Sialk holds as little personal data as it can. That is the cheapest compliance strategy available and also the honest one, so this page is short.
Last updated: 11 October 2026.
Who is responsible
Sialk is run by SIALK LTD, a company registered in England and Wales, number 17427982, which is the data controller for the purposes of UK GDPR. The company was incorporated on 29 August 2026; before that date the controller was Bashir Zahedi as an individual, and this page said so.
Contact: privacy@sialk.net
This website
Nothing on this site is recorded. There are no analytics, no cookies, no session recording, no tracking pixels, and no third-party scripts other than Paddle's checkout on the two buy pages, named below. You are not asked to identify yourself and nothing asks you to sign in.
The microphone demos process audio entirely in your browser. The inspector and the example sketches read your microphone to draw what they draw. That audio is analysed on your own machine and is never recorded, stored, or transmitted anywhere, not to Sialk, not to anyone. Closing the page ends it. You can verify this: the source is public and the page makes no network requests while running.
Fonts are served from this site itself. Your browser fetches nothing from Google or any other font service, so no one else learns your IP address from them.
Buying Operatour or Playery. The buy pages, /operatour/buy and
/playery/buy, load Paddle's checkout script, and only those pages do. Paddle.com Market Limited is the seller of
record: when you buy, Paddle collects your name, email address, country and
payment details, charges you, issues the receipt and handles the tax. Sialk
never sees your card. Their notice is at https://www.paddle.com/legal/privacy.
To give you your licence key, Sialk's site asks Paddle for that one purchase: its order number, its state, what was bought and your email address. The key is worked out from them on the spot and is not stored; asking again with the same order number and email gives the same key.
Emails we send. When you buy, the site emails you your licence code; when you send feedback, the site emails your message (and the run log, if you attached one) to our own inbox. Both go through Resend, an email service that acts as our processor, from licence@sialk.net. Resend sees the address, the subject and the text of each email it sends, and keeps a record of delivery. Their notice is at https://resend.com/legal/privacy-policy.
Prices in your currency. To show what Operatour and Playery cost where you are, this site's server sends your IP address to Paddle, once per visit, and Paddle answers with the prices in your local currency. Nothing else is sent. Sialk keeps neither the address nor the answer; your browser keeps the answer for that visit only, and it is gone when you close the tab.
Hosting and server logs. This site is hosted by Vercel Inc., a company based in the United States, which acts as a data processor under its Data Processing Addendum. SIALK LTD remains the controller.
Serving a page to you means Vercel receives your IP address, location information derived from it, and basic information about your browser and device, the ordinary consequence of any web request reaching any server. Vercel uses it to deliver the site and to protect it from attack.
Vercel does not publish a fixed retention period for this, stating only that it keeps information "for the minimum necessary period to fulfil our legal and contractual obligations". That is their answer rather than a number, and it is repeated here as such rather than dressed up as one. Their notice is at https://vercel.com/legal/privacy-notice.
No analytics are switched on. Vercel offers Web Analytics and Speed Insights; neither is enabled for this site, so no page views, sessions or performance samples are collected.
Your data leaves the UK. Vercel processes in the United States. Transfers are covered by the standard contractual clauses in their Data Processing Addendum. If that is not acceptable to you, the site can be read without JavaScript and nothing here requires you to identify yourself.
The Operatour application
Operatour holds no account and sends nothing. Every run writes a log to
~/Documents/Sialk/Operatour/logs/ on your own disk: the machine, the GPU, the frame
rate, dropped frames. Nothing about you, your sketches or their content. It
leaves your machine only if you attach it to the feedback form yourself.
Updates. Once a day Operatour asks GitHub, where its builds are published, whether a newer one exists, and downloads it if so. The request carries nothing about you; GitHub sees your IP address, as any website does. Settings, Updates turns the download off, or the asking altogether.
Your work is yours. Sketches, shows and anything made with Operatour belong entirely to you. Operatour does not upload, inspect or store them.
When Operatour is sold, this section will say what changes before it does; any telemetry will be opt-in and off by default.
The Playery application
Playery holds no account and sends nothing. Your licence key is checked
on your own Mac, never over the network. Its run logs stay in
~/Documents/Sialk/Playery/logs/ unless you send one yourself. Once a day
it asks GitHub whether a newer build exists, as Operatour does; Settings,
Updates turns that off.
How long data is kept
For as long as your licence is in use, and then for as long as tax and accounting law requires records of the transaction.
Your rights
You can ask what is held about you, ask for it to be corrected, ask for it to be deleted, and object to how it is used. Write to the address above and you will get an answer within one month.
If you are not satisfied, you can complain to the Information Commissioner's Office at ico.org.uk.
Changes
If this policy changes materially, the change will be described here with the date. The version you agreed to continues to apply to you until you are told otherwise.