in your browser. It works the
same way: the browser asks for the microphone, listens in the page, and records and sends
nothing. The room host's console keeps the host's key in the part of the address that browsers
never send to a server.
What is not collected
No analytics. No advertising and no advertising identifier. No crash or performance
reporting of its own. No third-party SDKs. No location, contacts or photos.
One thing does not come from Sazameki: if you have turned on iOS's own Share
with App Developers setting, Apple may pass us crash logs from the apps you use, this one
included. That is Apple's mechanism and your setting.
Deleting
To remove your settings, delete the app. The server keeps nothing that identifies you, so
there is nothing of yours on it to delete; the operating log deletes itself after about two
weeks.
Children
Sazameki collects nothing meant to identify anyone, of any age.
Governing law
This policy is governed by the laws of Japan.
Changes
If a future version of Sazameki handles anything more, this page will say so before that
version ships, and the date below will change.
Contact